diff --git a/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/CMakeLists.txt b/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/CMakeLists.txt
index 5a644c12fe1..c60770f9811 100644
--- a/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/CMakeLists.txt
@@ -5,6 +5,9 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_ead_css_sample_data)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 target_sources(app PRIVATE
         src/main.c
         src/common.c
diff --git a/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/central.c b/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/central.c
index ee2fa5d3da8..9a5d699806b 100644
--- a/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/central.c
+++ b/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/central.c
@@ -2,6 +2,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include "babblekit/testcase.h"
 #include "common.h"
 
 extern const struct test_sample_data *sample_data;
@@ -19,9 +20,8 @@ static bool data_parse_cb(struct bt_data *data, void *user_data)
 		if (decrypted_data_size != sample_data->size_ad_data) {
 			LOG_ERR("Size of decrypted data: %d", decrypted_data_size);
 			LOG_ERR("Size of sample data: %d", sample_data->size_ad_data);
-			FAIL("Computed size of data does not match the size of the data from the "
-			     "sample. (data set %d)\n",
-			     data_set);
+			TEST_FAIL("Computed size of data does not match the size of the data from "
+				  "the sample. (data set %d)", data_set);
 		}
 
 		if (memcmp(sample_data->randomizer_little_endian, data->data,
@@ -31,7 +31,7 @@ static bool data_parse_cb(struct bt_data *data, void *user_data)
 			LOG_ERR("Expected Randomizer from sample: %s",
 				bt_hex(sample_data->randomizer_little_endian,
 				       BT_EAD_RANDOMIZER_SIZE));
-			FAIL("Received Randomizer does not match the expected one.\n");
+			TEST_FAIL("Received Randomizer does not match the expected one.");
 		}
 
 		net_buf_simple_init_with_data(&decrypted_buf, decrypted_payload,
@@ -40,22 +40,21 @@ static bool data_parse_cb(struct bt_data *data, void *user_data)
 		err = bt_ead_decrypt(sample_data->session_key, sample_data->iv, data->data,
 				     data->data_len, decrypted_buf.data);
 		if (err != 0) {
-			FAIL("Error during decryption.\n");
+			TEST_FAIL("Error during decryption.");
 		} else if (memcmp(decrypted_buf.data, sample_data->ad_data, decrypted_data_size)) {
 			LOG_HEXDUMP_ERR(decrypted_buf.data, decrypted_data_size,
 					"Decrypted data from bt_ead_decrypt:");
 			LOG_HEXDUMP_ERR(sample_data->ad_data, sample_data->size_ad_data,
 					"Expected data from sample:");
-			FAIL("Decrypted AD data does not match expected sample data. (data set "
-			     "%d)\n",
-			     data_set);
+			TEST_FAIL("Decrypted AD data does not match expected sample data. (data set"
+				  " %d)", data_set);
 		}
 
 		LOG_HEXDUMP_DBG(decrypted_buf.data, decrypted_data_size, "Raw decrypted data: ");
 
 		bt_data_parse(&decrypted_buf, &data_parse_cb, NULL);
 
-		PASS("Central test passed. (data set %d)\n", data_set);
+		TEST_PASS("Central test passed. (data set %d)", data_set);
 
 		return false;
 	}
@@ -86,7 +85,7 @@ static void start_scan(void)
 
 	err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
 	if (err) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 	}
 
 	LOG_DBG("Scanning successfully started");
@@ -100,7 +99,7 @@ void test_central(void)
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 	}
 
 	LOG_DBG("Bluetooth initialized");
diff --git a/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/common.h b/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/common.h
index 91a5ff325bb..96769b64b57 100644
--- a/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/common.h
+++ b/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/common.h
@@ -46,29 +46,6 @@ int bt_test_ead_encrypt(const uint8_t session_key[BT_EAD_KEY_SIZE],
 			const uint8_t randomizer[BT_EAD_RANDOMIZER_SIZE], const uint8_t *payload,
 			size_t payload_size, uint8_t *encrypted_payload);
 
-#define FAIL(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Failed;                                                               \
-		bs_trace_error_time_line(__VA_ARGS__);                                             \
-	} while (0)
-
-#define PASS(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Passed;                                                               \
-		bs_trace_info_time(1, __VA_ARGS__);                                                \
-	} while (0)
-
-extern enum bst_result_t bst_result;
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t) false
-#define SET_FLAG(flag)	  (void)atomic_set(&flag, (atomic_t) true)
-#define GET_FLAG(flag)	  (bool)atomic_get(&flag)
-#define UNSET_FLAG(flag)  (void)atomic_set(&flag, (atomic_t) false)
-#define WAIT_FOR_FLAG(flag)                                                                        \
-	while (!(bool)atomic_get(&flag)) {                                                         \
-		(void)k_sleep(K_MSEC(1));                                                          \
-	}
-
 LOG_MODULE_DECLARE(bt_bsim_ead_sample_data, CONFIG_BT_EAD_LOG_LEVEL);
 
 struct test_sample_data {
diff --git a/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/main.c b/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/main.c
index cb9925179d6..9175d9d82b3 100644
--- a/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/main.c
+++ b/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/main.c
@@ -2,51 +2,25 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include "bs_types.h"
-#include "bs_tracing.h"
 #include "bstests.h"
 
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(bt_bsim_ead_sample_data, CONFIG_BT_EAD_LOG_LEVEL);
 
-extern enum bst_result_t bst_result;
-
-#define WAIT_TIME_S 20
-#define WAIT_TIME   (WAIT_TIME_S * 1e6)
-
 extern void test_central(void);
 extern void test_peripheral(void);
 extern void test_args_parse(int argc, char *argv[]);
 
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		bst_result = Failed;
-		bs_trace_error_time_line("Test failed (not passed after %d seconds)\n",
-					 WAIT_TIME_S);
-	}
-}
-
-static void test_ead_sample_data_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-	bst_result = In_progress;
-}
-
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "central",
 		.test_descr = "Central device",
-		.test_pre_init_f = test_ead_sample_data_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_central,
 		.test_args_f = test_args_parse,
 	},
 	{
 		.test_id = "peripheral",
 		.test_descr = "Peripheral device",
-		.test_pre_init_f = test_ead_sample_data_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_peripheral,
 		.test_args_f = test_args_parse,
 	},
diff --git a/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/peripheral.c b/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/peripheral.c
index 41362a54789..f6dc1418bce 100644
--- a/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/peripheral.c
+++ b/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/src/peripheral.c
@@ -2,6 +2,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include "babblekit/testcase.h"
 #include "common.h"
 
 extern const struct test_sample_data *sample_data;
@@ -25,7 +26,7 @@ static void create_adv(struct bt_le_ext_adv **adv)
 
 	err = bt_le_ext_adv_create(&params, NULL, adv);
 	if (err) {
-		FAIL("Failed to create advertiser (%d)\n", err);
+		TEST_FAIL("Failed to create advertiser (%d)", err);
 	}
 }
 
@@ -42,7 +43,7 @@ static void start_adv(struct bt_le_ext_adv *adv)
 
 	err = bt_le_ext_adv_start(adv, &start_params);
 	if (err) {
-		FAIL("Failed to start advertiser (%d)\n", err);
+		TEST_FAIL("Failed to start advertiser (%d)", err);
 	}
 
 	LOG_DBG("Advertiser started");
@@ -60,23 +61,21 @@ static void set_ad_data(struct bt_le_ext_adv *adv)
 	if (size_ead != sample_data->size_ead) {
 		LOG_ERR("Size of ead: %zu\n", size_ead);
 		LOG_ERR("Size of sample_ead: %zu", sample_data->size_ead);
-		FAIL("Computed size of encrypted data does not match the size of the encrypted "
-		     "data from the sample. (data set %d)\n",
-		     data_set);
+		TEST_FAIL("Computed size of encrypted data does not match the size of the encrypted"
+			  " data from the sample. (data set %d)", data_set);
 	}
 
 	err = bt_test_ead_encrypt(sample_data->session_key, sample_data->iv,
 				  sample_data->randomizer_little_endian, sample_data->ad_data,
 				  size_ad_data, ead);
 	if (err != 0) {
-		FAIL("Error during encryption.\n");
+		TEST_FAIL("Error during encryption.");
 	} else if (memcmp(ead, sample_data->ead, sample_data->size_ead) != 0) {
 		LOG_HEXDUMP_ERR(ead, size_ead, "Encrypted data from bt_ead_encrypt:");
 		LOG_HEXDUMP_ERR(sample_data->ead, sample_data->size_ead,
 				"Encrypted data from sample:");
-		FAIL("Encrypted AD data does not match the ones provided in the sample. (data set "
-		     "%d)\n",
-		     data_set);
+		TEST_FAIL("Encrypted AD data does not match the ones provided in the sample. (data"
+			  " set %d)", data_set);
 	}
 
 	LOG_HEXDUMP_DBG(ead, size_ead, "Encrypted data:");
@@ -87,10 +86,10 @@ static void set_ad_data(struct bt_le_ext_adv *adv)
 
 	err = bt_le_ext_adv_set_data(adv, &ead_struct, 1, NULL, 0);
 	if (err) {
-		FAIL("Failed to set advertising data (%d)\n", err);
+		TEST_FAIL("Failed to set advertising data (%d)", err);
 	}
 
-	PASS("Peripheral test passed. (data set %d)\n", data_set);
+	TEST_PASS("Peripheral test passed. (data set %d)", data_set);
 }
 
 void test_peripheral(void)
@@ -102,7 +101,7 @@ void test_peripheral(void)
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 	}
 
 	LOG_DBG("Bluetooth initialized");
diff --git a/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/test_scripts/run_tests.sh b/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/test_scripts/run_tests.sh
index 0ac5936aaa3..4bde3f3f740 100755
--- a/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/test_scripts/run_tests.sh
+++ b/tests/bsim/bluetooth/host/adv/encrypted/css_sample_data/test_scripts/run_tests.sh
@@ -21,7 +21,7 @@ Execute ./"$test_exe" \
     -RealEncryption=1 -argstest data-set="${data_set}"
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s="${simulation_id}_${data_set}" \
-    -D=2 -sim_length=60e6 $@
+    -D=2 -sim_length=20e6 $@
 
 wait_for_background_jobs
 
@@ -36,6 +36,6 @@ Execute ./"$test_exe" \
     -RealEncryption=1 -argstest data-set="${data_set}"
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s="${simulation_id}_${data_set}" \
-    -D=2 -sim_length=60e6 $@
+    -D=2 -sim_length=20e6 $@
 
 wait_for_background_jobs
diff --git a/tests/bsim/bluetooth/host/adv/extended/CMakeLists.txt b/tests/bsim/bluetooth/host/adv/extended/CMakeLists.txt
index 1eeaba1207e..0ad660d9958 100644
--- a/tests/bsim/bluetooth/host/adv/extended/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/adv/extended/CMakeLists.txt
@@ -6,10 +6,8 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_ext_adv)
 
-target_sources(app PRIVATE
-    src/common.c
-)
-
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
 
 target_sources_ifdef(CONFIG_BT_CENTRAL app PRIVATE
     src/ext_adv_scanner.c
diff --git a/tests/bsim/bluetooth/host/adv/extended/src/common.c b/tests/bsim/bluetooth/host/adv/extended/src/common.c
deleted file mode 100644
index 6de9aee1de9..00000000000
--- a/tests/bsim/bluetooth/host/adv/extended/src/common.c
+++ /dev/null
@@ -1,24 +0,0 @@
-/**
- * Copyright (c) 2024 Croxel, Inc.
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <zephyr/kernel.h>
-#include "bstests.h"
-#include "common.h"
-
-extern enum bst_result_t bst_result;
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i seconds)\n", WAIT_SECONDS);
-	}
-}
-
-void test_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-	bst_result = In_progress;
-}
diff --git a/tests/bsim/bluetooth/host/adv/extended/src/common.h b/tests/bsim/bluetooth/host/adv/extended/src/common.h
deleted file mode 100644
index 658613892e1..00000000000
--- a/tests/bsim/bluetooth/host/adv/extended/src/common.h
+++ /dev/null
@@ -1,53 +0,0 @@
-/**
- * Copyright (c) 2024 Croxel, Inc.
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#ifndef ZEPHYR_TEST_BSIM_BT_EXT_ADV_TEST_
-#define ZEPHYR_TEST_BSIM_BT_EXT_ADV_TEST_
-
-#include <zephyr/kernel.h>
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "time_machine.h"
-#include "bstests.h"
-
-#define WAIT_SECONDS 30                         /* seconds */
-#define WAIT_TIME (WAIT_SECONDS * USEC_PER_SEC) /* microseconds*/
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag)	   (void)atomic_set(&flag, (atomic_t) true)
-#define TEST_FLAG(flag)    (atomic_get(&flag) == (atomic_t)true)
-#define UNSET_FLAG(flag)   (void)atomic_set(&flag, (atomic_t) false)
-#define WAIT_FOR_FLAG(flag)                                                                        \
-	while (!(bool)atomic_get(&flag)) {                                                         \
-		(void)k_sleep(K_MSEC(1));                                                          \
-	}
-#define WAIT_FOR_FLAG_UNSET(flag)                                                                  \
-	while ((bool)atomic_get(&flag)) {                                                          \
-		(void)k_sleep(K_MSEC(1));                                                          \
-	}
-#define TAKE_FLAG(flag)                                                                            \
-	while (!(bool)atomic_cas(&flag, true, false)) {                                            \
-		(void)k_sleep(K_MSEC(1));                                                          \
-	}
-
-
-#define FAIL(...) \
-	do { \
-		bst_result = Failed; \
-		bs_trace_error_time_line(__VA_ARGS__); \
-	} while (0)
-
-#define PASS(...) \
-	do { \
-		bst_result = Passed; \
-		bs_trace_info_time(1, "PASSED: " __VA_ARGS__); \
-	} while (0)
-
-void test_tick(bs_time_t HW_device_time);
-void test_init(void);
-
-#endif /* ZEPHYR_TEST_BSIM_BT_EXT_ADV_TEST_ */
diff --git a/tests/bsim/bluetooth/host/adv/extended/src/ext_adv_advertiser.c b/tests/bsim/bluetooth/host/adv/extended/src/ext_adv_advertiser.c
index a146107efa8..492b26b106e 100644
--- a/tests/bsim/bluetooth/host/adv/extended/src/ext_adv_advertiser.c
+++ b/tests/bsim/bluetooth/host/adv/extended/src/ext_adv_advertiser.c
@@ -5,12 +5,8 @@
  */
 #include <zephyr/kernel.h>
 
-#include "common.h"
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "time_machine.h"
-#include "bstests.h"
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 
 #include <zephyr/types.h>
 #include <zephyr/sys/printk.h>
@@ -22,8 +18,8 @@ extern enum bst_result_t bst_result;
 
 static struct bt_conn *g_conn;
 
-CREATE_FLAG(flag_connected);
-CREATE_FLAG(flag_conn_recycled);
+static DEFINE_FLAG(flag_connected);
+static DEFINE_FLAG(flag_conn_recycled);
 
 static void common_init(void)
 {
@@ -32,7 +28,7 @@ static void common_init(void)
 	err = bt_enable(NULL);
 
 	if (err) {
-		FAIL("Bluetooth init failed: %d\n", err);
+		TEST_FAIL("Bluetooth init failed: %d", err);
 		return;
 	}
 	printk("Bluetooth initialized\n");
@@ -103,7 +99,7 @@ static void disconnect_from_target(void)
 
 	err = bt_conn_disconnect(g_conn, BT_HCI_ERR_REMOTE_USER_TERM_CONN);
 	if (err) {
-		FAIL("BT Disconnect failed: %d\n", err);
+		TEST_FAIL("BT Disconnect failed: %d", err);
 		return;
 	}
 }
@@ -115,13 +111,13 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != BT_HCI_ERR_SUCCESS) {
-		FAIL("Failed to connect to %s: %u\n", addr, err);
+		TEST_FAIL("Failed to connect to %s: %u", addr, err);
 		return;
 	}
 
 	printk("Connected to %s\n", addr);
 	if (g_conn != NULL) {
-		FAIL("Attempt to override connection object without clean-up\n");
+		TEST_FAIL("Attempt to override connection object without clean-up");
 		return;
 	}
 	g_conn = bt_conn_ref(conn);
@@ -182,7 +178,7 @@ static void main_ext_adv_advertiser(void)
 
 	ext_adv = NULL;
 
-	PASS("Extended advertiser passed\n");
+	TEST_PASS("Extended advertiser passed");
 }
 
 static void adv_connect_and_disconnect_cycle(void)
@@ -228,7 +224,7 @@ static void main_ext_conn_adv_advertiser(void)
 
 	ext_adv = NULL;
 
-	PASS("Extended advertiser passed\n");
+	TEST_PASS("Extended advertiser passed");
 }
 
 static void main_ext_conn_adv_advertiser_x5(void)
@@ -252,7 +248,7 @@ static void main_ext_conn_adv_advertiser_x5(void)
 	delete_adv_set(ext_adv);
 	ext_adv = NULL;
 
-	PASS("Extended advertiser passed\n");
+	TEST_PASS("Extended advertiser passed");
 }
 
 static const struct bst_test_instance ext_adv_advertiser[] = {
@@ -260,16 +256,12 @@ static const struct bst_test_instance ext_adv_advertiser[] = {
 		.test_id = "ext_adv_advertiser",
 		.test_descr = "Basic extended advertising test. "
 			      "Will just start extended advertising.",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_ext_adv_advertiser
 	},
 	{
 		.test_id = "ext_adv_conn_advertiser",
 		.test_descr = "Basic connectable extended advertising test. "
 			      "Starts extended advertising, and restarts it after disconnecting",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_ext_conn_adv_advertiser
 	},
 	{
@@ -277,8 +269,6 @@ static const struct bst_test_instance ext_adv_advertiser[] = {
 		.test_descr = "Basic connectable extended advertising test. "
 			      "Starts extended advertising, and restarts it after disconnecting, "
 			      "repeated over 5 times",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_ext_conn_adv_advertiser_x5
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/adv/extended/src/ext_adv_scanner.c b/tests/bsim/bluetooth/host/adv/extended/src/ext_adv_scanner.c
index b4cd0691afe..231b344ca0f 100644
--- a/tests/bsim/bluetooth/host/adv/extended/src/ext_adv_scanner.c
+++ b/tests/bsim/bluetooth/host/adv/extended/src/ext_adv_scanner.c
@@ -5,12 +5,8 @@
  */
 #include <zephyr/kernel.h>
 
-#include "common.h"
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "time_machine.h"
-#include "bstests.h"
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 
 #include <zephyr/types.h>
 #include <zephyr/sys/printk.h>
@@ -22,9 +18,9 @@ extern enum bst_result_t bst_result;
 
 static struct bt_conn *g_conn;
 
-CREATE_FLAG(flag_ext_adv_seen);
-CREATE_FLAG(flag_connected);
-CREATE_FLAG(flag_conn_recycled);
+static DEFINE_FLAG(flag_ext_adv_seen);
+static DEFINE_FLAG(flag_connected);
+static DEFINE_FLAG(flag_conn_recycled);
 
 static void connected(struct bt_conn *conn, uint8_t err)
 {
@@ -33,7 +29,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != BT_HCI_ERR_SUCCESS) {
-		FAIL("Failed to connect to %s: %u\n", addr, err);
+		TEST_FAIL("Failed to connect to %s: %u", addr, err);
 		bt_conn_unref(g_conn);
 		g_conn = NULL;
 		return;
@@ -93,21 +89,20 @@ static void scan_recv(const struct bt_le_scan_recv_info *info,
 		SET_FLAG(flag_ext_adv_seen);
 	}
 
-	if (!TEST_FLAG(flag_connected) &&
-	    info->adv_props & BT_GAP_ADV_PROP_CONNECTABLE) {
+	if (!IS_FLAG_SET(flag_connected) && info->adv_props & BT_GAP_ADV_PROP_CONNECTABLE) {
 		int err;
 
 		printk("Stopping scan\n");
 		err = bt_le_scan_stop();
 		if (err) {
-			FAIL("Failed to stop scan: %d", err);
+			TEST_FAIL("Failed to stop scan: %d", err);
 			return;
 		}
 
 		err = bt_conn_le_create(info->addr, BT_CONN_LE_CREATE_CONN,
 					BT_LE_CONN_PARAM_DEFAULT, &g_conn);
 		if (err) {
-			FAIL("Could not connect to peer: %d", err);
+			TEST_FAIL("Could not connect to peer: %d", err);
 			return;
 		}
 	}
@@ -124,7 +119,7 @@ static void common_init(void)
 	err = bt_enable(NULL);
 
 	if (err) {
-		FAIL("Bluetooth init failed: %d\n", err);
+		TEST_FAIL("Bluetooth init failed: %d", err);
 		return;
 	}
 
@@ -141,7 +136,7 @@ static void start_scan(void)
 	printk("Start scanning...");
 	err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, NULL);
 	if (err) {
-		FAIL("Failed to start scan: %d\n", err);
+		TEST_FAIL("Failed to start scan: %d", err);
 		return;
 	}
 	printk("done.\n");
@@ -156,7 +151,7 @@ static void main_ext_adv_scanner(void)
 
 	WAIT_FOR_FLAG(flag_ext_adv_seen);
 
-	PASS("Extended adv scanner passed\n");
+	TEST_PASS("Extended adv scanner passed");
 }
 
 static void scan_connect_and_disconnect_cycle(void)
@@ -191,7 +186,7 @@ static void main_ext_adv_conn_scanner(void)
 	printk("Waiting to extended advertisements (again)...\n");
 	WAIT_FOR_FLAG(flag_ext_adv_seen);
 
-	PASS("Extended adv scanner passed\n");
+	TEST_PASS("Extended adv scanner passed");
 }
 
 static void main_ext_adv_conn_scanner_x5(void)
@@ -207,7 +202,7 @@ static void main_ext_adv_conn_scanner_x5(void)
 	printk("Waiting to extended advertisements (again)...\n");
 	WAIT_FOR_FLAG(flag_ext_adv_seen);
 
-	PASS("Extended adv scanner x5 passed\n");
+	TEST_PASS("Extended adv scanner x5 passed");
 }
 
 static const struct bst_test_instance ext_adv_scanner[] = {
@@ -215,8 +210,6 @@ static const struct bst_test_instance ext_adv_scanner[] = {
 		.test_id = "ext_adv_scanner",
 		.test_descr = "Basic extended advertising scanning test. "
 			      "Will just scan an extended advertiser.",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_ext_adv_scanner
 	},
 	{
@@ -224,8 +217,6 @@ static const struct bst_test_instance ext_adv_scanner[] = {
 		.test_descr = "Basic extended advertising scanning test. "
 			      "Will scan an extended advertiser, connect "
 			      "and verify it's detected after disconnection",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_ext_adv_conn_scanner
 	},
 	{
@@ -234,8 +225,6 @@ static const struct bst_test_instance ext_adv_scanner[] = {
 			      "Will scan an extended advertiser, connect "
 			      "and verify it's detected after disconnection,"
 			      "repeated over 5 times",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_ext_adv_conn_scanner_x5
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/adv/periodic/CMakeLists.txt b/tests/bsim/bluetooth/host/adv/periodic/CMakeLists.txt
index 85b2a61c9db..525996ebd94 100644
--- a/tests/bsim/bluetooth/host/adv/periodic/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/adv/periodic/CMakeLists.txt
@@ -5,6 +5,9 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_audio)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 target_sources(app PRIVATE
     src/common.c
     src/main.c
diff --git a/tests/bsim/bluetooth/host/adv/periodic/src/common.c b/tests/bsim/bluetooth/host/adv/periodic/src/common.c
index b4e4151c49a..105dd4b8382 100644
--- a/tests/bsim/bluetooth/host/adv/periodic/src/common.c
+++ b/tests/bsim/bluetooth/host/adv/periodic/src/common.c
@@ -6,21 +6,6 @@
 
 #include "common.h"
 
-extern enum bst_result_t bst_result;
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i seconds)\n", WAIT_SECONDS);
-	}
-}
-
-void test_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-	bst_result = In_progress;
-}
-
 uint8_t mfg_data[254] = {
 	0xFF, 0xFF, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C,
 	0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B,
diff --git a/tests/bsim/bluetooth/host/adv/periodic/src/common.h b/tests/bsim/bluetooth/host/adv/periodic/src/common.h
index 02a8fea70e8..03a1f0c5bbb 100644
--- a/tests/bsim/bluetooth/host/adv/periodic/src/common.h
+++ b/tests/bsim/bluetooth/host/adv/periodic/src/common.h
@@ -9,50 +9,7 @@
 #ifndef ZEPHYR_TEST_BSIM_BT_AUDIO_TEST_
 #define ZEPHYR_TEST_BSIM_BT_AUDIO_TEST_
 
-#include <zephyr/kernel.h>
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "time_machine.h"
-#include "bstests.h"
-
-#include <zephyr/types.h>
-#include <stddef.h>
-#include <errno.h>
-#include <zephyr/sys_clock.h>
-
-#include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/bluetooth/hci.h>
-#include <zephyr/bluetooth/conn.h>
-#include <zephyr/bluetooth/uuid.h>
-#include <zephyr/bluetooth/gatt.h>
-
-#define WAIT_SECONDS 15                         /* seconds */
-#define WAIT_TIME (WAIT_SECONDS * USEC_PER_SEC) /* microseconds*/
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define UNSET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)false)
-#define TEST_FLAG(flag) (atomic_get(&flag) == (atomic_t)true)
-#define WAIT_FOR_FLAG(flag) \
-	while (!(bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-
-#define FAIL(...) \
-	do { \
-		bst_result = Failed; \
-		bs_trace_error_time_line(__VA_ARGS__); \
-	} while (0)
-
-#define PASS(...) \
-	do { \
-		bst_result = Passed; \
-		bs_trace_info_time(1, "PASSED: " __VA_ARGS__); \
-	} while (0)
-
-void test_tick(bs_time_t HW_device_time);
-void test_init(void);
+#include <stdint.h>
 
 extern uint8_t mfg_data[254];
 
diff --git a/tests/bsim/bluetooth/host/adv/periodic/src/per_adv_advertiser.c b/tests/bsim/bluetooth/host/adv/periodic/src/per_adv_advertiser.c
index aa01d46db3c..3085bda474a 100644
--- a/tests/bsim/bluetooth/host/adv/periodic/src/per_adv_advertiser.c
+++ b/tests/bsim/bluetooth/host/adv/periodic/src/per_adv_advertiser.c
@@ -3,26 +3,28 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
+
+#include <errno.h>
 #include <zephyr/kernel.h>
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "time_machine.h"
-#include "bstests.h"
-
 #include <zephyr/types.h>
+#include <zephyr/sys_clock.h>
 #include <zephyr/sys/printk.h>
-
 #include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/uuid.h>
+#include <zephyr/bluetooth/gatt.h>
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 
 extern enum bst_result_t bst_result;
 
 static struct bt_conn *g_conn;
 
-CREATE_FLAG(flag_connected);
-CREATE_FLAG(flag_bonded);
+static DEFINE_FLAG(flag_connected);
+static DEFINE_FLAG(flag_bonded);
 
 static void connected(struct bt_conn *conn, uint8_t err)
 {
@@ -31,7 +33,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != BT_HCI_ERR_SUCCESS) {
-		FAIL("Failed to connect to %s: %u\n", addr, err);
+		TEST_FAIL("Failed to connect to %s: %u", addr, err);
 		return;
 	}
 
@@ -75,7 +77,7 @@ static void common_init(void)
 	err = bt_enable(NULL);
 
 	if (err) {
-		FAIL("Bluetooth init failed: %d\n", err);
+		TEST_FAIL("Bluetooth init failed: %d", err);
 		return;
 	}
 	printk("Bluetooth initialized\n");
@@ -249,7 +251,7 @@ static void main_per_adv_advertiser(void)
 	delete_adv_set(per_adv);
 	per_adv = NULL;
 
-	PASS("Periodic advertiser passed\n");
+	TEST_PASS("Periodic advertiser passed");
 }
 
 #if defined(CONFIG_BT_CTLR_PHY_CODED)
@@ -273,7 +275,7 @@ static void main_per_adv_advertiser_coded(void)
 	delete_adv_set(per_adv);
 	per_adv = NULL;
 
-	PASS("Periodic advertiser coded PHY passed\n");
+	TEST_PASS("Periodic advertiser coded PHY passed");
 }
 #endif /* CONFIG_BT_CTLR_PHY_CODED */
 
@@ -305,7 +307,7 @@ static void main_per_adv_conn_advertiser(void)
 	delete_adv_set(conn_adv);
 	conn_adv = NULL;
 
-	PASS("Periodic advertiser passed\n");
+	TEST_PASS("Periodic advertiser passed");
 }
 
 static void main_per_adv_conn_privacy_advertiser(void)
@@ -341,7 +343,7 @@ static void main_per_adv_conn_privacy_advertiser(void)
 	delete_adv_set(conn_adv);
 	conn_adv = NULL;
 
-	PASS("Periodic advertiser passed\n");
+	TEST_PASS("Periodic advertiser passed");
 }
 
 static void main_per_adv_long_data_advertiser(void)
@@ -366,7 +368,7 @@ static void main_per_adv_long_data_advertiser(void)
 	delete_adv_set(per_adv);
 	per_adv = NULL;
 #endif
-	PASS("Periodic long data advertiser passed\n");
+	TEST_PASS("Periodic long data advertiser passed");
 }
 
 static const struct bst_test_instance per_adv_advertiser[] = {
@@ -374,8 +376,6 @@ static const struct bst_test_instance per_adv_advertiser[] = {
 		.test_id = "per_adv_advertiser",
 		.test_descr = "Basic periodic advertising test. "
 			      "Will just start periodic advertising.",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_per_adv_advertiser
 	},
 #if defined(CONFIG_BT_CTLR_PHY_CODED)
@@ -383,8 +383,6 @@ static const struct bst_test_instance per_adv_advertiser[] = {
 		.test_id = "per_adv_advertiser_coded_phy",
 		.test_descr = "Basic periodic advertising test on Coded PHY. "
 			      "Advertiser and periodic advertiser uses Coded PHY",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_per_adv_advertiser_coded
 	},
 #endif /* CONFIG_BT_CTLR_PHY_CODED */
@@ -392,24 +390,18 @@ static const struct bst_test_instance per_adv_advertiser[] = {
 		.test_id = "per_adv_conn_advertiser",
 		.test_descr = "Periodic advertising test with concurrent ACL "
 			      "and PA sync.",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_per_adv_conn_advertiser
 	},
 	{
 		.test_id = "per_adv_conn_privacy_advertiser",
 		.test_descr = "Periodic advertising test with concurrent ACL "
 			      "with bonding and PA sync.",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_per_adv_conn_privacy_advertiser
 	},
 	{
 		.test_id = "per_adv_long_data_advertiser",
 		.test_descr = "Periodic advertising test with a longer data length. "
 			      "To test the reassembly of large data packets",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_per_adv_long_data_advertiser
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/adv/periodic/src/per_adv_sync.c b/tests/bsim/bluetooth/host/adv/periodic/src/per_adv_sync.c
index 08c3d125242..0b7a8969f9a 100644
--- a/tests/bsim/bluetooth/host/adv/periodic/src/per_adv_sync.c
+++ b/tests/bsim/bluetooth/host/adv/periodic/src/per_adv_sync.c
@@ -3,18 +3,20 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
+
+#include <errno.h>
 #include <zephyr/kernel.h>
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "time_machine.h"
-#include "bstests.h"
-
 #include <zephyr/types.h>
+#include <zephyr/sys_clock.h>
 #include <zephyr/sys/printk.h>
-
 #include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/uuid.h>
+#include <zephyr/bluetooth/gatt.h>
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 
 extern enum bst_result_t bst_result;
@@ -23,12 +25,12 @@ static struct bt_conn *g_conn;
 static bt_addr_le_t per_addr;
 static uint8_t per_sid;
 
-CREATE_FLAG(flag_connected);
-CREATE_FLAG(flag_bonded);
-CREATE_FLAG(flag_per_adv);
-CREATE_FLAG(flag_per_adv_sync);
-CREATE_FLAG(flag_per_adv_sync_lost);
-CREATE_FLAG(flag_per_adv_recv);
+static DEFINE_FLAG(flag_connected);
+static DEFINE_FLAG(flag_bonded);
+static DEFINE_FLAG(flag_per_adv);
+static DEFINE_FLAG(flag_per_adv_sync);
+static DEFINE_FLAG(flag_per_adv_sync_lost);
+static DEFINE_FLAG(flag_per_adv_recv);
 
 static void connected(struct bt_conn *conn, uint8_t err)
 {
@@ -37,7 +39,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != BT_HCI_ERR_SUCCESS) {
-		FAIL("Failed to connect to %s: %u\n", addr, err);
+		TEST_FAIL("Failed to connect to %s: %u", addr, err);
 		return;
 	}
 
@@ -77,24 +79,24 @@ static struct bt_conn_auth_info_cb auto_info_cbs = {
 static void scan_recv(const struct bt_le_scan_recv_info *info,
 		      struct net_buf_simple *buf)
 {
-	if (!TEST_FLAG(flag_connected) &&
+	if (!IS_FLAG_SET(flag_connected) &&
 	    info->adv_props & BT_GAP_ADV_PROP_CONNECTABLE) {
 		int err;
 
 		printk("Stopping scan\n");
 		err = bt_le_scan_stop();
 		if (err != 0) {
-			FAIL("Failed to stop scan: %d", err);
+			TEST_FAIL("Failed to stop scan: %d", err);
 			return;
 		}
 
 		err = bt_conn_le_create(info->addr, BT_CONN_LE_CREATE_CONN,
 					BT_LE_CONN_PARAM_DEFAULT, &g_conn);
 		if (err != 0) {
-			FAIL("Could not connect to peer: %d", err);
+			TEST_FAIL("Could not connect to peer: %d", err);
 			return;
 		}
-	} else if (!TEST_FLAG(flag_per_adv) && info->interval != 0U) {
+	} else if (!IS_FLAG_SET(flag_per_adv) && info->interval != 0U) {
 
 		per_sid = info->sid;
 		bt_addr_le_copy(&per_addr, info->addr);
@@ -142,7 +144,7 @@ static void recv_cb(struct bt_le_per_adv_sync *recv_sync,
 	char le_addr[BT_ADDR_LE_STR_LEN];
 	uint8_t buf_data_len;
 
-	if (TEST_FLAG(flag_per_adv_recv)) {
+	if (IS_FLAG_SET(flag_per_adv_recv)) {
 		return;
 	}
 
@@ -154,7 +156,7 @@ static void recv_cb(struct bt_le_per_adv_sync *recv_sync,
 		buf_data_len = (uint8_t)net_buf_simple_pull_le16(buf);
 		if (buf->data[0] - 1 != sizeof(mfg_data) ||
 			memcmp(buf->data, mfg_data, sizeof(mfg_data))) {
-			FAIL("Unexpected adv data received\n");
+			TEST_FAIL("Unexpected adv data received");
 		}
 		net_buf_simple_pull(buf, ARRAY_SIZE(mfg_data));
 	}
@@ -175,7 +177,7 @@ static void common_init(void)
 	err = bt_enable(NULL);
 
 	if (err) {
-		FAIL("Bluetooth init failed: %d\n", err);
+		TEST_FAIL("Bluetooth init failed: %d", err);
 		return;
 	}
 
@@ -195,7 +197,7 @@ static void start_scan(void)
 			       BT_LE_SCAN_CODED_ACTIVE : BT_LE_SCAN_ACTIVE,
 			       NULL);
 	if (err) {
-		FAIL("Failed to start scan: %d\n", err);
+		TEST_FAIL("Failed to start scan: %d", err);
 		return;
 	}
 	printk("done.\n");
@@ -214,7 +216,7 @@ static void create_pa_sync(struct bt_le_per_adv_sync **sync)
 	sync_create_param.timeout = 0x0a;
 	err = bt_le_per_adv_sync_create(&sync_create_param, sync);
 	if (err) {
-		FAIL("Failed to create periodic advertising sync: %d\n", err);
+		TEST_FAIL("Failed to create periodic advertising sync: %d", err);
 		return;
 	}
 	printk("done.\n");
@@ -231,7 +233,7 @@ static void start_bonding(void)
 	printk("Setting security...");
 	err = bt_conn_set_security(g_conn, BT_SECURITY_L2);
 	if (err) {
-		FAIL("Failed to set security: %d\n", err);
+		TEST_FAIL("Failed to set security: %d", err);
 		return;
 	}
 	printk("done.\n");
@@ -253,7 +255,7 @@ static void main_per_adv_sync(void)
 	printk("Waiting for periodic sync lost...\n");
 	WAIT_FOR_FLAG(flag_per_adv_sync_lost);
 
-	PASS("Periodic advertising sync passed\n");
+	TEST_PASS("Periodic advertising sync passed");
 }
 
 static void main_per_adv_sync_app_not_scanning(void)
@@ -271,7 +273,7 @@ static void main_per_adv_sync_app_not_scanning(void)
 	printk("Stopping scan\n");
 	err = bt_le_scan_stop();
 	if (err != 0) {
-		FAIL("Failed to stop scan: %d", err);
+		TEST_FAIL("Failed to stop scan: %d", err);
 		return;
 	}
 
@@ -280,7 +282,7 @@ static void main_per_adv_sync_app_not_scanning(void)
 	printk("Waiting for periodic sync lost...\n");
 	WAIT_FOR_FLAG(flag_per_adv_sync_lost);
 
-	PASS("Periodic advertising sync passed\n");
+	TEST_PASS("Periodic advertising sync passed");
 }
 
 static void main_per_adv_conn_sync(void)
@@ -305,7 +307,7 @@ static void main_per_adv_conn_sync(void)
 	printk("Waiting for periodic sync lost...\n");
 	WAIT_FOR_FLAG(flag_per_adv_sync_lost);
 
-	PASS("Periodic advertising sync passed\n");
+	TEST_PASS("Periodic advertising sync passed");
 }
 
 static void main_per_adv_conn_privacy_sync(void)
@@ -336,7 +338,7 @@ static void main_per_adv_conn_privacy_sync(void)
 	printk("Waiting for periodic sync lost...\n");
 	WAIT_FOR_FLAG(flag_per_adv_sync_lost);
 
-	PASS("Periodic advertising sync passed\n");
+	TEST_PASS("Periodic advertising sync passed");
 }
 
 static void main_per_adv_long_data_sync(void)
@@ -359,7 +361,7 @@ static void main_per_adv_long_data_sync(void)
 	printk("Waiting for periodic sync lost...\n");
 	WAIT_FOR_FLAG(flag_per_adv_sync_lost);
 #endif
-	PASS("Periodic advertising long data sync passed\n");
+	TEST_PASS("Periodic advertising long data sync passed");
 }
 
 static const struct bst_test_instance per_adv_sync[] = {
@@ -367,8 +369,6 @@ static const struct bst_test_instance per_adv_sync[] = {
 		.test_id = "per_adv_sync",
 		.test_descr = "Basic periodic advertising sync test. "
 			      "Will just sync to a periodic advertiser.",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_per_adv_sync
 	},
 	{
@@ -376,8 +376,6 @@ static const struct bst_test_instance per_adv_sync[] = {
 		.test_descr = "Basic periodic advertising sync test but where "
 			      "the app stopped scanning before creating sync."
 			      "Expect the host to start scanning automatically.",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_per_adv_sync_app_not_scanning
 	},
 	{
@@ -385,8 +383,6 @@ static const struct bst_test_instance per_adv_sync[] = {
 		.test_descr = "Periodic advertising sync test, but where there "
 			      "is a connection between the advertiser and the "
 			      "synchronized device.",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_per_adv_conn_sync
 	},
 	{
@@ -394,8 +390,6 @@ static const struct bst_test_instance per_adv_sync[] = {
 		.test_descr = "Periodic advertising sync test, but where "
 			      "advertiser and synchronized device are bonded and using  "
 			      "privacy",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_per_adv_conn_privacy_sync
 	},
 	{
@@ -403,8 +397,6 @@ static const struct bst_test_instance per_adv_sync[] = {
 		.test_descr = "Periodic advertising sync test with larger "
 			      "data length. Test is used to verify that "
 			      "reassembly of long data is handeled correctly.",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = main_per_adv_long_data_sync
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv.sh b/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv.sh
index a7b8d99b654..a27b9fedf4e 100755
--- a/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv.sh
+++ b/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv.sh
@@ -21,6 +21,6 @@ Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_host_adv_periodic_prj_conf \
   -testid=per_adv_sync -rs=6
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
-  -D=2 -sim_length=20e6 $@
+  -D=2 -sim_length=15e6 $@
 
 wait_for_background_jobs
diff --git a/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_app_not_scanning.sh b/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_app_not_scanning.sh
index 7176929cb2d..33c61af5fb9 100755
--- a/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_app_not_scanning.sh
+++ b/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_app_not_scanning.sh
@@ -21,6 +21,6 @@ Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_host_adv_periodic_prj_conf \
   -testid=per_adv_sync_app_not_scanning -rs=6
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
-  -D=2 -sim_length=20e6 $@
+  -D=2 -sim_length=15e6 $@
 
 wait_for_background_jobs
diff --git a/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_app_not_scanning_coded.sh b/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_app_not_scanning_coded.sh
index 31fd0195ddd..c64dbc4d20b 100755
--- a/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_app_not_scanning_coded.sh
+++ b/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_app_not_scanning_coded.sh
@@ -22,6 +22,6 @@ Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_host_adv_periodic_prj_coded_conf \
   -testid=per_adv_sync_app_not_scanning -rs=6
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
-  -D=2 -sim_length=20e6 $@
+  -D=2 -sim_length=15e6 $@
 
 wait_for_background_jobs
diff --git a/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_conn.sh b/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_conn.sh
index a459c91e450..dce1400647f 100755
--- a/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_conn.sh
+++ b/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_conn.sh
@@ -21,6 +21,6 @@ Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_host_adv_periodic_prj_conf \
   -testid=per_adv_conn_sync -rs=6
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
-  -D=2 -sim_length=20e6 $@
+  -D=2 -sim_length=15e6 $@
 
 wait_for_background_jobs
diff --git a/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_conn_privacy.sh b/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_conn_privacy.sh
index c3c4316ef5a..018887a2255 100755
--- a/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_conn_privacy.sh
+++ b/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_conn_privacy.sh
@@ -22,6 +22,6 @@ Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_host_adv_periodic_prj_conf \
   -testid=per_adv_conn_privacy_sync -rs=6
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
-  -D=2 -sim_length=20e6 $@
+  -D=2 -sim_length=15e6 $@
 
 wait_for_background_jobs
diff --git a/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_long_data.sh b/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_long_data.sh
index 732e8aa13dd..48c0934fb88 100755
--- a/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_long_data.sh
+++ b/tests/bsim/bluetooth/host/adv/periodic/tests_scripts/per_adv_long_data.sh
@@ -22,6 +22,6 @@ Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_host_adv_periodic_prj_long_data_co
   -testid=per_adv_long_data_sync -rs=6
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
-  -D=2 -sim_length=20e6 $@
+  -D=2 -sim_length=15e6 $@
 
 wait_for_background_jobs
diff --git a/tests/bsim/bluetooth/host/att/eatt/CMakeLists.txt b/tests/bsim/bluetooth/host/att/eatt/CMakeLists.txt
index 9f42ea3eb56..6bea3ce925d 100644
--- a/tests/bsim/bluetooth/host/att/eatt/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/att/eatt/CMakeLists.txt
@@ -5,6 +5,8 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_host)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
 
 target_sources(app PRIVATE
   src/common.c
diff --git a/tests/bsim/bluetooth/host/att/eatt/src/common.c b/tests/bsim/bluetooth/host/att/eatt/src/common.c
index 271d759dcd6..b0cec2ab3c5 100644
--- a/tests/bsim/bluetooth/host/att/eatt/src/common.c
+++ b/tests/bsim/bluetooth/host/att/eatt/src/common.c
@@ -6,6 +6,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include "babblekit/testcase.h"
 #include "common.h"
 #include "argparse.h"
 
@@ -30,7 +31,7 @@ static void connected(struct bt_conn *conn, uint8_t conn_err)
 			default_conn = NULL;
 		}
 
-		FAIL("Failed to connect to %s (%u)\n", addr, conn_err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, conn_err);
 		return;
 	}
 
@@ -77,44 +78,30 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 
 	err = bt_le_scan_stop();
 	if (err) {
-		FAIL("Stop LE scan failed (err %d)\n", err);
+		TEST_FAIL("Stop LE scan failed (err %d)", err);
 	}
 
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, BT_LE_CONN_PARAM_DEFAULT,
 				&default_conn);
 	if (err) {
-		FAIL("Create conn failed (err %d)\n", err);
+		TEST_FAIL("Create conn failed (err %d)", err);
 	}
 
 	printk("Device connected\n");
 }
 
-void test_init(void)
-{
-	bst_ticker_set_next_tick_absolute(60e6); /* 60 seconds */
-	bst_result = In_progress;
-}
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		bst_result = Failed;
-		bs_trace_error_time_line("Test eatt finished.\n");
-	}
-}
-
 void central_setup_and_connect(void)
 {
 	int err;
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Can't enable Bluetooth (err %d)\n", err);
+		TEST_FAIL("Can't enable Bluetooth (err %d)", err);
 	}
 
 	err = bt_le_scan_start(BT_LE_SCAN_ACTIVE, device_found);
 	if (err) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 	}
 
 	while (!is_connected) {
@@ -123,7 +110,7 @@ void central_setup_and_connect(void)
 
 	err = bt_conn_set_security(default_conn, BT_SECURITY_L2);
 	if (err) {
-		FAIL("Failed to start encryption procedure\n");
+		TEST_FAIL("Failed to start encryption procedure");
 	}
 
 	while (!is_encrypted) {
@@ -137,12 +124,12 @@ void peripheral_setup_and_connect(void)
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Can't enable Bluetooth (err %d)\n", err);
+		TEST_FAIL("Can't enable Bluetooth (err %d)", err);
 	}
 
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, ad, ARRAY_SIZE(ad), NULL, 0);
 	if (err) {
-		FAIL("Advertising failed to start (err %d)\n", err);
+		TEST_FAIL("Advertising failed to start (err %d)", err);
 	}
 
 	while (!is_connected) {
@@ -168,56 +155,10 @@ void disconnect(void)
 
 	err = bt_conn_disconnect(default_conn, BT_HCI_ERR_REMOTE_USER_TERM_CONN);
 	if (err) {
-		FAIL("Disconnection failed (err %d)\n", err);
+		TEST_FAIL("Disconnection failed (err %d)", err);
 	}
 
 	while (is_connected) {
 		k_sleep(K_MSEC(100));
 	}
 }
-
-
-#define CHANNEL_ID 0
-#define MSG_SIZE 1
-
-void backchannel_init(void)
-{
-	uint device_number = get_device_nbr();
-	uint peer_number = device_number ^ 1;
-	uint device_numbers[] = { peer_number };
-	uint channel_numbers[] = { CHANNEL_ID };
-	uint *ch;
-
-	ch = bs_open_back_channel(device_number, device_numbers, channel_numbers,
-				  ARRAY_SIZE(channel_numbers));
-	if (!ch) {
-		FAIL("Unable to open backchannel\n");
-	}
-}
-
-void backchannel_sync_send(void)
-{
-	uint8_t sync_msg[MSG_SIZE] = { get_device_nbr() };
-
-	printk("Sending sync\n");
-	bs_bc_send_msg(CHANNEL_ID, sync_msg, ARRAY_SIZE(sync_msg));
-}
-
-void backchannel_sync_wait(void)
-{
-	uint8_t sync_msg[MSG_SIZE];
-
-	while (true) {
-		if (bs_bc_is_msg_received(CHANNEL_ID) > 0) {
-			bs_bc_receive_msg(CHANNEL_ID, sync_msg, ARRAY_SIZE(sync_msg));
-			if (sync_msg[0] != get_device_nbr()) {
-				/* Received a message from another device, exit */
-				break;
-			}
-		}
-
-		k_sleep(K_MSEC(1));
-	}
-
-	printk("Sync received\n");
-}
diff --git a/tests/bsim/bluetooth/host/att/eatt/src/common.h b/tests/bsim/bluetooth/host/att/eatt/src/common.h
index 49bc88f03fd..6dd9519f8d7 100644
--- a/tests/bsim/bluetooth/host/att/eatt/src/common.h
+++ b/tests/bsim/bluetooth/host/att/eatt/src/common.h
@@ -17,32 +17,6 @@
 #include <zephyr/bluetooth/conn.h>
 #include <zephyr/bluetooth/att.h>
 
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "bstests.h"
-#include "bs_pc_backchannel.h"
-
-extern enum bst_result_t bst_result;
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define WAIT_FOR_FLAG(flag) \
-	while (!(bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-
-#define FAIL(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Failed;                                                               \
-		bs_trace_error_time_line(__VA_ARGS__);                                             \
-	} while (0)
-
-#define PASS(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Passed;                                                               \
-		bs_trace_info_time(1, __VA_ARGS__);                                                \
-	} while (0)
-
 extern volatile int num_eatt_channels;
 extern struct bt_conn *default_conn;
 
@@ -50,8 +24,3 @@ void central_setup_and_connect(void);
 void peripheral_setup_and_connect(void);
 void wait_for_disconnect(void);
 void disconnect(void);
-void test_init(void);
-void test_tick(bs_time_t HW_device_time);
-void backchannel_init(void);
-void backchannel_sync_send(void);
-void backchannel_sync_wait(void);
diff --git a/tests/bsim/bluetooth/host/att/eatt/src/main_autoconnect.c b/tests/bsim/bluetooth/host/att/eatt/src/main_autoconnect.c
index 89b46b30f25..ba19c66db4e 100644
--- a/tests/bsim/bluetooth/host/att/eatt/src/main_autoconnect.c
+++ b/tests/bsim/bluetooth/host/att/eatt/src/main_autoconnect.c
@@ -6,6 +6,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include "babblekit/testcase.h"
 #include "common.h"
 
 static void test_peripheral_main(void)
@@ -21,7 +22,7 @@ static void test_peripheral_main(void)
 
 	disconnect();
 
-	PASS("EATT Peripheral tests Passed\n");
+	TEST_PASS("EATT Peripheral tests Passed");
 }
 
 static void test_central_main(void)
@@ -34,22 +35,18 @@ static void test_central_main(void)
 
 	wait_for_disconnect();
 
-	PASS("EATT Central tests Passed\n");
+	TEST_PASS("EATT Central tests Passed");
 }
 
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "peripheral_autoconnect",
 		.test_descr = "Peripheral autoconnect",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_peripheral_main,
 	},
 	{
 		.test_id = "central_autoconnect",
 		.test_descr = "Central autoconnect",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_central_main,
 	},
 	BSTEST_END_MARKER,
diff --git a/tests/bsim/bluetooth/host/att/eatt/src/main_collision.c b/tests/bsim/bluetooth/host/att/eatt/src/main_collision.c
index d4bd2f8abb2..f280ab28ea3 100644
--- a/tests/bsim/bluetooth/host/att/eatt/src/main_collision.c
+++ b/tests/bsim/bluetooth/host/att/eatt/src/main_collision.c
@@ -6,25 +6,27 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include "babblekit/testcase.h"
+#include "babblekit/sync.h"
 #include "common.h"
 
 static void test_peripheral_main(void)
 {
 	int err;
 
-	backchannel_init();
+	TEST_ASSERT(bk_sync_init() == 0, "Failed to open backchannel");
 
 	peripheral_setup_and_connect();
 
 	/*
 	 * we need to sync with peer to ensure that we get collisions
 	 */
-	backchannel_sync_send();
-	backchannel_sync_wait();
+	bk_sync_send();
+	bk_sync_wait();
 
 	err = bt_eatt_connect(default_conn, CONFIG_BT_EATT_MAX);
 	if (err) {
-		FAIL("Sending credit based connection request failed (err %d)\n", err);
+		TEST_FAIL("Sending credit based connection request failed (err %d)", err);
 	}
 
 	while (bt_eatt_count(default_conn) < CONFIG_BT_EATT_MAX) {
@@ -36,23 +38,23 @@ static void test_peripheral_main(void)
 
 	disconnect();
 
-	PASS("EATT Peripheral tests Passed\n");
+	TEST_PASS("EATT Peripheral tests Passed");
 }
 
 static void test_central_main(void)
 {
 	int err;
 
-	backchannel_init();
+	TEST_ASSERT(bk_sync_init() == 0, "Failed to open backchannel");
 
 	central_setup_and_connect();
 
-	backchannel_sync_wait();
-	backchannel_sync_send();
+	bk_sync_wait();
+	bk_sync_send();
 
 	err = bt_eatt_connect(default_conn, CONFIG_BT_EATT_MAX);
 	if (err) {
-		FAIL("Sending credit based connection request failed (err %d)\n", err);
+		TEST_FAIL("Sending credit based connection request failed (err %d)", err);
 	}
 
 	while (bt_eatt_count(default_conn) < CONFIG_BT_EATT_MAX) {
@@ -61,22 +63,18 @@ static void test_central_main(void)
 
 	wait_for_disconnect();
 
-	PASS("EATT Central tests Passed\n");
+	TEST_PASS("EATT Central tests Passed");
 }
 
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "peripheral",
 		.test_descr = "Peripheral Collision",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_peripheral_main,
 	},
 	{
 		.test_id = "central",
 		.test_descr = "Central Collision",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_central_main,
 	},
 	BSTEST_END_MARKER,
diff --git a/tests/bsim/bluetooth/host/att/eatt/src/main_lowres.c b/tests/bsim/bluetooth/host/att/eatt/src/main_lowres.c
index fb93cbdba0e..c6b3752ad24 100644
--- a/tests/bsim/bluetooth/host/att/eatt/src/main_lowres.c
+++ b/tests/bsim/bluetooth/host/att/eatt/src/main_lowres.c
@@ -6,6 +6,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include "babblekit/testcase.h"
 #include "common.h"
 
 static void test_peripheral_main(void)
@@ -18,7 +19,7 @@ static void test_peripheral_main(void)
 
 	disconnect();
 
-	PASS("EATT Peripheral tests Passed\n");
+	TEST_PASS("EATT Peripheral tests Passed");
 }
 
 static void test_central_main(void)
@@ -35,22 +36,18 @@ static void test_central_main(void)
 
 	wait_for_disconnect();
 
-	PASS("EATT Central tests Passed\n");
+	TEST_PASS("EATT Central tests Passed");
 }
 
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "peripheral_lowres",
 		.test_descr = "Peripheral lowres",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_peripheral_main,
 	},
 	{
 		.test_id = "central_lowres",
 		.test_descr = "Central lowres",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_central_main,
 	},
 	BSTEST_END_MARKER,
diff --git a/tests/bsim/bluetooth/host/att/eatt/src/main_reconfigure.c b/tests/bsim/bluetooth/host/att/eatt/src/main_reconfigure.c
index c208fc09484..138583f4ce2 100644
--- a/tests/bsim/bluetooth/host/att/eatt/src/main_reconfigure.c
+++ b/tests/bsim/bluetooth/host/att/eatt/src/main_reconfigure.c
@@ -6,13 +6,16 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
+#include "babblekit/sync.h"
 #include "common.h"
 
 #include <zephyr/bluetooth/gatt.h>
 
 #define NEW_MTU 100
 
-CREATE_FLAG(flag_reconfigured);
+static DEFINE_FLAG(flag_reconfigured);
 
 void att_mtu_updated(struct bt_conn *conn, uint16_t tx, uint16_t rx)
 {
@@ -29,7 +32,7 @@ static struct bt_gatt_cb cb = {
 
 static void test_peripheral_main(void)
 {
-	backchannel_init();
+	TEST_ASSERT(bk_sync_init() == 0, "Failed to open backchannel");
 
 	peripheral_setup_and_connect();
 
@@ -39,25 +42,25 @@ static void test_peripheral_main(void)
 	while (bt_eatt_count(default_conn) < CONFIG_BT_EATT_MAX) {
 		k_sleep(K_MSEC(10));
 	}
-	backchannel_sync_send();
-	backchannel_sync_wait();
+	bk_sync_send();
+	bk_sync_wait();
 
 	WAIT_FOR_FLAG(flag_reconfigured);
-	backchannel_sync_send();
+	bk_sync_send();
 
 	/* Wait for the reconfigured flag on the other end */
-	backchannel_sync_wait();
+	bk_sync_wait();
 
 	disconnect();
 
-	PASS("EATT Peripheral tests Passed\n");
+	TEST_PASS("EATT Peripheral tests Passed");
 }
 
 static void test_central_main(void)
 {
 	int err;
 
-	backchannel_init();
+	TEST_ASSERT(bk_sync_init() == 0, "Failed to open backchannel");
 
 	central_setup_and_connect();
 
@@ -69,35 +72,31 @@ static void test_central_main(void)
 
 	err = bt_eatt_reconfigure(default_conn, NEW_MTU);
 	if (err < 0) {
-		FAIL("Reconfigure failed (%d)\n", err);
+		TEST_FAIL("Reconfigure failed (%d)", err);
 	}
-	backchannel_sync_send();
-	backchannel_sync_wait();
+	bk_sync_send();
+	bk_sync_wait();
 
 	WAIT_FOR_FLAG(flag_reconfigured);
-	backchannel_sync_send();
+	bk_sync_send();
 
 	/* Wait for the reconfigured flag on the other end */
-	backchannel_sync_wait();
+	bk_sync_wait();
 
 	wait_for_disconnect();
 
-	PASS("EATT Central tests Passed\n");
+	TEST_PASS("EATT Central tests Passed");
 }
 
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "peripheral_reconfigure",
 		.test_descr = "Peripheral reconfigure",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_peripheral_main,
 	},
 	{
 		.test_id = "central_reconfigure",
 		.test_descr = "Central reconfigure",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_central_main,
 	},
 	BSTEST_END_MARKER,
diff --git a/tests/bsim/bluetooth/host/att/eatt/tests_scripts/autoconnect.sh b/tests/bsim/bluetooth/host/att/eatt/tests_scripts/autoconnect.sh
index 057e76f1813..47fc5f0e2a0 100755
--- a/tests/bsim/bluetooth/host/att/eatt/tests_scripts/autoconnect.sh
+++ b/tests/bsim/bluetooth/host/att/eatt/tests_scripts/autoconnect.sh
@@ -17,6 +17,6 @@ Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_host_att_eatt_prj_autoconnect_conf
   -v=${verbosity_level} -s=${simulation_id} -d=1 -testid=peripheral_autoconnect -RealEncryption=1
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
-  -D=2 -sim_length=200e6 $@
+  -D=2 -sim_length=60e6 $@
 
 wait_for_background_jobs
diff --git a/tests/bsim/bluetooth/host/att/eatt/tests_scripts/collision.sh b/tests/bsim/bluetooth/host/att/eatt/tests_scripts/collision.sh
index c89bab27548..010ac1600cb 100755
--- a/tests/bsim/bluetooth/host/att/eatt/tests_scripts/collision.sh
+++ b/tests/bsim/bluetooth/host/att/eatt/tests_scripts/collision.sh
@@ -17,6 +17,6 @@ Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_host_att_eatt_prj_collision_conf \
   -v=${verbosity_level} -s=${simulation_id} -d=1 -testid=peripheral -RealEncryption=1
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
-  -D=2 -sim_length=200e6 $@
+  -D=2 -sim_length=60e6 $@
 
 wait_for_background_jobs
diff --git a/tests/bsim/bluetooth/host/att/eatt/tests_scripts/lowres.sh b/tests/bsim/bluetooth/host/att/eatt/tests_scripts/lowres.sh
index 0d988761adf..b12d045edd9 100755
--- a/tests/bsim/bluetooth/host/att/eatt/tests_scripts/lowres.sh
+++ b/tests/bsim/bluetooth/host/att/eatt/tests_scripts/lowres.sh
@@ -16,6 +16,6 @@ Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_host_att_eatt_prj_lowres_conf \
   -v=${verbosity_level} -s=${simulation_id} -d=1 -testid=peripheral_lowres -RealEncryption=1
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
-  -D=2 -sim_length=200e6 $@
+  -D=2 -sim_length=60e6 $@
 
 wait_for_background_jobs
diff --git a/tests/bsim/bluetooth/host/att/eatt/tests_scripts/multiple_conn.sh b/tests/bsim/bluetooth/host/att/eatt/tests_scripts/multiple_conn.sh
index e3919eb4a26..9bdf58693dc 100755
--- a/tests/bsim/bluetooth/host/att/eatt/tests_scripts/multiple_conn.sh
+++ b/tests/bsim/bluetooth/host/att/eatt/tests_scripts/multiple_conn.sh
@@ -17,6 +17,6 @@ Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_host_att_eatt_prj_multiple_conn_co
   -v=${verbosity_level} -s=${simulation_id} -d=1 -testid=peripheral -RealEncryption=1
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
-  -D=2 -sim_length=200e6 $@
+  -D=2 -sim_length=60e6 $@
 
 wait_for_background_jobs
diff --git a/tests/bsim/bluetooth/host/att/eatt_notif/CMakeLists.txt b/tests/bsim/bluetooth/host/att/eatt_notif/CMakeLists.txt
index 202f757b3b7..bb9f7adb430 100644
--- a/tests/bsim/bluetooth/host/att/eatt_notif/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/att/eatt_notif/CMakeLists.txt
@@ -5,6 +5,9 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_eatt_notif)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 FILE(GLOB app_sources src/*.c)
 target_sources(app PRIVATE ${app_sources} )
 
diff --git a/tests/bsim/bluetooth/host/att/eatt_notif/src/client_test.c b/tests/bsim/bluetooth/host/att/eatt_notif/src/client_test.c
index 5f403304fcb..e846b1d05b9 100644
--- a/tests/bsim/bluetooth/host/att/eatt_notif/src/client_test.c
+++ b/tests/bsim/bluetooth/host/att/eatt_notif/src/client_test.c
@@ -14,16 +14,25 @@
  * on EATT channels.
  */
 
+#include <stddef.h>
+#include <errno.h>
+#include <zephyr/kernel.h>
+#include <zephyr/types.h>
 #include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/bluetooth/gatt.h>
+#include <zephyr/bluetooth/hci.h>
 #include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/uuid.h>
+#include <zephyr/bluetooth/gatt.h>
 #include <zephyr/bluetooth/att.h>
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
+#include "babblekit/sync.h"
 #include "common.h"
 
-CREATE_FLAG(flag_is_connected);
-CREATE_FLAG(flag_discover_complete);
-CREATE_FLAG(flag_is_encrypted);
+static DEFINE_FLAG(flag_is_connected);
+static DEFINE_FLAG(flag_discover_complete);
+static DEFINE_FLAG(flag_is_encrypted);
 
 static struct bt_conn *g_conn;
 static const struct bt_gatt_attr *local_attr;
@@ -42,7 +51,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != 0) {
-		FAIL("Failed to connect to %s (%u)\n", addr, err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, err);
 		return;
 	}
 
@@ -103,14 +112,14 @@ void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 	printk("Stopping scan\n");
 	err = bt_le_scan_stop();
 	if (err != 0) {
-		FAIL("Could not stop scan: %d");
+		TEST_FAIL("Could not stop scan: %d");
 		return;
 	}
 
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN,
 				BT_LE_CONN_PARAM_DEFAULT, &g_conn);
 	if (err != 0) {
-		FAIL("Could not connect to peer: %d", err);
+		TEST_FAIL("Could not connect to peer: %d", err);
 	}
 }
 
@@ -157,7 +166,7 @@ static void gatt_discover(void)
 
 	err = bt_gatt_discover(g_conn, &discover_params);
 	if (err != 0) {
-		FAIL("Discover failed(err %d)\n", err);
+		TEST_FAIL("Discover failed(err %d)", err);
 	}
 }
 
@@ -172,16 +181,16 @@ static void test_main(void)
 {
 	int err;
 
-	device_sync_init(PERIPHERAL_ID);
+	TEST_ASSERT(bk_sync_init() == 0, "Failed to open backchannel");
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth enable failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth enable failed (err %d)", err);
 	}
 
 	err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
 	if (err != 0) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 	}
 
 	printk("Scanning successfully started\n");
@@ -190,14 +199,14 @@ static void test_main(void)
 
 	err = bt_conn_set_security(g_conn, BT_SECURITY_L2);
 	if (err) {
-		FAIL("Failed to start encryption procedure\n");
+		TEST_FAIL("Failed to start encryption procedure");
 	}
 
 	WAIT_FOR_FLAG(flag_is_encrypted);
 
 	err = bt_eatt_connect(g_conn, CONFIG_BT_EATT_MAX);
 	if (err) {
-		FAIL("Sending credit based connection request failed (err %d)\n", err);
+		TEST_FAIL("Sending credit based connection request failed (err %d)", err);
 	}
 
 	/* Wait for the channels to be connected */
@@ -206,7 +215,7 @@ static void test_main(void)
 	}
 
 	printk("Waiting for sync\n");
-	device_sync_wait();
+	bk_sync_wait();
 
 	local_attr = &g_svc.attrs[1];
 
@@ -227,7 +236,7 @@ static void test_main(void)
 	printk("Connecting %d bearers\n", EATT_BEARERS_TEST);
 	err = bt_eatt_connect(g_conn, EATT_BEARERS_TEST);
 	if (err) {
-		FAIL("Sending credit based connection request failed (err %d)\n", err);
+		TEST_FAIL("Sending credit based connection request failed (err %d)", err);
 	}
 
 	/* Wait for the channels to be connected */
@@ -237,22 +246,20 @@ static void test_main(void)
 
 	printk("############# Send notifications during discovery request\n");
 	gatt_discover();
-	while (!TEST_FLAG(flag_discover_complete)) {
+	while (!IS_FLAG_SET(flag_discover_complete)) {
 		printk("Notifying...\n");
 		send_notification();
 	}
 
 	printk("Sending final sync\n");
-	device_sync_send();
+	bk_sync_send();
 
-	PASS("Client Passed\n");
+	TEST_PASS("Client Passed");
 }
 
 static const struct bst_test_instance test_vcs[] = {
 	{
 		.test_id = "client",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/att/eatt_notif/src/common.c b/tests/bsim/bluetooth/host/att/eatt_notif/src/common.c
deleted file mode 100644
index 1df3895fc3e..00000000000
--- a/tests/bsim/bluetooth/host/att/eatt_notif/src/common.c
+++ /dev/null
@@ -1,67 +0,0 @@
-/*
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "common.h"
-#include <zephyr/logging/log.h>
-
-#define LOG_MODULE_NAME common
-
-LOG_MODULE_REGISTER(LOG_MODULE_NAME, LOG_LEVEL_DBG);
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i seconds)\n", WAIT_TIME);
-	}
-}
-
-void test_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-	bst_result = In_progress;
-}
-
-/* Call in init functions*/
-void device_sync_init(uint device_nbr)
-{
-	uint peer;
-
-	if (device_nbr == CENTRAL_ID) {
-		peer = PERIPHERAL_ID;
-	} else {
-		peer = CENTRAL_ID;
-	}
-
-	uint dev_nbrs[BACK_CHANNELS] = { peer };
-	uint channel_nbrs[BACK_CHANNELS] = { 0 };
-	const uint *ch = bs_open_back_channel(device_nbr, dev_nbrs, channel_nbrs, BACK_CHANNELS);
-
-	if (!ch) {
-		LOG_ERR("bs_open_back_channel failed!");
-	}
-}
-
-/* Call it to make peer to proceed.*/
-void device_sync_send(void)
-{
-	uint8_t msg[1] = "S";
-
-	bs_bc_send_msg(0, msg, sizeof(msg));
-}
-
-/* Wait until peer send sync*/
-void device_sync_wait(void)
-{
-	int size_msg_received = 0;
-	uint8_t msg;
-
-	while (!size_msg_received) {
-		size_msg_received = bs_bc_is_msg_received(0);
-		k_sleep(K_MSEC(1));
-	}
-
-	bs_bc_receive_msg(0, &msg, size_msg_received);
-}
diff --git a/tests/bsim/bluetooth/host/att/eatt_notif/src/common.h b/tests/bsim/bluetooth/host/att/eatt_notif/src/common.h
index aecbda9cbe6..ec2c039acb9 100644
--- a/tests/bsim/bluetooth/host/att/eatt_notif/src/common.h
+++ b/tests/bsim/bluetooth/host/att/eatt_notif/src/common.h
@@ -6,49 +6,6 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <zephyr/kernel.h>
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "time_machine.h"
-#include "bstests.h"
-
-#include <zephyr/types.h>
-#include <stddef.h>
-#include <errno.h>
-
-#include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/bluetooth/hci.h>
-#include <zephyr/bluetooth/conn.h>
-#include <zephyr/bluetooth/uuid.h>
-#include <zephyr/bluetooth/gatt.h>
-#include "bs_pc_backchannel.h"
-
-extern enum bst_result_t bst_result;
-
-#define WAIT_TIME (30 * 1e6) /*seconds*/
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define UNSET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)false)
-#define TEST_FLAG(flag) (atomic_get(&flag) == (atomic_t)true)
-#define WAIT_FOR_FLAG(flag) \
-	while (!(bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-
-#define FAIL(...) \
-	do { \
-		bst_result = Failed; \
-		bs_trace_error_time_line(__VA_ARGS__); \
-	} while (0)
-
-#define PASS(...) \
-	do { \
-		bst_result = Passed; \
-		bs_trace_info_time(1, __VA_ARGS__); \
-	} while (0)
-
 #define CHRC_SIZE 10
 #define LONG_CHRC_SIZE 40
 
@@ -63,13 +20,3 @@ extern enum bst_result_t bst_result;
 #define TEST_LONG_CHRC_UUID \
 	BT_UUID_DECLARE_128(0x01, 0x23, 0x45, 0x67, 0x89, 0x01, 0x02, 0x03, \
 			    0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0xFF, 0x11)
-
-#define CENTRAL_ID 0
-#define PERIPHERAL_ID 1
-#define BACK_CHANNELS 1
-
-void test_tick(bs_time_t HW_device_time);
-void test_init(void);
-void device_sync_init(uint device_nbr);
-void device_sync_send(void);
-void device_sync_wait(void);
diff --git a/tests/bsim/bluetooth/host/att/eatt_notif/src/server_test.c b/tests/bsim/bluetooth/host/att/eatt_notif/src/server_test.c
index 474fb101113..94cf4ab699b 100644
--- a/tests/bsim/bluetooth/host/att/eatt_notif/src/server_test.c
+++ b/tests/bsim/bluetooth/host/att/eatt_notif/src/server_test.c
@@ -4,15 +4,27 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include "common.h"
+#include <stddef.h>
+#include <errno.h>
+#include <zephyr/kernel.h>
+#include <zephyr/types.h>
+#include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
 #include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/uuid.h>
+#include <zephyr/bluetooth/gatt.h>
 #include <zephyr/bluetooth/att.h>
 
-CREATE_FLAG(flag_discover_complete);
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
+#include "babblekit/sync.h"
+#include "common.h"
+
+static DEFINE_FLAG(flag_discover_complete);
 
 extern enum bst_result_t bst_result;
 
-CREATE_FLAG(flag_is_connected);
+static DEFINE_FLAG(flag_is_connected);
 
 static struct bt_conn *g_conn;
 
@@ -23,7 +35,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != 0) {
-		FAIL("Failed to connect to %s (%u)\n", addr, err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, err);
 		return;
 	}
 
@@ -65,7 +77,7 @@ static uint8_t discover_func(struct bt_conn *conn,
 
 	if (attr == NULL) {
 		if (chrc_handle == 0) {
-			FAIL("Did not discover chrc (%x)", chrc_handle);
+			TEST_FAIL("Did not discover chrc (%x)", chrc_handle);
 		}
 
 		(void)memset(params, 0, sizeof(*params));
@@ -86,7 +98,7 @@ static uint8_t discover_func(struct bt_conn *conn,
 
 		err = bt_gatt_discover(conn, params);
 		if (err != 0) {
-			FAIL("Discover failed (err %d)\n", err);
+			TEST_FAIL("Discover failed (err %d)", err);
 		}
 
 		return BT_GATT_ITER_STOP;
@@ -119,7 +131,7 @@ static void gatt_discover(void)
 
 	err = bt_gatt_discover(g_conn, &discover_params);
 	if (err != 0) {
-		FAIL("Discover failed(err %d)\n", err);
+		TEST_FAIL("Discover failed(err %d)", err);
 	}
 
 	printk("Discovery complete\n");
@@ -146,7 +158,7 @@ void subscribed_cb(struct bt_conn *conn, uint8_t err,
 	       params->ccc_handle);
 
 	printk("Sending sync to peer\n");
-	device_sync_send();
+	bk_sync_send();
 }
 
 static struct bt_gatt_discover_params disc_params;
@@ -168,7 +180,7 @@ static void gatt_subscribe(void)
 	printk("Subscribing: val %x\n", chrc_handle);
 	err = bt_gatt_subscribe(g_conn, &subscribe_params);
 	if (err != 0) {
-		FAIL("Subscription failed(err %d)\n", err);
+		TEST_FAIL("Subscription failed(err %d)", err);
 	}
 }
 
@@ -179,11 +191,11 @@ static void test_main(void)
 		BT_DATA_BYTES(BT_DATA_FLAGS, (BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR))
 	};
 
-	device_sync_init(CENTRAL_ID);
+	TEST_ASSERT(bk_sync_init() == 0, "Failed to open backchannel");
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 		return;
 	}
 
@@ -191,7 +203,7 @@ static void test_main(void)
 
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, ad, ARRAY_SIZE(ad), NULL, 0);
 	if (err != 0) {
-		FAIL("Advertising failed to start (err %d)\n", err);
+		TEST_FAIL("Advertising failed to start (err %d)", err);
 		return;
 	}
 
@@ -209,16 +221,14 @@ static void test_main(void)
 	gatt_subscribe();
 
 	printk("Waiting for final sync\n");
-	device_sync_wait();
+	bk_sync_wait();
 
-	PASS("Server Passed\n");
+	TEST_PASS("Server Passed");
 }
 
 static const struct bst_test_instance test_server[] = {
 	{
 		.test_id = "server",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/att/eatt_notif/test_scripts/eatt_notif.sh b/tests/bsim/bluetooth/host/att/eatt_notif/test_scripts/eatt_notif.sh
index 39000efbc74..39d442e38b2 100755
--- a/tests/bsim/bluetooth/host/att/eatt_notif/test_scripts/eatt_notif.sh
+++ b/tests/bsim/bluetooth/host/att/eatt_notif/test_scripts/eatt_notif.sh
@@ -19,6 +19,6 @@ Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_host_att_eatt_notif_prj_conf \
   -v=${verbosity_level} -s=${simulation_id} -d=1 -testid=server -RealEncryption=1
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
-  -D=2 -sim_length=60e6 $@
+  -D=2 -sim_length=30e6 $@
 
 wait_for_background_jobs
diff --git a/tests/bsim/bluetooth/host/gatt/authorization/CMakeLists.txt b/tests/bsim/bluetooth/host/gatt/authorization/CMakeLists.txt
index acb0dd45947..6746842d40b 100644
--- a/tests/bsim/bluetooth/host/gatt/authorization/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/gatt/authorization/CMakeLists.txt
@@ -5,6 +5,9 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_gatt_authorization)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 FILE(GLOB app_sources src/*.c)
 target_sources(app PRIVATE ${app_sources} )
 
diff --git a/tests/bsim/bluetooth/host/gatt/authorization/src/common.c b/tests/bsim/bluetooth/host/gatt/authorization/src/common.c
deleted file mode 100644
index adff2dd05ef..00000000000
--- a/tests/bsim/bluetooth/host/gatt/authorization/src/common.c
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * Copyright (c) 2024 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "common.h"
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i seconds)\n", WAIT_TIME);
-	}
-}
-
-void test_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-	bst_result = In_progress;
-}
diff --git a/tests/bsim/bluetooth/host/gatt/authorization/src/common.h b/tests/bsim/bluetooth/host/gatt/authorization/src/common.h
index 339919dfe88..358b8ec9de5 100644
--- a/tests/bsim/bluetooth/host/gatt/authorization/src/common.h
+++ b/tests/bsim/bluetooth/host/gatt/authorization/src/common.h
@@ -6,47 +6,6 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <zephyr/kernel.h>
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "time_machine.h"
-#include "bstests.h"
-
-#include <zephyr/types.h>
-#include <stddef.h>
-#include <errno.h>
-
-#include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/bluetooth/hci.h>
-#include <zephyr/bluetooth/conn.h>
-#include <zephyr/bluetooth/uuid.h>
-#include <zephyr/bluetooth/gatt.h>
-
-extern enum bst_result_t bst_result;
-
-#define WAIT_TIME (30 * 1e6) /*seconds*/
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define UNSET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)false)
-#define WAIT_FOR_FLAG(flag) \
-	while (!(bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-
-#define FAIL(...) \
-	do { \
-		bst_result = Failed; \
-		bs_trace_error_time_line(__VA_ARGS__); \
-	} while (0)
-
-#define PASS(...) \
-	do { \
-		bst_result = Passed; \
-		bs_trace_info_time(1, __VA_ARGS__); \
-	} while (0)
-
 #define CHRC_SIZE 10
 
 #define TEST_SERVICE_UUID \
@@ -68,6 +27,3 @@ extern enum bst_result_t bst_result;
 #define TEST_CP_CHRC_UUID \
 	BT_UUID_DECLARE_128(0x01, 0x23, 0x45, 0x67, 0x89, 0x01, 0x02, 0x03, \
 			    0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0xF0, 0x00)
-
-void test_tick(bs_time_t HW_device_time);
-void test_init(void);
diff --git a/tests/bsim/bluetooth/host/gatt/authorization/src/gatt_client_test.c b/tests/bsim/bluetooth/host/gatt/authorization/src/gatt_client_test.c
index fb8d7e71133..3e162d50297 100644
--- a/tests/bsim/bluetooth/host/gatt/authorization/src/gatt_client_test.c
+++ b/tests/bsim/bluetooth/host/gatt/authorization/src/gatt_client_test.c
@@ -4,15 +4,25 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <zephyr/kernel.h>
+#include <zephyr/types.h>
+#include <stddef.h>
+#include <errno.h>
+
 #include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/uuid.h>
 #include <zephyr/bluetooth/gatt.h>
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 
-CREATE_FLAG(flag_is_connected);
-CREATE_FLAG(flag_discover_complete);
-CREATE_FLAG(flag_write_complete);
-CREATE_FLAG(flag_read_complete);
+static DEFINE_FLAG(flag_is_connected);
+static DEFINE_FLAG(flag_discover_complete);
+static DEFINE_FLAG(flag_write_complete);
+static DEFINE_FLAG(flag_read_complete);
 
 static struct bt_conn *g_conn;
 static uint16_t unhandled_chrc_handle;
@@ -31,7 +41,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != 0) {
-		FAIL("Failed to connect to %s (%u)\n", addr, err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, err);
 		return;
 	}
 
@@ -86,14 +96,14 @@ void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 	printk("Stopping scan\n");
 	err = bt_le_scan_stop();
 	if (err != 0) {
-		FAIL("Could not stop scan: %d");
+		TEST_FAIL("Could not stop scan: %d");
 		return;
 	}
 
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN,
 				BT_LE_CONN_PARAM_DEFAULT, &g_conn);
 	if (err != 0) {
-		FAIL("Could not connect to peer: %d", err);
+		TEST_FAIL("Could not connect to peer: %d", err);
 	}
 }
 
@@ -107,7 +117,7 @@ static uint8_t discover_func(struct bt_conn *conn,
 		if (unhandled_chrc_handle == 0 ||
 		    unauthorized_chrc_handle == 0 ||
 		    authorized_chrc_handle == 0) {
-			FAIL("Did not discover required characterstics");
+			TEST_FAIL("Did not discover required characterstics");
 		}
 
 		(void)memset(params, 0, sizeof(*params));
@@ -128,7 +138,7 @@ static uint8_t discover_func(struct bt_conn *conn,
 
 		err = bt_gatt_discover(conn, params);
 		if (err != 0) {
-			FAIL("Discover failed (err %d)\n", err);
+			TEST_FAIL("Discover failed (err %d)", err);
 		}
 
 		return BT_GATT_ITER_STOP;
@@ -168,7 +178,7 @@ static void gatt_discover(void)
 
 	err = bt_gatt_discover(g_conn, &discover_params);
 	if (err != 0) {
-		FAIL("Discover failed(err %d)\n", err);
+		TEST_FAIL("Discover failed(err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(flag_discover_complete);
@@ -179,11 +189,11 @@ static void gatt_write_cb(struct bt_conn *conn, uint8_t err,
 			  struct bt_gatt_write_params *params)
 {
 	if ((err != BT_ATT_ERR_SUCCESS) && (params->handle != unauthorized_chrc_handle)) {
-		FAIL("Write failed on authorized characteristics: 0x%02X\n", err);
+		TEST_FAIL("Write failed on authorized characteristics: 0x%02X", err);
 	}
 
 	if ((err != BT_ATT_ERR_AUTHORIZATION) && (params->handle == unauthorized_chrc_handle)) {
-		FAIL("Write failed on unauthorized characteristics: 0x%02X\n", err);
+		TEST_FAIL("Write failed on unauthorized characteristics: 0x%02X", err);
 	}
 
 	(void)memset(params, 0, sizeof(*params));
@@ -207,7 +217,7 @@ static void gatt_write(uint16_t handle)
 
 	err = bt_gatt_write(g_conn, &write_params);
 	if (err != 0) {
-		FAIL("bt_gatt_write failed: %d\n", err);
+		TEST_FAIL("bt_gatt_write failed: %d", err);
 	}
 
 	WAIT_FOR_FLAG(flag_write_complete);
@@ -231,7 +241,7 @@ static void gatt_cp_write(void)
 
 	err = bt_gatt_write(g_conn, &write_params);
 	if (err != 0) {
-		FAIL("bt_gatt_write failed: %d\n", err);
+		TEST_FAIL("bt_gatt_write failed: %d", err);
 	}
 
 	WAIT_FOR_FLAG(flag_write_complete);
@@ -244,16 +254,16 @@ static uint8_t gatt_read_cb(struct bt_conn *conn, uint8_t err,
 {
 	if ((err != BT_ATT_ERR_SUCCESS) &&
 	    (params->single.handle != unauthorized_chrc_handle)) {
-		FAIL("Read failed on authorized characteristics: 0x%02X\n", err);
+		TEST_FAIL("Read failed on authorized characteristics: 0x%02X", err);
 
 		if ((length != CHRC_SIZE) || (memcmp(data, chrc_data, length) != 0)) {
-			FAIL("chrc data different than expected", err);
+			TEST_FAIL("chrc data different than expected: 0x%02X", err);
 		}
 	}
 
 	if ((err != BT_ATT_ERR_AUTHORIZATION) &&
 	    (params->single.handle == unauthorized_chrc_handle)) {
-		FAIL("Read failed on unauthorized characteristics: 0x%02X\n", err);
+		TEST_FAIL("Read failed on unauthorized characteristics: 0x%02X", err);
 	}
 
 	(void)memset(params, 0, sizeof(*params));
@@ -279,7 +289,7 @@ static void gatt_read(uint16_t handle)
 
 	err = bt_gatt_read(g_conn, &read_params);
 	if (err != 0) {
-		FAIL("bt_gatt_read failed: %d\n", err);
+		TEST_FAIL("bt_gatt_read failed: %d", err);
 	}
 
 	WAIT_FOR_FLAG(flag_read_complete);
@@ -301,12 +311,12 @@ static void test_main(void)
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth discover failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth discover failed (err %d)", err);
 	}
 
 	err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
 	if (err != 0) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 	}
 
 	printk("Scanning successfully started\n");
@@ -324,14 +334,12 @@ static void test_main(void)
 	printk("Interacting with the authorized characteristic\n");
 	gatt_interact(authorized_chrc_handle);
 
-	PASS("GATT client Passed\n");
+	TEST_PASS("GATT client Passed");
 }
 
 static const struct bst_test_instance test_vcs[] = {
 	{
 		.test_id = "gatt_client",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/gatt/authorization/src/gatt_server_test.c b/tests/bsim/bluetooth/host/gatt/authorization/src/gatt_server_test.c
index c8a3303a8d9..4c206f7cd27 100644
--- a/tests/bsim/bluetooth/host/gatt/authorization/src/gatt_server_test.c
+++ b/tests/bsim/bluetooth/host/gatt/authorization/src/gatt_server_test.c
@@ -4,11 +4,24 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <zephyr/kernel.h>
+#include <zephyr/types.h>
+#include <stddef.h>
+#include <errno.h>
+
+#include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/uuid.h>
+#include <zephyr/bluetooth/gatt.h>
+
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 
 extern enum bst_result_t bst_result;
 
-CREATE_FLAG(flag_is_chrc_ctx_validated);
+static DEFINE_FLAG(flag_is_chrc_ctx_validated);
 
 static struct bt_conn *g_conn;
 
@@ -19,7 +32,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != 0) {
-		FAIL("Failed to connect to %s (%u)\n", addr, err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, err);
 		return;
 	}
 
@@ -87,7 +100,7 @@ static ssize_t write_test_chrc(struct test_chrc_ctx *chrc_ctx,
 	}
 
 	if (flags != 0) {
-		FAIL("Invalid flags %u\n", flags);
+		TEST_FAIL("Invalid flags %u", flags);
 		return BT_GATT_ERR(BT_ATT_ERR_UNLIKELY);
 	}
 
@@ -240,14 +253,14 @@ static ssize_t write_cp_chrc(struct bt_conn *conn,
 		pass = authorized_chrc_operation_validate();
 		log_str = "authorized";
 	} else {
-		FAIL("Invalid value of CP write counter %u\n", cp_write_cnt);
+		TEST_FAIL("Invalid value of CP write counter %u", cp_write_cnt);
 		return BT_GATT_ERR(BT_ATT_ERR_UNLIKELY);
 	}
 
 	if (pass) {
 		printk("Correct context for %s chrc\n", log_str);
 	} else {
-		FAIL("Invalid context for %s chrc\n", log_str);
+		TEST_FAIL("Invalid context for %s chrc", log_str);
 		return BT_GATT_ERR(BT_ATT_ERR_UNLIKELY);
 	}
 
@@ -327,7 +340,7 @@ static void test_main(void)
 
 	err = bt_gatt_authorization_cb_register(&gatt_authorization_callbacks);
 	if (err) {
-		FAIL("Registering GATT authorization callbacks failed (err %d)\n", err);
+		TEST_FAIL("Registering GATT authorization callbacks failed (err %d)", err);
 		return;
 	}
 
@@ -335,7 +348,7 @@ static void test_main(void)
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 		return;
 	}
 
@@ -343,7 +356,7 @@ static void test_main(void)
 
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, ad, ARRAY_SIZE(ad), NULL, 0);
 	if (err != 0) {
-		FAIL("Advertising failed to start (err %d)\n", err);
+		TEST_FAIL("Advertising failed to start (err %d)", err);
 		return;
 	}
 
@@ -351,14 +364,12 @@ static void test_main(void)
 
 	WAIT_FOR_FLAG(flag_is_chrc_ctx_validated);
 
-	PASS("GATT server passed\n");
+	TEST_PASS("GATT server passed");
 }
 
 static const struct bst_test_instance test_gatt_server[] = {
 	{
 		.test_id = "gatt_server",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/gatt/authorization/test_scripts/gatt.sh b/tests/bsim/bluetooth/host/gatt/authorization/test_scripts/gatt.sh
index 359247e08d9..c318928fbf8 100755
--- a/tests/bsim/bluetooth/host/gatt/authorization/test_scripts/gatt.sh
+++ b/tests/bsim/bluetooth/host/gatt/authorization/test_scripts/gatt.sh
@@ -17,6 +17,6 @@ Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_host_gatt_authorization_prj_conf \
   -v=${verbosity_level} -s=${simulation_id} -d=1 -testid=gatt_server
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
-  -D=2 -sim_length=60e6 $@
+  -D=2 -sim_length=30e6 $@
 
 wait_for_background_jobs
diff --git a/tests/bsim/bluetooth/host/gatt/caching/CMakeLists.txt b/tests/bsim/bluetooth/host/gatt/caching/CMakeLists.txt
index 7869a21840f..b279e8c1439 100644
--- a/tests/bsim/bluetooth/host/gatt/caching/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/gatt/caching/CMakeLists.txt
@@ -5,6 +5,9 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_gatt)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 FILE(GLOB app_sources src/*.c)
 target_sources(app PRIVATE ${app_sources} )
 
diff --git a/tests/bsim/bluetooth/host/gatt/caching/src/common.c b/tests/bsim/bluetooth/host/gatt/caching/src/common.c
deleted file mode 100644
index a7083921905..00000000000
--- a/tests/bsim/bluetooth/host/gatt/caching/src/common.c
+++ /dev/null
@@ -1,66 +0,0 @@
-/*
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "common.h"
-#include "argparse.h"
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i seconds)\n", WAIT_TIME);
-	}
-}
-
-void test_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-	bst_result = In_progress;
-}
-
-#define CHANNEL_ID 0
-#define MSG_SIZE 1
-
-void backchannel_init(void)
-{
-	uint device_number = get_device_nbr();
-	uint peer_number = device_number ^ 1;
-	uint device_numbers[] = { peer_number };
-	uint channel_numbers[] = { CHANNEL_ID };
-	uint *ch;
-
-	ch = bs_open_back_channel(device_number, device_numbers, channel_numbers,
-				  ARRAY_SIZE(channel_numbers));
-	if (!ch) {
-		FAIL("Unable to open backchannel\n");
-	}
-}
-
-void backchannel_sync_send(void)
-{
-	uint8_t sync_msg[MSG_SIZE] = { get_device_nbr() };
-
-	printk("Sending sync\n");
-	bs_bc_send_msg(CHANNEL_ID, sync_msg, ARRAY_SIZE(sync_msg));
-}
-
-void backchannel_sync_wait(void)
-{
-	uint8_t sync_msg[MSG_SIZE];
-
-	while (true) {
-		if (bs_bc_is_msg_received(CHANNEL_ID) > 0) {
-			bs_bc_receive_msg(CHANNEL_ID, sync_msg, ARRAY_SIZE(sync_msg));
-			if (sync_msg[0] != get_device_nbr()) {
-				/* Received a message from another device, exit */
-				break;
-			}
-		}
-
-		k_sleep(K_MSEC(1));
-	}
-
-	printk("Sync received\n");
-}
diff --git a/tests/bsim/bluetooth/host/gatt/caching/src/common.h b/tests/bsim/bluetooth/host/gatt/caching/src/common.h
index d01282ca035..adf5d4754a9 100644
--- a/tests/bsim/bluetooth/host/gatt/caching/src/common.h
+++ b/tests/bsim/bluetooth/host/gatt/caching/src/common.h
@@ -6,50 +6,6 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <zephyr/kernel.h>
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "time_machine.h"
-#include "bstests.h"
-#include "bs_pc_backchannel.h"
-
-#include <zephyr/types.h>
-#include <stddef.h>
-#include <errno.h>
-
-#include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/bluetooth/hci.h>
-#include <zephyr/bluetooth/conn.h>
-#include <zephyr/bluetooth/uuid.h>
-#include <zephyr/bluetooth/gatt.h>
-
-extern enum bst_result_t bst_result;
-
-#define WAIT_TIME (60 * 1e6) /*seconds*/
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define UNSET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)false)
-#define WAIT_FOR_FLAG(flag) \
-	while (!(bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-
-#define FAIL(...) \
-	do { \
-		bst_result = Failed; \
-		bs_trace_error_time_line(__VA_ARGS__); \
-	} while (0)
-
-#define PASS(...) \
-	do { \
-		bst_result = Passed; \
-		bs_trace_info_time(1, __VA_ARGS__); \
-	} while (0)
-
-#define CHRC_SIZE 10
-
 #define TEST_SERVICE_UUID \
 	BT_UUID_DECLARE_128(0x01, 0x23, 0x45, 0x67, 0x89, 0x01, 0x02, 0x03, \
 			    0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x00, 0x00)
@@ -61,9 +17,3 @@ extern enum bst_result_t bst_result;
 #define TEST_ADDITIONAL_CHRC_UUID \
 	BT_UUID_DECLARE_128(0x01, 0x23, 0x45, 0x67, 0x89, 0x01, 0x02, 0x03, \
 			    0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0xFF, 0x11)
-
-void test_tick(bs_time_t HW_device_time);
-void test_init(void);
-void backchannel_init(void);
-void backchannel_sync_send(void);
-void backchannel_sync_wait(void);
diff --git a/tests/bsim/bluetooth/host/gatt/caching/src/gatt_client_test.c b/tests/bsim/bluetooth/host/gatt/caching/src/gatt_client_test.c
index 3699f80e09b..65d9b0213c0 100644
--- a/tests/bsim/bluetooth/host/gatt/caching/src/gatt_client_test.c
+++ b/tests/bsim/bluetooth/host/gatt/caching/src/gatt_client_test.c
@@ -4,18 +4,29 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <zephyr/kernel.h>
+#include <zephyr/types.h>
+#include <stddef.h>
+#include <errno.h>
+
 #include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/uuid.h>
 #include <zephyr/bluetooth/gatt.h>
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
+#include "babblekit/sync.h"
 #include "common.h"
 
-CREATE_FLAG(flag_is_connected);
-CREATE_FLAG(flag_discover_complete);
-CREATE_FLAG(flag_write_complete);
-CREATE_FLAG(flag_chan_1_read);
-CREATE_FLAG(flag_chan_2_read);
-CREATE_FLAG(flag_db_hash_read);
-CREATE_FLAG(flag_encrypted);
+static DEFINE_FLAG(flag_is_connected);
+static DEFINE_FLAG(flag_discover_complete);
+static DEFINE_FLAG(flag_write_complete);
+static DEFINE_FLAG(flag_chan_1_read);
+static DEFINE_FLAG(flag_chan_2_read);
+static DEFINE_FLAG(flag_db_hash_read);
+static DEFINE_FLAG(flag_encrypted);
 
 static struct bt_conn *g_conn;
 static uint16_t chrc_handle;
@@ -29,7 +40,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != 0) {
-		FAIL("Failed to connect to %s (%u)\n", addr, err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, err);
 
 		return;
 	}
@@ -60,9 +71,9 @@ static void disconnected(struct bt_conn *conn, uint8_t reason)
 void security_changed(struct bt_conn *conn, bt_security_t level, enum bt_security_err err)
 {
 	if (err != BT_SECURITY_ERR_SUCCESS) {
-		FAIL("Encryption failed\n");
+		TEST_FAIL("Encryption failed");
 	} else if (level < BT_SECURITY_L2) {
-		FAIL("Insufficient security\n");
+		TEST_FAIL("Insufficient security");
 	} else {
 		SET_FLAG(flag_encrypted);
 	}
@@ -94,14 +105,14 @@ void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type, struct ne
 	printk("Stopping scan\n");
 	err = bt_le_scan_stop();
 	if (err != 0) {
-		FAIL("Could not stop scan (err %d)\n");
+		TEST_FAIL("Could not stop scan (err %d)");
 
 		return;
 	}
 
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, BT_LE_CONN_PARAM_DEFAULT, &g_conn);
 	if (err != 0) {
-		FAIL("Could not connect to peer (err %d)", err);
+		TEST_FAIL("Could not connect to peer (err %d)", err);
 	}
 }
 
@@ -112,7 +123,7 @@ static uint8_t discover_func(struct bt_conn *conn, const struct bt_gatt_attr *at
 
 	if (attr == NULL) {
 		if (chrc_handle == 0) {
-			FAIL("Did not discover chrc (%x)\n", chrc_handle);
+			TEST_FAIL("Did not discover chrc (%x)", chrc_handle);
 		}
 
 		(void)memset(params, 0, sizeof(*params));
@@ -133,7 +144,7 @@ static uint8_t discover_func(struct bt_conn *conn, const struct bt_gatt_attr *at
 
 		err = bt_gatt_discover(conn, params);
 		if (err != 0) {
-			FAIL("Discover failed (err %d)\n", err);
+			TEST_FAIL("Discover failed (err %d)", err);
 		}
 
 		return BT_GATT_ITER_STOP;
@@ -171,7 +182,7 @@ static void gatt_discover(const struct bt_uuid *uuid, uint8_t type)
 
 	err = bt_gatt_discover(g_conn, &discover_params);
 	if (err != 0) {
-		FAIL("Discover failed(err %d)\n", err);
+		TEST_FAIL("Discover failed (err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(flag_discover_complete);
@@ -203,10 +214,10 @@ static struct bt_gatt_read_params db_hash_read = {
 	.chan_opt = BT_ATT_CHAN_OPT_NONE,
 };
 
-void expect_status(uint8_t err, uint8_t status)
+static void expect_status(uint8_t err, uint8_t status)
 {
 	if (err != status) {
-		FAIL("Unexpected status from read: 0x%02X, expected 0x%02X\n", err, status);
+		TEST_FAIL("Unexpected status from read: 0x%02X, expected 0x%02X", err, status);
 	}
 }
 
@@ -224,7 +235,7 @@ static uint8_t gatt_read_expect_success_cb(struct bt_conn *conn, uint8_t err,
 	} else if (params == &chan_2_read) {
 		SET_FLAG(flag_chan_2_read);
 	} else {
-		FAIL("Unexpected params\n");
+		TEST_FAIL("Unexpected params");
 	}
 
 	return 0;
@@ -242,7 +253,7 @@ static uint8_t gatt_read_expect_err_unlikely_cb(struct bt_conn *conn, uint8_t er
 	} else if (params == &chan_2_read) {
 		SET_FLAG(flag_chan_2_read);
 	} else {
-		FAIL("Unexpected params\n");
+		TEST_FAIL("Unexpected params");
 	}
 
 	return 0;
@@ -260,7 +271,7 @@ static uint8_t gatt_read_expect_err_out_of_sync_cb(struct bt_conn *conn, uint8_t
 	} else if (params == &chan_2_read) {
 		SET_FLAG(flag_chan_2_read);
 	} else {
-		FAIL("Unexpected params\n");
+		TEST_FAIL("Unexpected params");
 	}
 
 	return 0;
@@ -274,14 +285,14 @@ static void gatt_read(struct bt_gatt_read_params *read_params)
 
 	err = bt_gatt_read(g_conn, read_params);
 	if (err != 0) {
-		FAIL("bt_gatt_read failed: %d\n", err);
+		TEST_FAIL("bt_gatt_read failed: %d", err);
 	}
 }
 
 static void write_cb(struct bt_conn *conn, uint8_t err, struct bt_gatt_write_params *params)
 {
 	if (err != BT_ATT_ERR_SUCCESS) {
-		FAIL("Write failed: 0x%02X\n", err);
+		TEST_FAIL("Write failed: 0x%02X", err);
 	}
 
 	SET_FLAG(flag_write_complete);
@@ -310,7 +321,7 @@ static void enable_robust_caching(void)
 
 	err = bt_gatt_write(g_conn, &write_params);
 	if (err) {
-		FAIL("bt_gatt_write failed (err %d)\n", err);
+		TEST_FAIL("bt_gatt_write failed (err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(flag_write_complete);
@@ -321,16 +332,16 @@ static void test_main_common(bool connect_eatt)
 {
 	int err;
 
-	backchannel_init();
+	TEST_ASSERT(bk_sync_init() == 0, "Failed to open backchannel");
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth discover failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth discover failed (err %d)", err);
 	}
 
 	err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
 	if (err != 0) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 	}
 
 	printk("Scanning successfully started\n");
@@ -339,7 +350,7 @@ static void test_main_common(bool connect_eatt)
 
 	err = bt_conn_set_security(g_conn, BT_SECURITY_L2);
 	if (err) {
-		FAIL("Failed to start encryption procedure\n");
+		TEST_FAIL("Failed to start encryption procedure");
 	}
 
 	WAIT_FOR_FLAG(flag_encrypted);
@@ -357,10 +368,10 @@ static void test_main_common(bool connect_eatt)
 	}
 
 	/* Tell the server to register additional service */
-	backchannel_sync_send();
+	bk_sync_send();
 
 	/* Wait for new service to be added by server */
-	backchannel_sync_wait();
+	bk_sync_wait();
 
 	chan_1_read.single.handle = chrc_handle;
 	chan_2_read.single.handle = chrc_handle;
@@ -386,9 +397,9 @@ static void test_main_db_hash_read_eatt(void)
 	WAIT_FOR_FLAG(flag_chan_2_read);
 
 	/* Signal to server that reads are done */
-	backchannel_sync_send();
+	bk_sync_send();
 
-	PASS("GATT client Passed\n");
+	TEST_PASS("GATT client Passed");
 }
 
 static void test_main_out_of_sync_eatt(void)
@@ -423,9 +434,9 @@ static void test_main_out_of_sync_eatt(void)
 	WAIT_FOR_FLAG(flag_chan_2_read);
 
 	/* Signal to server that reads are done */
-	backchannel_sync_send();
+	bk_sync_send();
 
-	PASS("GATT client Passed\n");
+	TEST_PASS("GATT client Passed");
 }
 
 static void test_main_retry_reads_eatt(void)
@@ -455,9 +466,9 @@ static void test_main_retry_reads_eatt(void)
 	WAIT_FOR_FLAG(flag_chan_2_read);
 
 	/* Signal to server that reads are done */
-	backchannel_sync_send();
+	bk_sync_send();
 
-	PASS("GATT client Passed\n");
+	TEST_PASS("GATT client Passed");
 }
 
 static void test_main_db_hash_read_no_eatt(void)
@@ -476,9 +487,9 @@ static void test_main_db_hash_read_no_eatt(void)
 	WAIT_FOR_FLAG(flag_chan_1_read);
 
 	/* Signal to server that reads are done */
-	backchannel_sync_send();
+	bk_sync_send();
 
-	PASS("GATT client Passed\n");
+	TEST_PASS("GATT client Passed");
 }
 
 static void test_main_out_of_sync_no_eatt(void)
@@ -501,9 +512,9 @@ static void test_main_out_of_sync_no_eatt(void)
 	WAIT_FOR_FLAG(flag_chan_1_read);
 
 	/* Signal to server that reads are done */
-	backchannel_sync_send();
+	bk_sync_send();
 
-	PASS("GATT client Passed\n");
+	TEST_PASS("GATT client Passed");
 }
 
 static void test_main_retry_reads_no_eatt(void)
@@ -521,46 +532,34 @@ static void test_main_retry_reads_no_eatt(void)
 	WAIT_FOR_FLAG(flag_chan_1_read);
 
 	/* Signal to server that reads are done */
-	backchannel_sync_send();
+	bk_sync_send();
 
-	PASS("GATT client Passed\n");
+	TEST_PASS("GATT client Passed");
 }
 
 static const struct bst_test_instance test_vcs[] = {
 	{
 		.test_id = "gatt_client_db_hash_read_eatt",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_db_hash_read_eatt,
 	},
 	{
 		.test_id = "gatt_client_out_of_sync_eatt",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_out_of_sync_eatt,
 	},
 	{
 		.test_id = "gatt_client_retry_reads_eatt",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_retry_reads_eatt,
 	},
 	{
 		.test_id = "gatt_client_db_hash_read_no_eatt",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_db_hash_read_no_eatt,
 	},
 	{
 		.test_id = "gatt_client_out_of_sync_no_eatt",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_out_of_sync_no_eatt,
 	},
 	{
 		.test_id = "gatt_client_retry_reads_no_eatt",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_retry_reads_no_eatt,
 	},
 	BSTEST_END_MARKER,
diff --git a/tests/bsim/bluetooth/host/gatt/caching/src/gatt_server_test.c b/tests/bsim/bluetooth/host/gatt/caching/src/gatt_server_test.c
index 637b7037e2f..1cb88b489fb 100644
--- a/tests/bsim/bluetooth/host/gatt/caching/src/gatt_server_test.c
+++ b/tests/bsim/bluetooth/host/gatt/caching/src/gatt_server_test.c
@@ -4,12 +4,26 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <zephyr/kernel.h>
+#include <zephyr/types.h>
+#include <stddef.h>
+#include <errno.h>
+
+#include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/uuid.h>
+#include <zephyr/bluetooth/gatt.h>
+
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
+#include "babblekit/sync.h"
 #include "common.h"
 
 extern enum bst_result_t bst_result;
 
-CREATE_FLAG(flag_is_connected);
-CREATE_FLAG(flag_is_encrypted);
+static DEFINE_FLAG(flag_is_connected);
+static DEFINE_FLAG(flag_is_encrypted);
 
 static struct bt_conn *g_conn;
 
@@ -20,7 +34,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != 0) {
-		FAIL("Failed to connect to %s (%u)\n", addr, err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, err);
 
 		return;
 	}
@@ -63,6 +77,7 @@ BT_CONN_CB_DEFINE(conn_callbacks) = {
 	.security_changed = security_changed,
 };
 
+#define CHRC_SIZE 10
 #define ARRAY_ITEM(i, _) i
 static const uint8_t chrc_data[] = { LISTIFY(CHRC_SIZE, ARRAY_ITEM, (,)) }; /* 1, 2, 3 ... */
 
@@ -90,11 +105,11 @@ static void test_main_common(bool connect_eatt)
 	const struct bt_data ad[] = { BT_DATA_BYTES(BT_DATA_FLAGS,
 						    (BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR)) };
 
-	backchannel_init();
+	TEST_ASSERT(bk_sync_init() == 0, "Failed to open backchannel");
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 
 		return;
 	}
@@ -103,7 +118,7 @@ static void test_main_common(bool connect_eatt)
 
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, ad, ARRAY_SIZE(ad), NULL, 0);
 	if (err != 0) {
-		FAIL("Advertising failed to start (err %d)\n", err);
+		TEST_FAIL("Advertising failed to start (err %d)", err);
 
 		return;
 	}
@@ -117,28 +132,28 @@ static void test_main_common(bool connect_eatt)
 
 		err = bt_eatt_connect(g_conn, CONFIG_BT_EATT_MAX);
 		if (err) {
-			FAIL("Failed to connect EATT channels (err %d)\n", err);
+			TEST_FAIL("Failed to connect EATT channels (err %d)", err);
 
 			return;
 		}
 	}
 
 	/* Wait for client to do discovery and configuration */
-	backchannel_sync_wait();
+	bk_sync_wait();
 
 	printk("Registering additional service\n");
 	err = bt_gatt_service_register(&additional_gatt_service);
 	if (err < 0) {
-		FAIL("Registering additional service failed (err %d)\n", err);
+		TEST_FAIL("Registering additional service failed (err %d)", err);
 	}
 
 	/* Signal to client that additional service is registered */
-	backchannel_sync_send();
+	bk_sync_send();
 
 	/* Wait for client to be done reading */
-	backchannel_sync_wait();
+	bk_sync_wait();
 
-	PASS("GATT server passed\n");
+	TEST_PASS("GATT server passed");
 }
 
 static void test_main_eatt(void)
@@ -154,14 +169,10 @@ static void test_main_no_eatt(void)
 static const struct bst_test_instance test_gatt_server[] = {
 	{
 		.test_id = "gatt_server_eatt",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_eatt,
 	},
 	{
 		.test_id = "gatt_server_no_eatt",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_no_eatt,
 	},
 	BSTEST_END_MARKER,
diff --git a/tests/bsim/bluetooth/host/gatt/ccc_store/CMakeLists.txt b/tests/bsim/bluetooth/host/gatt/ccc_store/CMakeLists.txt
index 832d770fbd9..35f8186b3ec 100644
--- a/tests/bsim/bluetooth/host/gatt/ccc_store/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/gatt/ccc_store/CMakeLists.txt
@@ -12,9 +12,11 @@ endif()
 find_package(Zephyr HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_ccc_store)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 target_sources(app PRIVATE
   src/main.c
-  src/common.c
 
   src/central.c
   src/peripheral.c
diff --git a/tests/bsim/bluetooth/host/gatt/ccc_store/src/central.c b/tests/bsim/bluetooth/host/gatt/ccc_store/src/central.c
index 0784a5e587d..a4f056dd408 100644
--- a/tests/bsim/bluetooth/host/gatt/ccc_store/src/central.c
+++ b/tests/bsim/bluetooth/host/gatt/ccc_store/src/central.c
@@ -22,14 +22,17 @@
 #include "settings.h"
 
 #include "argparse.h"
-#include "bs_pc_backchannel.h"
+
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
+#include "babblekit/sync.h"
 
 #define SERVER_CHAN 0
 
-CREATE_FLAG(connected_flag);
-CREATE_FLAG(disconnected_flag);
-CREATE_FLAG(security_updated_flag);
-CREATE_FLAG(notification_received_flag);
+static DEFINE_FLAG(connected_flag);
+static DEFINE_FLAG(disconnected_flag);
+static DEFINE_FLAG(security_updated_flag);
+static DEFINE_FLAG(notification_received_flag);
 
 #define BT_UUID_DUMMY_SERVICE BT_UUID_DECLARE_128(DUMMY_SERVICE_TYPE)
 #define BT_UUID_DUMMY_SERVICE_NOTIFY BT_UUID_DECLARE_128(DUMMY_SERVICE_NOTIFY_TYPE)
@@ -38,7 +41,7 @@ static struct bt_conn *default_conn;
 
 static struct bt_conn_cb central_cb;
 
-CREATE_FLAG(gatt_subscribed_flag);
+static DEFINE_FLAG(gatt_subscribed_flag);
 
 static uint8_t notify_cb(struct bt_conn *conn, struct bt_gatt_subscribe_params *params,
 			 const void *data, uint16_t length)
@@ -88,7 +91,7 @@ static void ccc_subscribe(void)
 
 	err = bt_gatt_subscribe(default_conn, &subscribe_params);
 	if (err) {
-		FAIL("Failed to subscribe (att err %d)", err);
+		TEST_FAIL("Failed to subscribe (att err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(gatt_subscribed_flag);
@@ -106,13 +109,13 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 
 	err = bt_le_scan_stop();
 	if (err) {
-		FAIL("Failed to stop scanner (err %d)\n", err);
+		TEST_FAIL("Failed to stop scanner (err %d)", err);
 	}
 
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, BT_LE_CONN_PARAM_DEFAULT,
 				&default_conn);
 	if (err) {
-		FAIL("Could not connect to peer: %s (err %d)\n", addr_str, err);
+		TEST_FAIL("Could not connect to peer: %s (err %d)", addr_str, err);
 	}
 }
 
@@ -125,7 +128,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(addr, addr_str, sizeof(addr_str));
 
 	if (err) {
-		FAIL("Failed to connect to %s (err %d)\n", addr_str, err);
+		TEST_FAIL("Failed to connect to %s (err %d)", addr_str, err);
 	}
 
 	LOG_DBG("Connected: %s", addr_str);
@@ -173,7 +176,7 @@ static void start_scan(void)
 
 	err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
 	if (err) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 	}
 
 	LOG_DBG("Scanning successfully started");
@@ -185,7 +188,7 @@ static void disconnect(void)
 
 	err = bt_conn_disconnect(default_conn, BT_HCI_ERR_REMOTE_USER_TERM_CONN);
 	if (err) {
-		FAIL("Disconnection failed (err %d)\n", err);
+		TEST_FAIL("Disconnection failed (err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(disconnected_flag);
@@ -205,7 +208,7 @@ static void connect_pair_subscribe(void)
 
 	err = bt_conn_set_security(default_conn, BT_SECURITY_L2);
 	if (err != 0) {
-		FAIL("Failed to set security (err %d)\n", err);
+		TEST_FAIL("Failed to set security (err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(security_updated_flag);
@@ -215,9 +218,9 @@ static void connect_pair_subscribe(void)
 	ccc_subscribe();
 
 	/* confirm to server that we subscribed */
-	backchannel_sync_send(SERVER_CHAN, SERVER_ID);
+	bk_sync_send();
 	/* wait for server to check that the subscribtion is well registered */
-	backchannel_sync_wait(SERVER_CHAN, SERVER_ID);
+	bk_sync_wait();
 
 	WAIT_FOR_FLAG(notification_received_flag);
 	UNSET_FLAG(notification_received_flag);
@@ -234,21 +237,21 @@ static void connect_restore_sec(void)
 
 	err = bt_conn_set_security(default_conn, BT_SECURITY_L2);
 	if (err != 0) {
-		FAIL("Failed to set security (err %d)\n", err);
+		TEST_FAIL("Failed to set security (err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(security_updated_flag);
 	UNSET_FLAG(security_updated_flag);
 
 	/* check local subscription state */
-	if (GET_FLAG(gatt_subscribed_flag) == false) {
-		FAIL("Not subscribed\n");
+	if (!IS_FLAG_SET(gatt_subscribed_flag)) {
+		TEST_FAIL("Not subscribed");
 	}
 
 	/* notify the end of security update to server */
-	backchannel_sync_send(SERVER_CHAN, SERVER_ID);
+	bk_sync_send();
 	/* wait for server to check that the subscribtion has been restored */
-	backchannel_sync_wait(SERVER_CHAN, SERVER_ID);
+	bk_sync_wait();
 
 	WAIT_FOR_FLAG(notification_received_flag);
 	UNSET_FLAG(notification_received_flag);
@@ -256,26 +259,6 @@ static void connect_restore_sec(void)
 
 /* Util functions */
 
-void central_backchannel_init(void)
-{
-	uint device_number = get_device_nbr();
-	uint channel_numbers[1] = {
-		0,
-	};
-	uint device_numbers[1];
-	uint num_ch = 1;
-	uint *ch;
-
-	device_numbers[0] = SERVER_ID;
-
-	LOG_DBG("Opening back channels for device %d", device_number);
-	ch = bs_open_back_channel(device_number, device_numbers, channel_numbers, num_ch);
-	if (!ch) {
-		FAIL("Unable to open backchannel\n");
-	}
-	LOG_DBG("Back channels for device %d opened", device_number);
-}
-
 static void set_public_addr(void)
 {
 	bt_addr_le_t addr = {BT_ADDR_LE_RANDOM, {{0x0A, 0x89, 0x67, 0x45, 0x23, 0xC1}}};
@@ -293,12 +276,12 @@ void run_central(int times)
 	central_cb.disconnected = disconnected;
 	central_cb.security_changed = security_changed;
 
-	central_backchannel_init();
+	TEST_ASSERT(bk_sync_init() == 0);
 	set_public_addr();
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 	}
 
 	LOG_DBG("Bluetooth initialized");
@@ -307,12 +290,12 @@ void run_central(int times)
 
 	err = settings_load();
 	if (err) {
-		FAIL("Settings load failed (err %d)\n", err);
+		TEST_FAIL("Settings load failed (err %d)", err);
 	}
 
 	err = bt_unpair(BT_ID_DEFAULT, BT_ADDR_LE_ANY);
 	if (err) {
-		FAIL("Unpairing failed (err %d)\n", err);
+		TEST_FAIL("Unpairing failed (err %d)", err);
 	}
 
 	connect_pair_subscribe();
@@ -323,5 +306,5 @@ void run_central(int times)
 		disconnect();
 	}
 
-	PASS("Central test passed\n");
+	TEST_PASS("Central test passed");
 }
diff --git a/tests/bsim/bluetooth/host/gatt/ccc_store/src/common.c b/tests/bsim/bluetooth/host/gatt/ccc_store/src/common.c
deleted file mode 100644
index 7c9c898bc55..00000000000
--- a/tests/bsim/bluetooth/host/gatt/ccc_store/src/common.c
+++ /dev/null
@@ -1,38 +0,0 @@
-/* Copyright (c) 2023 Nordic Semiconductor ASA
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <stdint.h>
-
-#include "common.h"
-
-#include "argparse.h"
-#include "bs_pc_backchannel.h"
-
-void backchannel_sync_send(uint channel, uint device_nbr)
-{
-	uint8_t sync_msg[BC_MSG_SIZE] = {get_device_nbr(), device_nbr}; /* src, dst */
-
-	bs_bc_send_msg(channel, sync_msg, ARRAY_SIZE(sync_msg));
-}
-
-void backchannel_sync_wait(uint channel, uint device_nbr)
-{
-	uint8_t sync_msg[BC_MSG_SIZE];
-
-	LOG_DBG("Wait for %d on channel %d", device_nbr, channel);
-
-	while (true) {
-		if (bs_bc_is_msg_received(channel) > 0) {
-			bs_bc_receive_msg(channel, sync_msg, ARRAY_SIZE(sync_msg));
-
-			if (sync_msg[0] == device_nbr && sync_msg[1] == get_device_nbr()) {
-				break;
-			}
-		}
-
-		k_msleep(1);
-	}
-
-	LOG_DBG("Sync received");
-}
diff --git a/tests/bsim/bluetooth/host/gatt/ccc_store/src/common.h b/tests/bsim/bluetooth/host/gatt/ccc_store/src/common.h
index c4c8f9c4ff0..8f3dcfb29f2 100644
--- a/tests/bsim/bluetooth/host/gatt/ccc_store/src/common.h
+++ b/tests/bsim/bluetooth/host/gatt/ccc_store/src/common.h
@@ -2,39 +2,8 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <zephyr/kernel.h>
-
-#include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/settings/settings.h>
-
 #include <zephyr/logging/log.h>
 
-#include "bs_tracing.h"
-#include "bstests.h"
-
-#define FAIL(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Failed;                                                               \
-		bs_trace_error_time_line(__VA_ARGS__);                                             \
-	} while (0)
-
-#define PASS(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Passed;                                                               \
-		bs_trace_info_time(1, __VA_ARGS__);                                                \
-	} while (0)
-
-extern enum bst_result_t bst_result;
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t) false
-#define SET_FLAG(flag)	  (void)atomic_set(&flag, (atomic_t) true)
-#define GET_FLAG(flag)	  (bool)atomic_get(&flag)
-#define UNSET_FLAG(flag)  (void)atomic_set(&flag, (atomic_t) false)
-#define WAIT_FOR_FLAG(flag)                                                                        \
-	while (!(bool)atomic_get(&flag)) {                                                         \
-		(void)k_sleep(K_MSEC(1));                                                          \
-	}
-
 LOG_MODULE_DECLARE(bt_bsim_ccc_store, LOG_LEVEL_DBG);
 
 #define DUMMY_SERVICE_TYPE    BT_UUID_128_ENCODE(0x2e2b8dc3, 0x06e0, 0x4f93, 0x9bb2, 0x734091c356f0)
@@ -46,11 +15,3 @@ LOG_MODULE_DECLARE(bt_bsim_ccc_store, LOG_LEVEL_DBG);
 
 #define VAL_HANDLE 18
 #define CCC_HANDLE 19
-
-#define BC_MSG_SIZE 2
-
-#define CLIENT_ID 0
-#define SERVER_ID 1
-
-void backchannel_sync_send(uint channel, uint device_nbr);
-void backchannel_sync_wait(uint channel, uint device_nbr);
diff --git a/tests/bsim/bluetooth/host/gatt/ccc_store/src/main.c b/tests/bsim/bluetooth/host/gatt/ccc_store/src/main.c
index fb47ef4c068..d37c1314e26 100644
--- a/tests/bsim/bluetooth/host/gatt/ccc_store/src/main.c
+++ b/tests/bsim/bluetooth/host/gatt/ccc_store/src/main.c
@@ -4,32 +4,13 @@
 
 #include <zephyr/kernel.h>
 
-#include "bs_types.h"
-#include "bs_tracing.h"
 #include "bstests.h"
-#include <string.h>
+#include <stdlib.h>
 
 #include <zephyr/logging/log.h>
 
 LOG_MODULE_REGISTER(bt_bsim_ccc_store, LOG_LEVEL_DBG);
 
-#define FAIL(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Failed;                                                               \
-		bs_trace_error_time_line(__VA_ARGS__);                                             \
-	} while (0)
-
-#define PASS(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Passed;                                                               \
-		bs_trace_info_time(1, __VA_ARGS__);                                                \
-	} while (0)
-
-extern enum bst_result_t bst_result;
-
-#define WAIT_TIME_S 60
-#define WAIT_TIME   (WAIT_TIME_S * 1e6)
-
 static int n_times;
 
 extern void run_peripheral(int times);
@@ -45,41 +26,23 @@ static void peripheral_main(void)
 	run_peripheral(n_times);
 }
 
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		bst_result = Failed;
-		bs_trace_error_time_line("Test failed (not passed after %d seconds)\n",
-					 WAIT_TIME_S);
-	}
-}
-
 static void test_args(int argc, char **argv)
 {
 	__ASSERT(argc == 1, "Please specify only 1 test argument\n");
 
-	n_times = atol(argv[0]);
-}
-
-static void test_ccc_store_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
+	n_times = strtol(argv[0], NULL, 10);
 }
 
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "central",
 		.test_descr = "Central device",
-		.test_pre_init_f = test_ccc_store_init,
-		.test_tick_f = test_tick,
 		.test_main_f = central_main,
 		.test_args_f = test_args,
 	},
 	{
 		.test_id = "peripheral",
 		.test_descr = "Peripheral device",
-		.test_pre_init_f = test_ccc_store_init,
-		.test_tick_f = test_tick,
 		.test_main_f = peripheral_main,
 		.test_args_f = test_args,
 	},
diff --git a/tests/bsim/bluetooth/host/gatt/ccc_store/src/peripheral.c b/tests/bsim/bluetooth/host/gatt/ccc_store/src/peripheral.c
index 873685ecd4f..6205306306b 100644
--- a/tests/bsim/bluetooth/host/gatt/ccc_store/src/peripheral.c
+++ b/tests/bsim/bluetooth/host/gatt/ccc_store/src/peripheral.c
@@ -20,15 +20,17 @@
 #include "settings.h"
 
 #include "argparse.h"
-#include "bs_pc_backchannel.h"
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
+#include "babblekit/sync.h"
 
 #define CLIENT_CHAN 0
 
-CREATE_FLAG(connected_flag);
-CREATE_FLAG(disconnected_flag);
-CREATE_FLAG(security_updated_flag);
+static DEFINE_FLAG(connected_flag);
+static DEFINE_FLAG(disconnected_flag);
+static DEFINE_FLAG(security_updated_flag);
 
-CREATE_FLAG(ccc_cfg_changed_flag);
+static DEFINE_FLAG(ccc_cfg_changed_flag);
 
 static const struct bt_uuid_128 dummy_service = BT_UUID_INIT_128(DUMMY_SERVICE_TYPE);
 
@@ -61,7 +63,7 @@ static void create_adv(struct bt_le_ext_adv **adv)
 
 	err = bt_le_ext_adv_create(BT_LE_ADV_CONN_FAST_1, NULL, adv);
 	if (err) {
-		FAIL("Failed to create advertiser (%d)\n", err);
+		TEST_FAIL("Failed to create advertiser (%d)", err);
 	}
 }
 
@@ -78,7 +80,7 @@ static void start_adv(struct bt_le_ext_adv *adv)
 
 	err = bt_le_ext_adv_start(adv, &start_params);
 	if (err) {
-		FAIL("Failed to start advertiser (err %d)\n", err);
+		TEST_FAIL("Failed to start advertiser (err %d)", err);
 	}
 
 	LOG_DBG("Advertiser started");
@@ -90,7 +92,7 @@ static void stop_adv(struct bt_le_ext_adv *adv)
 
 	err = bt_le_ext_adv_stop(adv);
 	if (err) {
-		FAIL("Failed to stop advertiser (err %d)\n", err);
+		TEST_FAIL("Failed to stop advertiser (err %d)", err);
 	}
 }
 
@@ -101,7 +103,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr_str, sizeof(addr_str));
 
 	if (err) {
-		FAIL("Failed to connect to %s (err %d)\n", addr_str, err);
+		TEST_FAIL("Failed to connect to %s (err %d)", addr_str, err);
 	}
 
 	LOG_DBG("Connected: %s", addr_str);
@@ -160,7 +162,7 @@ static void send_value_notification(void)
 
 	err = bt_gatt_notify(default_conn, attr, &value, sizeof(value));
 	if (err != 0) {
-		FAIL("Failed to send notification (err %d)\n", err);
+		TEST_FAIL("Failed to send notification (err %d)", err);
 	}
 
 	value++;
@@ -176,17 +178,17 @@ static void connect_pair_check_subscribtion(struct bt_le_ext_adv *adv)
 	UNSET_FLAG(security_updated_flag);
 
 	/* wait for confirmation of subscribtion from good client */
-	backchannel_sync_wait(CLIENT_CHAN, CLIENT_ID);
+	bk_sync_wait();
 
 	/* check that subscribtion request did not fail */
 	if (!is_peer_subscribed(default_conn)) {
-		FAIL("Client did not subscribed\n");
+		TEST_FAIL("Client did not subscribed");
 	}
 
 	stop_adv(adv);
 
 	/* confirm to client that the subscribtion has been well registered */
-	backchannel_sync_send(CLIENT_CHAN, CLIENT_ID);
+	bk_sync_send();
 
 	send_value_notification();
 }
@@ -201,42 +203,23 @@ static void connect_restore_sec_check_subscribtion(struct bt_le_ext_adv *adv)
 	UNSET_FLAG(security_updated_flag);
 
 	/* wait for client end of security update */
-	backchannel_sync_wait(CLIENT_CHAN, CLIENT_ID);
+	bk_sync_wait();
 
 	/* check that subscribtion has been restored */
 	if (!is_peer_subscribed(default_conn)) {
-		FAIL("Client is not subscribed\n");
+		TEST_FAIL("Client is not subscribed");
 	} else {
 		LOG_DBG("Client is subscribed");
 	}
 
 	/* confirm to good client that the subscribtion has been well restored */
-	backchannel_sync_send(CLIENT_CHAN, CLIENT_ID);
+	bk_sync_send();
 
 	send_value_notification();
 }
 
 /* Util functions */
 
-void peripheral_backchannel_init(void)
-{
-	uint device_number = get_device_nbr();
-	uint channel_numbers[1] = {
-		0,
-	};
-	uint device_numbers[1] = {
-		CLIENT_ID,
-	};
-	uint num_ch = 1;
-	uint *ch;
-
-	LOG_DBG("Opening back channels for device %d", device_number);
-	ch = bs_open_back_channel(device_number, device_numbers, channel_numbers, num_ch);
-	if (!ch) {
-		FAIL("Unable to open backchannel\n");
-	}
-}
-
 static void check_ccc_handle(void)
 {
 	struct bt_gatt_attr *service_notify_attr =
@@ -269,11 +252,11 @@ void run_peripheral(int times)
 	peripheral_cb.disconnected = disconnected;
 	peripheral_cb.security_changed = security_changed;
 
-	peripheral_backchannel_init();
+	TEST_ASSERT(bk_sync_init() == 0);
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 	}
 
 	LOG_DBG("Bluetooth initialized");
@@ -284,12 +267,12 @@ void run_peripheral(int times)
 
 	err = settings_load();
 	if (err) {
-		FAIL("Settings load failed (err %d)\n", err);
+		TEST_FAIL("Settings load failed (err %d)", err);
 	}
 
 	err = bt_unpair(BT_ID_DEFAULT, BT_ADDR_LE_ANY);
 	if (err) {
-		FAIL("Unpairing failed (err %d)\n", err);
+		TEST_FAIL("Unpairing failed (err %d)", err);
 	}
 
 	create_adv(&adv);
@@ -302,5 +285,5 @@ void run_peripheral(int times)
 		WAIT_FOR_FLAG(disconnected_flag);
 	}
 
-	PASS("Peripheral test passed\n");
+	TEST_PASS("Peripheral test passed");
 }
diff --git a/tests/bsim/bluetooth/host/gatt/general/CMakeLists.txt b/tests/bsim/bluetooth/host/gatt/general/CMakeLists.txt
index 7869a21840f..b279e8c1439 100644
--- a/tests/bsim/bluetooth/host/gatt/general/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/gatt/general/CMakeLists.txt
@@ -5,6 +5,9 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_gatt)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 FILE(GLOB app_sources src/*.c)
 target_sources(app PRIVATE ${app_sources} )
 
diff --git a/tests/bsim/bluetooth/host/gatt/general/src/common.c b/tests/bsim/bluetooth/host/gatt/general/src/common.c
deleted file mode 100644
index df438607c5f..00000000000
--- a/tests/bsim/bluetooth/host/gatt/general/src/common.c
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "common.h"
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i seconds)\n", WAIT_TIME);
-	}
-}
-
-void test_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-	bst_result = In_progress;
-}
diff --git a/tests/bsim/bluetooth/host/gatt/general/src/common.h b/tests/bsim/bluetooth/host/gatt/general/src/common.h
index b37e7aec46c..eb8fa59eb63 100644
--- a/tests/bsim/bluetooth/host/gatt/general/src/common.h
+++ b/tests/bsim/bluetooth/host/gatt/general/src/common.h
@@ -6,47 +6,6 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <zephyr/kernel.h>
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "time_machine.h"
-#include "bstests.h"
-
-#include <zephyr/types.h>
-#include <stddef.h>
-#include <errno.h>
-
-#include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/bluetooth/hci.h>
-#include <zephyr/bluetooth/conn.h>
-#include <zephyr/bluetooth/uuid.h>
-#include <zephyr/bluetooth/gatt.h>
-
-extern enum bst_result_t bst_result;
-
-#define WAIT_TIME (30 * 1e6) /*seconds*/
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define UNSET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)false)
-#define WAIT_FOR_FLAG(flag) \
-	while (!(bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-
-#define FAIL(...) \
-	do { \
-		bst_result = Failed; \
-		bs_trace_error_time_line(__VA_ARGS__); \
-	} while (0)
-
-#define PASS(...) \
-	do { \
-		bst_result = Passed; \
-		bs_trace_info_time(1, __VA_ARGS__); \
-	} while (0)
-
 #define CHRC_SIZE 10
 #define LONG_CHRC_SIZE 40
 
@@ -69,6 +28,3 @@ extern enum bst_result_t bst_result;
 #define TEST_LESC_CHRC_UUID \
 	BT_UUID_DECLARE_128(0x01, 0x23, 0x45, 0x67, 0x89, 0x01, 0x02, 0x03, \
 			    0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0xFF, 0x33)
-
-void test_tick(bs_time_t HW_device_time);
-void test_init(void);
diff --git a/tests/bsim/bluetooth/host/gatt/general/src/gatt_client_test.c b/tests/bsim/bluetooth/host/gatt/general/src/gatt_client_test.c
index a0fe2704f8e..b78b5d2a619 100644
--- a/tests/bsim/bluetooth/host/gatt/general/src/gatt_client_test.c
+++ b/tests/bsim/bluetooth/host/gatt/general/src/gatt_client_test.c
@@ -4,16 +4,27 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <zephyr/kernel.h>
+
+#include <zephyr/types.h>
+#include <stddef.h>
+#include <errno.h>
+
 #include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/uuid.h>
 #include <zephyr/bluetooth/gatt.h>
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 
-CREATE_FLAG(flag_is_connected);
-CREATE_FLAG(flag_discover_complete);
-CREATE_FLAG(flag_security_changed);
-CREATE_FLAG(flag_write_complete);
-CREATE_FLAG(flag_read_complete);
+static DEFINE_FLAG(flag_is_connected);
+static DEFINE_FLAG(flag_discover_complete);
+static DEFINE_FLAG(flag_security_changed);
+static DEFINE_FLAG(flag_write_complete);
+static DEFINE_FLAG(flag_read_complete);
 
 static struct bt_conn *g_conn;
 static uint16_t chrc_handle;
@@ -36,7 +47,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != 0) {
-		FAIL("Failed to connect to %s (%u)\n", addr, err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, err);
 		return;
 	}
 
@@ -68,7 +79,7 @@ static void disconnected(struct bt_conn *conn, uint8_t reason)
 static void security_changed(struct bt_conn *conn, bt_security_t level, enum bt_security_err err)
 {
 	if (err != BT_SECURITY_ERR_SUCCESS) {
-		FAIL("Security failed (err %d)\n", err);
+		TEST_FAIL("Security failed (err %d)", err);
 	} else {
 		SET_FLAG(flag_security_changed);
 	}
@@ -101,14 +112,14 @@ void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 	printk("Stopping scan\n");
 	err = bt_le_scan_stop();
 	if (err != 0) {
-		FAIL("Could not stop scan: %d\n");
+		TEST_FAIL("Could not stop scan: %d");
 		return;
 	}
 
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN,
 				BT_LE_CONN_PARAM_DEFAULT, &g_conn);
 	if (err != 0) {
-		FAIL("Could not connect to peer: %d\n", err);
+		TEST_FAIL("Could not connect to peer: %d", err);
 	}
 }
 
@@ -120,7 +131,7 @@ static uint8_t discover_func(struct bt_conn *conn,
 
 	if (attr == NULL) {
 		if (chrc_handle == 0 || long_chrc_handle == 0) {
-			FAIL("Did not discover chrc (%x) or long_chrc (%x)\n", chrc_handle,
+			TEST_FAIL("Did not discover chrc (%x) or long_chrc (%x)", chrc_handle,
 			     long_chrc_handle);
 		}
 
@@ -142,7 +153,7 @@ static uint8_t discover_func(struct bt_conn *conn,
 
 		err = bt_gatt_discover(conn, params);
 		if (err != 0) {
-			FAIL("Discover failed (err %d)\n", err);
+			TEST_FAIL("Discover failed (err %d)", err);
 		}
 
 		return BT_GATT_ITER_STOP;
@@ -182,7 +193,7 @@ static void gatt_discover(void)
 
 	err = bt_gatt_discover(g_conn, &discover_params);
 	if (err != 0) {
-		FAIL("Discover failed(err %d)\n", err);
+		TEST_FAIL("Discover failed(err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(flag_discover_complete);
@@ -196,7 +207,7 @@ static void update_security(void)
 	printk("Updating security\n");
 	err = bt_conn_set_security(g_conn, BT_SECURITY_L2);
 	if (err != 0) {
-		FAIL("Set security failed (err %d)\n", err);
+		TEST_FAIL("Set security failed (err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(flag_security_changed);
@@ -241,13 +252,13 @@ static void gatt_write(uint16_t handle, uint8_t expect_att_err)
 
 	err = bt_gatt_write(g_conn, &write_params);
 	if (err != 0) {
-		FAIL("bt_gatt_write failed: %d\n", err);
+		TEST_FAIL("bt_gatt_write failed: %d", err);
 	}
 
 	WAIT_FOR_FLAG(flag_write_complete);
 
 	if (att_err != expect_att_err) {
-		FAIL("Write failed: 0x%02X\n", att_err);
+		TEST_FAIL("Write failed: 0x%02X", att_err);
 	}
 
 	printk("success\n");
@@ -270,7 +281,8 @@ static uint8_t gatt_read_cb(struct bt_conn *conn, uint8_t err,
 
 	if (data != NULL) {
 		if (data_received_size + length > sizeof(data_received)) {
-			FAIL("Invalid amount of data received: %u\n", data_received_size + length);
+			TEST_FAIL("Invalid amount of data received: %u",
+				  data_received_size + length);
 		} else {
 			memcpy(&data_received[data_received_size], data, length);
 			data_received_size += length;
@@ -282,23 +294,25 @@ static uint8_t gatt_read_cb(struct bt_conn *conn, uint8_t err,
 	if (params->single.handle == chrc_handle) {
 		if (data_received_size != CHRC_SIZE ||
 		    memcmp(data_received, chrc_data, data_received_size) != 0) {
-			FAIL("chrc data different than expected (%u %u)\n", length, CHRC_SIZE);
+			TEST_FAIL("chrc data different than expected (%u %u)", length, CHRC_SIZE);
 		}
 	} else if (params->single.handle == long_chrc_handle) {
 		if (data_received_size != LONG_CHRC_SIZE ||
 		    memcmp(data_received, long_chrc_data, data_received_size) != 0) {
-			FAIL("long_chrc data different than expected (%u %u)\n", length,
-			     LONG_CHRC_SIZE);
+			TEST_FAIL("long_chrc data different than expected (%u %u)", length,
+				  LONG_CHRC_SIZE);
 		}
 	} else if (params->single.handle == enc_chrc_handle) {
 		if (data_received_size != CHRC_SIZE ||
 		    memcmp(data_received, chrc_data, data_received_size) != 0) {
-			FAIL("enc_chrc data different than expected (%u %u)\n", length, CHRC_SIZE);
+			TEST_FAIL("enc_chrc data different than expected (%u %u)", length,
+				  CHRC_SIZE);
 		}
 	} else if (params->single.handle == lesc_chrc_handle) {
 		if (data_received_size != CHRC_SIZE ||
 		    memcmp(data_received, chrc_data, data_received_size) != 0) {
-			FAIL("lesc_chrc data different than expected (%u %u)\n", length, CHRC_SIZE);
+			TEST_FAIL("lesc_chrc data different than expected (%u %u)", length,
+				  CHRC_SIZE);
 		}
 	}
 
@@ -335,13 +349,13 @@ static void gatt_read(uint16_t handle, uint8_t expect_att_err)
 
 	err = bt_gatt_read(g_conn, &read_params);
 	if (err != 0) {
-		FAIL("bt_gatt_read failed: %d\n", err);
+		TEST_FAIL("bt_gatt_read failed: %d", err);
 	}
 
 	WAIT_FOR_FLAG(flag_read_complete);
 
 	if (att_err != expect_att_err) {
-		FAIL("Read failed: 0x%02X\n", att_err);
+		TEST_FAIL("Read failed: 0x%02X", att_err);
 	}
 
 	printk("success\n");
@@ -355,12 +369,12 @@ static void test_main(void)
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth discover failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth discover failed (err %d)", err);
 	}
 
 	err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
 	if (err != 0) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 	}
 
 	printk("Scanning successfully started\n");
@@ -389,14 +403,12 @@ static void test_main(void)
 	gatt_write(lesc_chrc_handle, BT_ATT_ERR_SUCCESS);
 	gatt_read(lesc_chrc_handle, BT_ATT_ERR_SUCCESS);
 
-	PASS("GATT client Passed\n");
+	TEST_PASS("GATT client Passed");
 }
 
 static const struct bst_test_instance test_vcs[] = {
 	{
 		.test_id = "gatt_client",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/gatt/general/src/gatt_server_test.c b/tests/bsim/bluetooth/host/gatt/general/src/gatt_server_test.c
index 476f5bba0ef..6f3225c4d29 100644
--- a/tests/bsim/bluetooth/host/gatt/general/src/gatt_server_test.c
+++ b/tests/bsim/bluetooth/host/gatt/general/src/gatt_server_test.c
@@ -4,11 +4,25 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <zephyr/kernel.h>
+
+#include <zephyr/types.h>
+#include <stddef.h>
+#include <errno.h>
+
+#include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/uuid.h>
+#include <zephyr/bluetooth/gatt.h>
+
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 
 extern enum bst_result_t bst_result;
 
-CREATE_FLAG(flag_is_connected);
+static DEFINE_FLAG(flag_is_connected);
 
 static struct bt_conn *g_conn;
 
@@ -19,7 +33,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != 0) {
-		FAIL("Failed to connect to %s (%u)\n", addr, err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, err);
 		return;
 	}
 
@@ -79,7 +93,7 @@ static ssize_t write_test_chrc(struct bt_conn *conn,
 	}
 
 	if (flags != 0) {
-		FAIL("Invalid flags %u\n", flags);
+		TEST_FAIL("Invalid flags %u", flags);
 		return BT_GATT_ERR(BT_ATT_ERR_UNLIKELY);
 	}
 
@@ -155,7 +169,7 @@ static void test_main(void)
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 		return;
 	}
 
@@ -163,7 +177,7 @@ static void test_main(void)
 
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, ad, ARRAY_SIZE(ad), NULL, 0);
 	if (err != 0) {
-		FAIL("Advertising failed to start (err %d)\n", err);
+		TEST_FAIL("Advertising failed to start (err %d)", err);
 		return;
 	}
 
@@ -171,14 +185,12 @@ static void test_main(void)
 
 	WAIT_FOR_FLAG(flag_is_connected);
 
-	PASS("GATT server passed\n");
+	TEST_PASS("GATT server passed");
 }
 
 static const struct bst_test_instance test_gatt_server[] = {
 	{
 		.test_id = "gatt_server",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/gatt/general/test_scripts/gatt.sh b/tests/bsim/bluetooth/host/gatt/general/test_scripts/gatt.sh
index df41707e832..dbcf0078403 100755
--- a/tests/bsim/bluetooth/host/gatt/general/test_scripts/gatt.sh
+++ b/tests/bsim/bluetooth/host/gatt/general/test_scripts/gatt.sh
@@ -21,6 +21,6 @@ Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_host_gatt_general_prj_conf \
   -v=${verbosity_level} -s=${simulation_id} -d=1 -testid=gatt_server -RealEncryption=1
 
 Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
-  -D=2 -sim_length=60e6 $@
+  -D=2 -sim_length=30e6 $@
 
 wait_for_background_jobs
diff --git a/tests/bsim/bluetooth/host/gatt/notify/CMakeLists.txt b/tests/bsim/bluetooth/host/gatt/notify/CMakeLists.txt
index 7869a21840f..b279e8c1439 100644
--- a/tests/bsim/bluetooth/host/gatt/notify/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/gatt/notify/CMakeLists.txt
@@ -5,6 +5,9 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_gatt)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 FILE(GLOB app_sources src/*.c)
 target_sources(app PRIVATE ${app_sources} )
 
diff --git a/tests/bsim/bluetooth/host/gatt/notify/src/common.c b/tests/bsim/bluetooth/host/gatt/notify/src/common.c
deleted file mode 100644
index df438607c5f..00000000000
--- a/tests/bsim/bluetooth/host/gatt/notify/src/common.c
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "common.h"
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i seconds)\n", WAIT_TIME);
-	}
-}
-
-void test_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-	bst_result = In_progress;
-}
diff --git a/tests/bsim/bluetooth/host/gatt/notify/src/common.h b/tests/bsim/bluetooth/host/gatt/notify/src/common.h
index 67486b175e4..1058eb86d37 100644
--- a/tests/bsim/bluetooth/host/gatt/notify/src/common.h
+++ b/tests/bsim/bluetooth/host/gatt/notify/src/common.h
@@ -6,46 +6,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <zephyr/kernel.h>
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "time_machine.h"
-#include "bstests.h"
-
-#include <zephyr/types.h>
-#include <stddef.h>
-#include <errno.h>
-
-#include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/bluetooth/hci.h>
-#include <zephyr/bluetooth/conn.h>
-#include <zephyr/bluetooth/uuid.h>
-#include <zephyr/bluetooth/gatt.h>
-
-extern enum bst_result_t bst_result;
-
-#define WAIT_TIME (60 * 1e6) /*seconds*/
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define UNSET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)false)
-#define WAIT_FOR_FLAG(flag)                                                                        \
-	while (!(bool)atomic_get(&flag)) {                                                         \
-		(void)k_sleep(K_MSEC(1));                                                          \
-	}
-
-#define FAIL(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Failed;                                                               \
-		bs_trace_error_time_line(__VA_ARGS__);                                             \
-	} while (0)
-
-#define PASS(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Passed;                                                               \
-		bs_trace_info_time(1, __VA_ARGS__);                                                \
-	} while (0)
+#include <zephyr/toolchain.h>
 
 #define CHRC_SIZE 10
 #define LONG_CHRC_SIZE 40
@@ -62,8 +23,5 @@ extern enum bst_result_t bst_result;
 	BT_UUID_DECLARE_128(0x01, 0x23, 0x45, 0x67, 0x89, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,      \
 			    0x07, 0x08, 0x09, 0xFF, 0x11)
 
-void test_tick(bs_time_t HW_device_time);
-void test_init(void);
-
 #define NOTIFICATION_COUNT 10
 BUILD_ASSERT(NOTIFICATION_COUNT % 2 == 0);
diff --git a/tests/bsim/bluetooth/host/gatt/notify/src/gatt_client_test.c b/tests/bsim/bluetooth/host/gatt/notify/src/gatt_client_test.c
index 125029653a0..273ddf51aa7 100644
--- a/tests/bsim/bluetooth/host/gatt/notify/src/gatt_client_test.c
+++ b/tests/bsim/bluetooth/host/gatt/notify/src/gatt_client_test.c
@@ -4,16 +4,26 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <stddef.h>
+#include <errno.h>
+
+#include <zephyr/kernel.h>
+#include <zephyr/types.h>
 #include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/uuid.h>
 #include <zephyr/bluetooth/gatt.h>
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 
-CREATE_FLAG(flag_is_connected);
-CREATE_FLAG(flag_is_encrypted);
-CREATE_FLAG(flag_discover_complete);
-CREATE_FLAG(flag_short_subscribed);
-CREATE_FLAG(flag_long_subscribed);
+static DEFINE_FLAG(flag_is_connected);
+static DEFINE_FLAG(flag_is_encrypted);
+static DEFINE_FLAG(flag_discover_complete);
+static DEFINE_FLAG(flag_short_subscribed);
+static DEFINE_FLAG(flag_long_subscribed);
 
 static struct bt_conn *g_conn;
 static uint16_t chrc_handle;
@@ -27,7 +37,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != 0) {
-		FAIL("Failed to connect to %s (%u)\n", addr, err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, err);
 		return;
 	}
 
@@ -57,9 +67,9 @@ static void disconnected(struct bt_conn *conn, uint8_t reason)
 void security_changed(struct bt_conn *conn, bt_security_t level, enum bt_security_err err)
 {
 	if (err) {
-		FAIL("Encryption failer (%d)\n", err);
+		TEST_FAIL("Encryption failure (%d)", err);
 	} else if (level < BT_SECURITY_L2) {
-		FAIL("Insufficient sec level (%d)\n", level);
+		TEST_FAIL("Insufficient sec level (%d)", level);
 	} else {
 		SET_FLAG(flag_is_encrypted);
 	}
@@ -91,13 +101,13 @@ void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type, struct ne
 	printk("Stopping scan\n");
 	err = bt_le_scan_stop();
 	if (err != 0) {
-		FAIL("Could not stop scan: %d");
+		TEST_FAIL("Could not stop scan: %d");
 		return;
 	}
 
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, BT_LE_CONN_PARAM_DEFAULT, &g_conn);
 	if (err != 0) {
-		FAIL("Could not connect to peer: %d", err);
+		TEST_FAIL("Could not connect to peer: %d", err);
 	}
 }
 
@@ -108,7 +118,7 @@ static uint8_t discover_func(struct bt_conn *conn, const struct bt_gatt_attr *at
 
 	if (attr == NULL) {
 		if (chrc_handle == 0 || long_chrc_handle == 0) {
-			FAIL("Did not discover chrc (%x) or long_chrc (%x)", chrc_handle,
+			TEST_FAIL("Did not discover chrc (%x) or long_chrc (%x)", chrc_handle,
 			     long_chrc_handle);
 		}
 
@@ -130,7 +140,7 @@ static uint8_t discover_func(struct bt_conn *conn, const struct bt_gatt_attr *at
 
 		err = bt_gatt_discover(conn, params);
 		if (err != 0) {
-			FAIL("Discover failed (err %d)\n", err);
+			TEST_FAIL("Discover failed (err %d)", err);
 		}
 
 		return BT_GATT_ITER_STOP;
@@ -165,7 +175,7 @@ static void gatt_discover(enum bt_att_chan_opt opt)
 
 	err = bt_gatt_discover(g_conn, &discover_params);
 	if (err != 0) {
-		FAIL("Discover failed(err %d)\n", err);
+		TEST_FAIL("Discover failed(err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(flag_discover_complete);
@@ -176,7 +186,7 @@ static void test_short_subscribed(struct bt_conn *conn, uint8_t err,
 				  struct bt_gatt_subscribe_params *params)
 {
 	if (err) {
-		FAIL("Subscribe failed (err %d)\n", err);
+		TEST_FAIL("Subscribe failed (err %d)", err);
 	}
 
 	SET_FLAG(flag_short_subscribed);
@@ -189,7 +199,7 @@ static void test_short_subscribed(struct bt_conn *conn, uint8_t err,
 	if (params->value_handle == chrc_handle) {
 		printk("Subscribed to short characteristic\n");
 	} else {
-		FAIL("Unknown handle %d\n", params->value_handle);
+		TEST_FAIL("Unknown handle %d", params->value_handle);
 	}
 }
 
@@ -197,7 +207,7 @@ static void test_long_subscribed(struct bt_conn *conn, uint8_t err,
 				 struct bt_gatt_subscribe_params *params)
 {
 	if (err) {
-		FAIL("Subscribe failed (err %d)\n", err);
+		TEST_FAIL("Subscribe failed (err %d)", err);
 	}
 
 	SET_FLAG(flag_long_subscribed);
@@ -210,7 +220,7 @@ static void test_long_subscribed(struct bt_conn *conn, uint8_t err,
 	if (params->value_handle == long_chrc_handle) {
 		printk("Subscribed to long characteristic\n");
 	} else {
-		FAIL("Unknown handle %d\n", params->value_handle);
+		TEST_FAIL("Unknown handle %d", params->value_handle);
 	}
 }
 
@@ -250,7 +260,7 @@ static void gatt_subscribe_short(enum bt_att_chan_opt opt)
 	sub_params_short.chan_opt = opt;
 	err = bt_gatt_subscribe(g_conn, &sub_params_short);
 	if (err < 0) {
-		FAIL("Failed to subscribe\n");
+		TEST_FAIL("Failed to subscribe");
 	} else {
 		printk("Subscribe request sent\n");
 	}
@@ -264,7 +274,7 @@ static void gatt_unsubscribe_short(enum bt_att_chan_opt opt)
 	sub_params_short.chan_opt = opt;
 	err = bt_gatt_unsubscribe(g_conn, &sub_params_short);
 	if (err < 0) {
-		FAIL("Failed to unsubscribe\n");
+		TEST_FAIL("Failed to unsubscribe");
 	} else {
 		printk("Unsubscribe request sent\n");
 	}
@@ -279,7 +289,7 @@ static void gatt_subscribe_long(enum bt_att_chan_opt opt)
 	sub_params_long.chan_opt = opt;
 	err = bt_gatt_subscribe(g_conn, &sub_params_long);
 	if (err < 0) {
-		FAIL("Failed to subscribe\n");
+		TEST_FAIL("Failed to subscribe");
 	} else {
 		printk("Subscribe request sent\n");
 	}
@@ -294,7 +304,7 @@ static void gatt_unsubscribe_long(enum bt_att_chan_opt opt)
 	sub_params_long.chan_opt = opt;
 	err = bt_gatt_unsubscribe(g_conn, &sub_params_long);
 	if (err < 0) {
-		FAIL("Failed to unsubscribe\n");
+		TEST_FAIL("Failed to unsubscribe");
 	} else {
 		printk("Unsubscribe request sent\n");
 	}
@@ -306,12 +316,12 @@ static void setup(void)
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth discover failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth discover failed (err %d)", err);
 	}
 
 	err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
 	if (err != 0) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 	}
 
 	printk("Scanning successfully started\n");
@@ -320,7 +330,7 @@ static void setup(void)
 
 	err = bt_conn_set_security(g_conn, BT_SECURITY_L2);
 	if (err) {
-		FAIL("Starting encryption procedure failed (%d)\n", err);
+		TEST_FAIL("Starting encryption procedure failed (%d)", err);
 	}
 
 	WAIT_FOR_FLAG(flag_is_encrypted);
@@ -354,7 +364,7 @@ static void test_main_none(void)
 
 	printk("Unsubscribed\n");
 
-	PASS("GATT client Passed\n");
+	TEST_PASS("GATT client Passed");
 }
 
 static void test_main_unenhanced(void)
@@ -380,7 +390,7 @@ static void test_main_unenhanced(void)
 
 	printk("Unsubscribed\n");
 
-	PASS("GATT client Passed\n");
+	TEST_PASS("GATT client Passed");
 }
 
 static void test_main_enhanced(void)
@@ -406,7 +416,7 @@ static void test_main_enhanced(void)
 
 	printk("Unsubscribed\n");
 
-	PASS("GATT client Passed\n");
+	TEST_PASS("GATT client Passed");
 }
 
 static void test_main_mixed(void)
@@ -432,32 +442,24 @@ static void test_main_mixed(void)
 
 	printk("Unsubscribed\n");
 
-	PASS("GATT client Passed\n");
+	TEST_PASS("GATT client Passed");
 }
 
 static const struct bst_test_instance test_vcs[] = {
 	{
 		.test_id = "gatt_client_none",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_none,
 	},
 	{
 		.test_id = "gatt_client_unenhanced",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_unenhanced,
 	},
 	{
 		.test_id = "gatt_client_enhanced",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_enhanced,
 	},
 	{
 		.test_id = "gatt_client_mixed",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_mixed,
 	},
 	BSTEST_END_MARKER,
diff --git a/tests/bsim/bluetooth/host/gatt/notify/src/gatt_server_test.c b/tests/bsim/bluetooth/host/gatt/notify/src/gatt_server_test.c
index 6b4cc13a7c2..d293ad9ac19 100644
--- a/tests/bsim/bluetooth/host/gatt/notify/src/gatt_server_test.c
+++ b/tests/bsim/bluetooth/host/gatt/notify/src/gatt_server_test.c
@@ -3,14 +3,26 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
+#include <stddef.h>
+#include <errno.h>
 
+#include <zephyr/kernel.h>
+#include <zephyr/types.h>
+#include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/uuid.h>
+#include <zephyr/bluetooth/gatt.h>
+
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 
 extern enum bst_result_t bst_result;
 
-CREATE_FLAG(flag_is_connected);
-CREATE_FLAG(flag_short_subscribe);
-CREATE_FLAG(flag_long_subscribe);
+static DEFINE_FLAG(flag_is_connected);
+static DEFINE_FLAG(flag_short_subscribe);
+static DEFINE_FLAG(flag_long_subscribe);
 
 static struct bt_conn *g_conn;
 
@@ -25,7 +37,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != 0) {
-		FAIL("Failed to connect to %s (%u)\n", addr, err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, err);
 		return;
 	}
 
@@ -137,7 +149,7 @@ static void short_notify(enum bt_att_chan_opt opt)
 		if (err == -ENOMEM) {
 			k_sleep(K_MSEC(10));
 		} else if (err) {
-			FAIL("Short notify failed (err %d)\n", err);
+			TEST_FAIL("Short notify failed (err %d)", err);
 		}
 	} while (err);
 }
@@ -163,7 +175,7 @@ static void long_notify(enum bt_att_chan_opt opt)
 		if (err == -ENOMEM) {
 			k_sleep(K_MSEC(10));
 		} else if (err) {
-			FAIL("Long notify failed (err %d)\n", err);
+			TEST_FAIL("Long notify failed (err %d)", err);
 		}
 	} while (err);
 }
@@ -177,7 +189,7 @@ static void setup(void)
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 		return;
 	}
 
@@ -185,7 +197,7 @@ static void setup(void)
 
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, ad, ARRAY_SIZE(ad), NULL, 0);
 	if (err != 0) {
-		FAIL("Advertising failed to start (err %d)\n", err);
+		TEST_FAIL("Advertising failed to start (err %d)", err);
 		return;
 	}
 
@@ -215,7 +227,7 @@ static void test_main_none(void)
 		k_sleep(K_MSEC(100));
 	}
 
-	PASS("GATT server passed\n");
+	TEST_PASS("GATT server passed");
 }
 
 static void test_main_enhanced(void)
@@ -231,7 +243,7 @@ static void test_main_enhanced(void)
 		k_sleep(K_MSEC(100));
 	}
 
-	PASS("GATT server passed\n");
+	TEST_PASS("GATT server passed");
 }
 
 static void test_main_unenhanced(void)
@@ -247,7 +259,7 @@ static void test_main_unenhanced(void)
 		k_sleep(K_MSEC(100));
 	}
 
-	PASS("GATT server passed\n");
+	TEST_PASS("GATT server passed");
 }
 
 static void test_main_mixed(void)
@@ -263,32 +275,24 @@ static void test_main_mixed(void)
 		k_sleep(K_MSEC(100));
 	}
 
-	PASS("GATT server passed\n");
+	TEST_PASS("GATT server passed");
 }
 
 static const struct bst_test_instance test_gatt_server[] = {
 	{
 		.test_id = "gatt_server_none",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_none,
 	},
 	{
 		.test_id = "gatt_server_unenhanced",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_unenhanced,
 	},
 	{
 		.test_id = "gatt_server_enhanced",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_enhanced,
 	},
 	{
 		.test_id = "gatt_server_mixed",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_mixed,
 	},
 	BSTEST_END_MARKER,
diff --git a/tests/bsim/bluetooth/host/gatt/settings/src/main.c b/tests/bsim/bluetooth/host/gatt/settings/src/main.c
index 6fd131ca3ed..12fbed9e8f8 100644
--- a/tests/bsim/bluetooth/host/gatt/settings/src/main.c
+++ b/tests/bsim/bluetooth/host/gatt/settings/src/main.c
@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <stdlib.h>
 #include "utils.h"
 #include "main.h"
 #include "argparse.h"
@@ -41,8 +42,8 @@ static void test_args(int argc, char **argv)
 {
 	__ASSERT(argc == 3, "Please specify only 3 test arguments\n");
 
-	test_round = atol(argv[0]);
-	final_round = atol(argv[1]);
+	test_round = strtol(argv[0], NULL, 10);
+	final_round = strtol(argv[1], NULL, 10);
 	settings_file = argv[2];
 
 	bs_trace_raw(0, "Test round %u\n", test_round);
diff --git a/tests/bsim/bluetooth/host/iso/bis/CMakeLists.txt b/tests/bsim/bluetooth/host/iso/bis/CMakeLists.txt
index 89a3d5cf313..c9ecd0997a3 100644
--- a/tests/bsim/bluetooth/host/iso/bis/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/iso/bis/CMakeLists.txt
@@ -10,7 +10,6 @@ add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
 target_link_libraries(app PRIVATE babblekit)
 
 target_sources(app PRIVATE
-  src/common.c
   src/bis_broadcaster.c
   src/bis_receiver.c
   src/main.c
diff --git a/tests/bsim/bluetooth/host/iso/bis/src/bis_broadcaster.c b/tests/bsim/bluetooth/host/iso/bis/src/bis_broadcaster.c
index 4afc0bb3247..cef7d417ff3 100644
--- a/tests/bsim/bluetooth/host/iso/bis/src/bis_broadcaster.c
+++ b/tests/bsim/bluetooth/host/iso/bis/src/bis_broadcaster.c
@@ -3,9 +3,6 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
-
-#include "common.h"
-
 #include <zephyr/bluetooth/bluetooth.h>
 #include <zephyr/bluetooth/iso.h>
 #include <zephyr/logging/log.h>
@@ -308,15 +305,11 @@ static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "broadcaster",
 		.test_descr = "Minimal BIS broadcaster that broadcast ISO data",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main,
 	},
 	{
 		.test_id = "broadcaster_disable",
 		.test_descr = "BIS broadcaster that tests bt_disable for ISO",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_disable,
 	},
 	BSTEST_END_MARKER,
diff --git a/tests/bsim/bluetooth/host/iso/bis/src/bis_receiver.c b/tests/bsim/bluetooth/host/iso/bis/src/bis_receiver.c
index ac72cd26694..d4a03284c17 100644
--- a/tests/bsim/bluetooth/host/iso/bis/src/bis_receiver.c
+++ b/tests/bsim/bluetooth/host/iso/bis/src/bis_receiver.c
@@ -5,7 +5,6 @@
  */
 
 #include <stdint.h>
-#include "common.h"
 
 #include <zephyr/bluetooth/bluetooth.h>
 #include <zephyr/bluetooth/gap.h>
@@ -270,8 +269,6 @@ static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "receiver",
 		.test_descr = "receiver",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main,
 	},
 	BSTEST_END_MARKER,
diff --git a/tests/bsim/bluetooth/host/iso/bis/src/common.c b/tests/bsim/bluetooth/host/iso/bis/src/common.c
deleted file mode 100644
index f644f9181c2..00000000000
--- a/tests/bsim/bluetooth/host/iso/bis/src/common.c
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
- * Copyright (c) 2024 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-#include <string.h>
-
-#include <zephyr/bluetooth/conn.h>
-#include <zephyr/bluetooth/addr.h>
-#include <zephyr/sys/printk.h>
-#include <zephyr/sys/util.h>
-
-#include "babblekit/flags.h"
-#include "babblekit/testcase.h"
-
-#include "common.h"
-
-extern enum bst_result_t bst_result;
-
-void test_init(void)
-{
-	bst_result = In_progress;
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-}
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		TEST_FAIL("Test failed (not passed after %" PRIu64 " us)", WAIT_TIME);
-	}
-}
diff --git a/tests/bsim/bluetooth/host/iso/bis/src/common.h b/tests/bsim/bluetooth/host/iso/bis/src/common.h
deleted file mode 100644
index 60a191e3883..00000000000
--- a/tests/bsim/bluetooth/host/iso/bis/src/common.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * Common functions and helpers for ISO broadcast tests
- *
- * Copyright (c) 2024 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "bstests.h"
-
-#define WAIT_TIME (30e6) /* 30 seconds*/
-
-void test_init(void);
-void test_tick(bs_time_t HW_device_time);
diff --git a/tests/bsim/bluetooth/host/iso/cis/CMakeLists.txt b/tests/bsim/bluetooth/host/iso/cis/CMakeLists.txt
index 2e8e50c8f7f..a0328bc6870 100644
--- a/tests/bsim/bluetooth/host/iso/cis/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/iso/cis/CMakeLists.txt
@@ -18,6 +18,9 @@ zephyr_include_directories(
   )
 
 add_subdirectory(${ZEPHYR_BASE}/tests/bluetooth/common/testlib testlib)
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+
 target_link_libraries(app PRIVATE
   testlib
+  babblekit
 )
diff --git a/tests/bsim/bluetooth/host/iso/cis/src/cis_central.c b/tests/bsim/bluetooth/host/iso/cis/src/cis_central.c
index 80fff68d4ef..75c92a9e181 100644
--- a/tests/bsim/bluetooth/host/iso/cis/src/cis_central.c
+++ b/tests/bsim/bluetooth/host/iso/cis/src/cis_central.c
@@ -4,6 +4,8 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 
 #include <zephyr/bluetooth/bluetooth.h>
@@ -25,7 +27,7 @@ NET_BUF_POOL_FIXED_DEFINE(tx_pool, ENQUEUE_COUNT, BT_ISO_SDU_BUF_SIZE(CONFIG_BT_
 
 BUILD_ASSERT(CONFIG_BT_ISO_MAX_CHAN > 1, "CONFIG_BT_ISO_MAX_CHAN shall be at least 2");
 
-CREATE_FLAG(flag_iso_connected);
+static DEFINE_FLAG(flag_iso_connected);
 
 static void send_data_cb(struct k_work *work)
 {
@@ -35,7 +37,7 @@ static void send_data_cb(struct k_work *work)
 	struct net_buf *buf;
 	int ret;
 
-	if (!TEST_FLAG(flag_iso_connected)) {
+	if (!IS_FLAG_SET(flag_iso_connected)) {
 		/* TX has been aborted */
 		return;
 	}
@@ -86,7 +88,7 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 
 	err = bt_le_scan_stop();
 	if (err) {
-		FAIL("Failed to stop scanning (err %d)\n", err);
+		TEST_FAIL("Failed to stop scanning (err %d)", err);
 
 		return;
 	}
@@ -94,7 +96,7 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, BT_LE_CONN_PARAM_DEFAULT,
 				&default_conn);
 	if (err) {
-		FAIL("Failed to create connection (err %d)\n", err);
+		TEST_FAIL("Failed to create connection (err %d)", err);
 
 		return;
 	}
@@ -132,14 +134,14 @@ static void sdu_sent_cb(struct bt_iso_chan *chan)
 
 	enqueue_cnt++;
 
-	if (!TEST_FLAG(flag_iso_connected)) {
+	if (!IS_FLAG_SET(flag_iso_connected)) {
 		/* TX has been aborted */
 		return;
 	}
 
 	err = k_work_schedule(&iso_send_work, K_NO_WAIT);
 	if (err < 0) {
-		FAIL("Failed to schedule TX for chan %p: %d\n", chan, err);
+		TEST_FAIL("Failed to schedule TX for chan %p: %d", chan, err);
 	}
 }
 
@@ -164,7 +166,7 @@ static void init(void)
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth enable failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth enable failed (err %d)", err);
 
 		return;
 	}
@@ -208,7 +210,7 @@ static void create_cig(size_t iso_channels)
 
 	err = bt_iso_cig_create(&param, &cig);
 	if (err != 0) {
-		FAIL("Failed to create CIG (%d)\n", err);
+		TEST_FAIL("Failed to create CIG (%d)", err);
 
 		return;
 	}
@@ -224,14 +226,14 @@ static int reconfigure_cig_interval(struct bt_iso_cig_param *param)
 	param->p_to_c_interval = param->c_to_p_interval;
 	err = bt_iso_cig_reconfigure(cig, param);
 	if (err != 0) {
-		FAIL("Failed to reconfigure CIG to new interval (%d)\n", err);
+		TEST_FAIL("Failed to reconfigure CIG to new interval (%d)", err);
 
 		return err;
 	}
 
 	err = bt_iso_cig_reconfigure(cig, param);
 	if (err != 0) {
-		FAIL("Failed to reconfigure CIG to same interval (%d)\n", err);
+		TEST_FAIL("Failed to reconfigure CIG to same interval (%d)", err);
 
 		return err;
 	}
@@ -241,7 +243,7 @@ static int reconfigure_cig_interval(struct bt_iso_cig_param *param)
 	param->p_to_c_interval = 2500; /* us */
 	err = bt_iso_cig_reconfigure(cig, param);
 	if (err != 0) {
-		FAIL("Failed to reconfigure CIG to new interval (%d)\n", err);
+		TEST_FAIL("Failed to reconfigure CIG to new interval (%d)", err);
 
 		return err;
 	}
@@ -259,7 +261,7 @@ static int reconfigure_cig_latency(struct bt_iso_cig_param *param)
 	param->p_to_c_latency = param->c_to_p_latency;
 	err = bt_iso_cig_reconfigure(cig, param);
 	if (err != 0) {
-		FAIL("Failed to reconfigure CIG latency (%d)\n", err);
+		TEST_FAIL("Failed to reconfigure CIG latency (%d)", err);
 
 		return err;
 	}
@@ -268,7 +270,7 @@ static int reconfigure_cig_latency(struct bt_iso_cig_param *param)
 	param->p_to_c_latency = 40; /* ms */
 	err = bt_iso_cig_reconfigure(cig, param);
 	if (err != 0) {
-		FAIL("Failed to reconfigure CIG for different latencies (%d)\n", err);
+		TEST_FAIL("Failed to reconfigure CIG for different latencies (%d)", err);
 
 		return err;
 	}
@@ -293,7 +295,7 @@ static void reconfigure_cig(void)
 
 	err = bt_iso_cig_reconfigure(cig, &param);
 	if (err != 0) {
-		FAIL("Failed to reconfigure CIS to new RTN (%d)\n", err);
+		TEST_FAIL("Failed to reconfigure CIS to new RTN (%d)", err);
 
 		return;
 	}
@@ -316,7 +318,8 @@ static void reconfigure_cig(void)
 
 	err = bt_iso_cig_reconfigure(cig, &param);
 	if (err != 0) {
-		FAIL("Failed to reconfigure CIG with new CIS and original parameters (%d)\n", err);
+		TEST_FAIL("Failed to reconfigure CIG with new CIS and original parameters (%d)",
+			  err);
 
 		return;
 	}
@@ -328,12 +331,12 @@ static void connect_acl(void)
 
 	err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
 	if (err != 0) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 
 		return;
 	}
 
-	WAIT_FOR_FLAG_SET(flag_connected);
+	WAIT_FOR_FLAG(flag_connected);
 }
 
 static void connect_cis(void)
@@ -346,12 +349,12 @@ static void connect_cis(void)
 
 	err = bt_iso_chan_connect(&connect_param, 1);
 	if (err) {
-		FAIL("Failed to connect ISO (%d)\n", err);
+		TEST_FAIL("Failed to connect ISO (%d)", err);
 
 		return;
 	}
 
-	WAIT_FOR_FLAG_SET(flag_iso_connected);
+	WAIT_FOR_FLAG(flag_iso_connected);
 }
 
 static void disconnect_cis(void)
@@ -360,7 +363,7 @@ static void disconnect_cis(void)
 
 	err = bt_iso_chan_disconnect(default_chan);
 	if (err) {
-		FAIL("Failed to disconnect ISO (err %d)\n", err);
+		TEST_FAIL("Failed to disconnect ISO (err %d)", err);
 
 		return;
 	}
@@ -374,7 +377,7 @@ static void disconnect_acl(void)
 
 	err = bt_conn_disconnect(default_conn, BT_HCI_ERR_REMOTE_USER_TERM_CONN);
 	if (err) {
-		FAIL("Failed to disconnect ACL (err %d)\n", err);
+		TEST_FAIL("Failed to disconnect ACL (err %d)", err);
 
 		return;
 	}
@@ -388,7 +391,7 @@ static void terminate_cig(void)
 
 	err = bt_iso_cig_terminate(cig);
 	if (err != 0) {
-		FAIL("Failed to terminate CIG (%d)\n", err);
+		TEST_FAIL("Failed to terminate CIG (%d)", err);
 
 		return;
 	}
@@ -404,7 +407,7 @@ static void reset_bluetooth(void)
 
 	err = bt_disable();
 	if (err != 0) {
-		FAIL("Failed to disable (%d)\n", err);
+		TEST_FAIL("Failed to disable (%d)", err);
 
 		return;
 	}
@@ -414,7 +417,7 @@ static void reset_bluetooth(void)
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Failed to re-enable (%d)\n", err);
+		TEST_FAIL("Failed to re-enable (%d)", err);
 
 		return;
 	}
@@ -436,7 +439,7 @@ static void test_main(void)
 	disconnect_acl();
 	terminate_cig();
 
-	PASS("Test passed\n");
+	TEST_PASS("Test passed");
 }
 
 static void test_main_disable(void)
@@ -464,22 +467,18 @@ static void test_main_disable(void)
 	disconnect_acl();
 	terminate_cig();
 
-	PASS("Disable test passed\n");
+	TEST_PASS("Disable test passed");
 }
 
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "central",
 		.test_descr = "Central",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main,
 	},
 	{
 		.test_id = "central_disable",
 		.test_descr = "CIS central that tests bt_disable for ISO",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main_disable,
 	},
 	BSTEST_END_MARKER,
diff --git a/tests/bsim/bluetooth/host/iso/cis/src/cis_peripheral.c b/tests/bsim/bluetooth/host/iso/cis/src/cis_peripheral.c
index 56fe4070ad5..abd7bba1c5a 100644
--- a/tests/bsim/bluetooth/host/iso/cis/src/cis_peripheral.c
+++ b/tests/bsim/bluetooth/host/iso/cis/src/cis_peripheral.c
@@ -6,6 +6,8 @@
 
 #include <stdbool.h>
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 
 #include <zephyr/bluetooth/bluetooth.h>
@@ -16,7 +18,7 @@
 
 extern enum bst_result_t bst_result;
 
-CREATE_FLAG(flag_data_received);
+static DEFINE_FLAG(flag_data_received);
 
 static const struct bt_data ad[] = {
 	BT_DATA_BYTES(BT_DATA_FLAGS, (BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR)),
@@ -85,7 +87,7 @@ static int iso_accept(const struct bt_iso_accept_info *info, struct bt_iso_chan
 	printk("Incoming request from %p\n", (void *)info->acl);
 
 	if (iso_chan.iso) {
-		FAIL("No channels available\n");
+		TEST_FAIL("No channels available");
 
 		return -ENOMEM;
 	}
@@ -120,7 +122,7 @@ static void init(void)
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Bluetooth enable failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth enable failed (err %d)", err);
 
 		return;
 	}
@@ -133,7 +135,7 @@ static void init(void)
 
 	err = bt_iso_server_register(&iso_server);
 	if (err) {
-		FAIL("Unable to register ISO server (err %d)\n", err);
+		TEST_FAIL("Unable to register ISO server (err %d)", err);
 
 		return;
 	}
@@ -145,14 +147,14 @@ static void adv_connect(void)
 
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, ad, ARRAY_SIZE(ad), NULL, 0);
 	if (err) {
-		FAIL("Advertising failed to start (err %d)\n", err);
+		TEST_FAIL("Advertising failed to start (err %d)", err);
 
 		return;
 	}
 
 	printk("Advertising successfully started\n");
 
-	WAIT_FOR_FLAG_SET(flag_connected);
+	WAIT_FOR_FLAG(flag_connected);
 }
 
 static void test_main(void)
@@ -163,8 +165,8 @@ static void test_main(void)
 		adv_connect();
 		bt_testlib_conn_wait_free();
 
-		if (TEST_FLAG(flag_data_received)) {
-			PASS("Test passed\n");
+		if (IS_FLAG_SET(flag_data_received)) {
+			TEST_PASS("Test passed");
 		}
 	}
 }
@@ -173,8 +175,6 @@ static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "peripheral",
 		.test_descr = "Peripheral",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main,
 	},
 	BSTEST_END_MARKER,
diff --git a/tests/bsim/bluetooth/host/iso/cis/src/common.c b/tests/bsim/bluetooth/host/iso/cis/src/common.c
index ef1a4e9f9dd..0bd848897b2 100644
--- a/tests/bsim/bluetooth/host/iso/cis/src/common.c
+++ b/tests/bsim/bluetooth/host/iso/cis/src/common.c
@@ -10,6 +10,8 @@
 #include <zephyr/sys/printk.h>
 #include <zephyr/sys/util.h>
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 
 extern enum bst_result_t bst_result;
@@ -31,7 +33,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 		bt_conn_unref(default_conn);
 		default_conn = NULL;
 
-		FAIL("Failed to connect to %s (0x%02x)\n", addr, err);
+		TEST_FAIL("Failed to connect to %s (0x%02x)", addr, err);
 
 		return;
 	}
@@ -72,16 +74,3 @@ BT_CONN_CB_DEFINE(conn_callbacks) = {
 	.disconnected = disconnected,
 	.le_param_updated = conn_param_updated_cb,
 };
-
-void test_init(void)
-{
-	bst_result = In_progress;
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-}
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("Test failed (not passed after %i us)\n", WAIT_TIME);
-	}
-}
diff --git a/tests/bsim/bluetooth/host/iso/cis/src/common.h b/tests/bsim/bluetooth/host/iso/cis/src/common.h
index 0b41515d223..53f8d4ed1fb 100644
--- a/tests/bsim/bluetooth/host/iso/cis/src/common.h
+++ b/tests/bsim/bluetooth/host/iso/cis/src/common.h
@@ -10,40 +10,6 @@
 
 #include <zephyr/sys/atomic.h>
 
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "bstests.h"
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t) false
-#define SET_FLAG(flag)    (void)atomic_set(&flag, (atomic_t) true)
-#define UNSET_FLAG(flag)  (void)atomic_set(&flag, (atomic_t) false)
-#define TEST_FLAG(flag)   (atomic_get(&flag) == (atomic_t) true)
-#define WAIT_FOR_FLAG_SET(flag)                                                                    \
-	while (!(bool)atomic_get(&flag)) {                                                         \
-		(void)k_sleep(K_MSEC(1));                                                          \
-	}
-#define WAIT_FOR_FLAG_UNSET(flag)                                                                  \
-	while ((bool)atomic_get(&flag)) {                                                          \
-		(void)k_sleep(K_MSEC(1));                                                          \
-	}
-
-#define WAIT_TIME (30e6) /* 30 seconds*/
-
-#define FAIL(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Failed;                                                               \
-		bs_trace_error_time_line(__VA_ARGS__);                                             \
-	} while (0)
-
-#define PASS(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Passed;                                                               \
-		bs_trace_info_time(1, __VA_ARGS__);                                                \
-	} while (0)
-
 extern struct bt_conn *default_conn;
 extern atomic_t flag_connected;
 extern atomic_t flag_conn_updated;
-
-void test_init(void);
-void test_tick(bs_time_t HW_device_time);
diff --git a/tests/bsim/bluetooth/host/l2cap/credits/CMakeLists.txt b/tests/bsim/bluetooth/host/l2cap/credits/CMakeLists.txt
index c28d99b9d67..1fca2758390 100644
--- a/tests/bsim/bluetooth/host/l2cap/credits/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/l2cap/credits/CMakeLists.txt
@@ -5,6 +5,9 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_l2cap_credits)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 FILE(GLOB app_sources src/*.c)
 target_sources(app PRIVATE ${app_sources} )
 
diff --git a/tests/bsim/bluetooth/host/l2cap/credits/src/common.c b/tests/bsim/bluetooth/host/l2cap/credits/src/common.c
deleted file mode 100644
index 5b344c60571..00000000000
--- a/tests/bsim/bluetooth/host/l2cap/credits/src/common.c
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "common.h"
-
-extern enum bst_result_t bst_result;
-
-void test_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-	bst_result = In_progress;
-}
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i seconds)\n", WAIT_SECONDS);
-	}
-}
diff --git a/tests/bsim/bluetooth/host/l2cap/credits/src/common.h b/tests/bsim/bluetooth/host/l2cap/credits/src/common.h
deleted file mode 100644
index a778b7d5e1c..00000000000
--- a/tests/bsim/bluetooth/host/l2cap/credits/src/common.h
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Common functions and helpers for L2CAP tests
- *
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <stddef.h>
-
-#include <zephyr/types.h>
-#include <zephyr/sys/util.h>
-#include <zephyr/sys/byteorder.h>
-
-#include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/bluetooth/hci.h>
-#include <zephyr/bluetooth/l2cap.h>
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "bstests.h"
-#include "bs_pc_backchannel.h"
-
-extern enum bst_result_t bst_result;
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define UNSET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)false)
-#define TEST_FLAG(flag) (atomic_get(&flag) == (atomic_t)true)
-#define WAIT_FOR_FLAG_SET(flag)		   \
-	while (!(bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1));  \
-	}
-#define WAIT_FOR_FLAG_UNSET(flag)	  \
-	while ((bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-
-
-#define WAIT_SECONDS 30 /* seconds */
-#define WAIT_TIME (WAIT_SECONDS * USEC_PER_SEC) /* microseconds*/
-
-#define FAIL(...)				       \
-	do {					       \
-		bst_result = Failed;		       \
-		bs_trace_error_time_line(__VA_ARGS__); \
-	} while (0)
-
-#define PASS(...)				    \
-	do {					    \
-		bst_result = Passed;		    \
-		bs_trace_info_time(1, __VA_ARGS__); \
-	} while (0)
-
-#define ASSERT(expr, ...) if (!(expr)) {FAIL(__VA_ARGS__); }
-
-void test_init(void);
-void test_tick(bs_time_t HW_device_time);
diff --git a/tests/bsim/bluetooth/host/l2cap/credits/src/main.c b/tests/bsim/bluetooth/host/l2cap/credits/src/main.c
index f35abf350ac..8e7df0f5ade 100644
--- a/tests/bsim/bluetooth/host/l2cap/credits/src/main.c
+++ b/tests/bsim/bluetooth/host/l2cap/credits/src/main.c
@@ -6,15 +6,25 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include "bstests.h"
-#include "common.h"
+#include <stddef.h>
+
+#include <zephyr/types.h>
+#include <zephyr/sys/util.h>
+#include <zephyr/sys/byteorder.h>
+
+#include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/l2cap.h>
+
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 
 #define LOG_MODULE_NAME main
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(LOG_MODULE_NAME, LOG_LEVEL_DBG);
 
-CREATE_FLAG(is_connected);
-CREATE_FLAG(flag_l2cap_connected);
+static DEFINE_FLAG(is_connected);
+static DEFINE_FLAG(flag_l2cap_connected);
 
 #define L2CAP_MPS       CONFIG_BT_L2CAP_TX_MTU
 #define SDU_NUM         3
@@ -44,7 +54,7 @@ int l2cap_chan_send(struct bt_l2cap_chan *chan, uint8_t *data, size_t len)
 	struct net_buf *buf = net_buf_alloc(&sdu_pool, K_NO_WAIT);
 
 	if (buf == NULL) {
-		FAIL("No more memory\n");
+		TEST_FAIL("No more memory");
 		return -ENOMEM;
 	}
 
@@ -53,7 +63,7 @@ int l2cap_chan_send(struct bt_l2cap_chan *chan, uint8_t *data, size_t len)
 
 	int ret = bt_l2cap_chan_send(chan, buf);
 
-	ASSERT(ret >= 0, "Failed sending: err %d", ret);
+	TEST_ASSERT(ret >= 0, "Failed sending: err %d", ret);
 
 	LOG_DBG("sent %d len %d", ret, len);
 	return ret;
@@ -94,7 +104,7 @@ int recv_cb(struct bt_l2cap_chan *chan, struct net_buf *buf)
 	rx_cnt++;
 
 	/* Verify SDU data matches TX'd data. */
-	ASSERT(memcmp(buf->data, tx_data, buf->len) == 0, "RX data doesn't match TX");
+	TEST_ASSERT(memcmp(buf->data, tx_data, buf->len) == 0, "RX data doesn't match TX");
 
 	/* Keep a ref for a few seconds: this will make the allocation fail, as
 	 * there is only 1 buffer in the pool.
@@ -160,7 +170,7 @@ static int l2cap_server_register(bt_security_t sec_level)
 
 	int err = bt_l2cap_server_register(&test_l2cap_server);
 
-	ASSERT(err == 0, "Failed to register l2cap server.");
+	TEST_ASSERT(err == 0, "Failed to register l2cap server.");
 
 	return test_l2cap_server.psm;
 }
@@ -172,7 +182,7 @@ static void connected(struct bt_conn *conn, uint8_t conn_err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (conn_err) {
-		FAIL("Failed to connect to %s (%u)", addr, conn_err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, conn_err);
 		return;
 	}
 
@@ -204,7 +214,7 @@ static void disconnect_device(struct bt_conn *conn, void *data)
 	SET_FLAG(is_connected);
 
 	err = bt_conn_disconnect(conn, BT_HCI_ERR_REMOTE_USER_TERM_CONN);
-	ASSERT(!err, "Failed to initate disconnect (err %d)", err);
+	TEST_ASSERT(!err, "Failed to initate disconnect (err %d)", err);
 
 	LOG_DBG("Waiting for disconnection...");
 	WAIT_FOR_FLAG_UNSET(is_connected);
@@ -222,7 +232,7 @@ static void test_peripheral_main(void)
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Can't enable Bluetooth (err %d)", err);
+		TEST_FAIL("Can't enable Bluetooth (err %d)", err);
 		return;
 	}
 
@@ -230,13 +240,13 @@ static void test_peripheral_main(void)
 	LOG_DBG("Connectable advertising...");
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, NULL, 0, NULL, 0);
 	if (err) {
-		FAIL("Advertising failed to start (err %d)", err);
+		TEST_FAIL("Advertising failed to start (err %d)", err);
 		return;
 	}
 
 	LOG_DBG("Advertising started.");
 	LOG_DBG("Peripheral waiting for connection...");
-	WAIT_FOR_FLAG_SET(is_connected);
+	WAIT_FOR_FLAG(is_connected);
 	LOG_DBG("Peripheral Connected.");
 
 	int psm = l2cap_server_register(BT_SECURITY_L1);
@@ -261,9 +271,9 @@ static void test_peripheral_main(void)
 	bt_conn_foreach(BT_CONN_TYPE_LE, disconnect_device, NULL);
 	LOG_INF("Total received: %d", rx_cnt);
 
-	ASSERT(rx_cnt == SDU_NUM, "Did not receive expected no of SDUs\n");
+	TEST_ASSERT(rx_cnt == SDU_NUM, "Did not receive expected no of SDUs\n");
 
-	PASS("L2CAP CREDITS Peripheral passed\n");
+	TEST_PASS("L2CAP CREDITS Peripheral passed");
 }
 
 static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
@@ -275,7 +285,7 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 
 	err = bt_le_scan_stop();
 	if (err) {
-		FAIL("Stop LE scan failed (err %d)", err);
+		TEST_FAIL("Stop LE scan failed (err %d)", err);
 		return;
 	}
 
@@ -288,7 +298,7 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 	param = BT_LE_CONN_PARAM_DEFAULT;
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, param, &conn);
 	if (err) {
-		FAIL("Create conn failed (err %d)", err);
+		TEST_FAIL("Create conn failed (err %d)", err);
 		return;
 	}
 }
@@ -306,10 +316,10 @@ static void connect_peripheral(void)
 
 	int err = bt_le_scan_start(&scan_param, device_found);
 
-	ASSERT(!err, "Scanning failed to start (err %d)\n", err);
+	TEST_ASSERT(!err, "Scanning failed to start (err %d)\n", err);
 
 	LOG_DBG("Central initiating connection...");
-	WAIT_FOR_FLAG_SET(is_connected);
+	WAIT_FOR_FLAG(is_connected);
 }
 
 static void connect_l2cap_channel(struct bt_conn *conn, void *data)
@@ -323,9 +333,9 @@ static void connect_l2cap_channel(struct bt_conn *conn, void *data)
 	UNSET_FLAG(flag_l2cap_connected);
 
 	err = bt_l2cap_chan_connect(conn, &le_chan->chan, 0x0080);
-	ASSERT(!err, "Error connecting l2cap channel (err %d)\n", err);
+	TEST_ASSERT(!err, "Error connecting l2cap channel (err %d)\n", err);
 
-	WAIT_FOR_FLAG_SET(flag_l2cap_connected);
+	WAIT_FOR_FLAG(flag_l2cap_connected);
 }
 
 static void connect_l2cap_ecred_channel(struct bt_conn *conn, void *data)
@@ -340,9 +350,9 @@ static void connect_l2cap_ecred_channel(struct bt_conn *conn, void *data)
 	UNSET_FLAG(flag_l2cap_connected);
 
 	err = bt_l2cap_ecred_chan_connect(conn, chan_list, 0x0080);
-	ASSERT(!err, "Error connecting l2cap channel (err %d)\n", err);
+	TEST_ASSERT(!err, "Error connecting l2cap channel (err %d)\n", err);
 
-	WAIT_FOR_FLAG_SET(flag_l2cap_connected);
+	WAIT_FOR_FLAG(flag_l2cap_connected);
 }
 
 static void test_central_main(void)
@@ -356,7 +366,7 @@ static void test_central_main(void)
 	}
 
 	err = bt_enable(NULL);
-	ASSERT(err == 0, "Can't enable Bluetooth (err %d)\n", err);
+	TEST_ASSERT(err == 0, "Can't enable Bluetooth (err %d)\n", err);
 	LOG_DBG("Central Bluetooth initialized.");
 
 	connect_peripheral();
@@ -380,22 +390,18 @@ static void test_central_main(void)
 
 	WAIT_FOR_FLAG_UNSET(is_connected);
 	LOG_DBG("Peripheral disconnected.");
-	PASS("L2CAP CREDITS Central passed\n");
+	TEST_PASS("L2CAP CREDITS Central passed");
 }
 
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "peripheral",
 		.test_descr = "Peripheral L2CAP CREDITS",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_peripheral_main
 	},
 	{
 		.test_id = "central",
 		.test_descr = "Central L2CAP CREDITS",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_central_main
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/CMakeLists.txt b/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/CMakeLists.txt
index cf303ae2ef6..40e8bd1e367 100644
--- a/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/CMakeLists.txt
@@ -5,8 +5,10 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_l2cap_credits_seg_recv)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 target_sources(app PRIVATE
-  src/common.c
   src/main.c
   )
 
diff --git a/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/src/common.c b/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/src/common.c
deleted file mode 100644
index 6b607482012..00000000000
--- a/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/src/common.c
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
- * Copyright (c) 2023 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "common.h"
-
-extern enum bst_result_t bst_result;
-
-void test_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-	bst_result = In_progress;
-}
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i seconds)\n", WAIT_SECONDS);
-	}
-}
diff --git a/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/src/common.h b/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/src/common.h
deleted file mode 100644
index c0b7ae353b4..00000000000
--- a/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/src/common.h
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Common functions and helpers for L2CAP tests
- *
- * Copyright (c) 2023 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <stddef.h>
-
-#include <zephyr/types.h>
-#include <zephyr/sys/util.h>
-#include <zephyr/sys/byteorder.h>
-
-#include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/bluetooth/hci.h>
-#include <zephyr/bluetooth/l2cap.h>
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "bstests.h"
-#include "bs_pc_backchannel.h"
-
-extern enum bst_result_t bst_result;
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define UNSET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)false)
-#define TEST_FLAG(flag) (atomic_get(&flag) == (atomic_t)true)
-#define WAIT_FOR_FLAG_SET(flag)		   \
-	while (!(bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1));  \
-	}
-#define WAIT_FOR_FLAG_UNSET(flag)	  \
-	while ((bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-
-
-#define WAIT_SECONDS 30 /* seconds */
-#define WAIT_TIME (WAIT_SECONDS * USEC_PER_SEC) /* microseconds*/
-
-#define FAIL(...)				       \
-	do {					       \
-		bst_result = Failed;		       \
-		bs_trace_error_time_line(__VA_ARGS__); \
-	} while (0)
-
-#define PASS(...)				    \
-	do {					    \
-		bst_result = Passed;		    \
-		bs_trace_info_time(1, __VA_ARGS__); \
-	} while (0)
-
-#define ASSERT(expr, ...) if (!(expr)) {FAIL(__VA_ARGS__); }
-
-void test_init(void);
-void test_tick(bs_time_t HW_device_time);
diff --git a/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/src/main.c b/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/src/main.c
index 1ee69d76585..d06188510c4 100644
--- a/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/src/main.c
+++ b/tests/bsim/bluetooth/host/l2cap/credits_seg_recv/src/main.c
@@ -4,15 +4,25 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include "bstests.h"
-#include "common.h"
+#include <stddef.h>
+
+#include <zephyr/types.h>
+#include <zephyr/sys/util.h>
+#include <zephyr/sys/byteorder.h>
+
+#include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/l2cap.h>
+
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 
 #define LOG_MODULE_NAME main
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(LOG_MODULE_NAME, LOG_LEVEL_DBG);
 
-CREATE_FLAG(is_connected);
-CREATE_FLAG(flag_l2cap_connected);
+static DEFINE_FLAG(is_connected);
+static DEFINE_FLAG(flag_l2cap_connected);
 
 #define L2CAP_MPS CONFIG_BT_L2CAP_TX_MTU
 #define SDU_NUM   3
@@ -44,7 +54,7 @@ int l2cap_chan_send(struct bt_l2cap_chan *chan, uint8_t *data, size_t len)
 	buf = net_buf_alloc(&sdu_pool, K_NO_WAIT);
 
 	if (buf == NULL) {
-		FAIL("No more memory\n");
+		TEST_FAIL("No more memory");
 		return -ENOMEM;
 	}
 
@@ -53,7 +63,7 @@ int l2cap_chan_send(struct bt_l2cap_chan *chan, uint8_t *data, size_t len)
 
 	ret = bt_l2cap_chan_send(chan, buf);
 
-	ASSERT(ret >= 0, "Failed sending: err %d", ret);
+	TEST_ASSERT(ret >= 0, "Failed sending: err %d", ret);
 
 	LOG_DBG("sent %d len %d", ret, len);
 	return ret;
@@ -88,10 +98,11 @@ void recv_cb(struct bt_l2cap_chan *l2cap_chan, size_t sdu_len, off_t seg_offset,
 {
 	LOG_DBG("sdu len %u frag offset %u frag len %u", sdu_len, seg_offset, seg->len);
 
-	ASSERT(sdu_len == sizeof(tx_data), "Recv SDU length does not match send length.");
+	TEST_ASSERT(sdu_len == sizeof(tx_data), "Recv SDU length does not match send length.");
 
 	/* Verify SDU data matches TX'd data. */
-	ASSERT(memcmp(seg->data, &tx_data[seg_offset], seg->len) == 0, "RX data doesn't match TX");
+	TEST_ASSERT(memcmp(seg->data, &tx_data[seg_offset], seg->len) == 0,
+		    "RX data doesn't match TX");
 
 	if (seg_offset + seg->len == sdu_len) {
 		/* Don't give credits right away. The taker of this
@@ -171,7 +182,7 @@ static int l2cap_server_register(bt_security_t sec_level)
 
 	err = bt_l2cap_server_register(&test_l2cap_server);
 
-	ASSERT(err == 0, "Failed to register l2cap server.");
+	TEST_ASSERT(err == 0, "Failed to register l2cap server.");
 
 	return test_l2cap_server.psm;
 }
@@ -183,7 +194,7 @@ static void connected(struct bt_conn *conn, uint8_t conn_err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (conn_err) {
-		FAIL("Failed to connect to %s (%u)", addr, conn_err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, conn_err);
 		return;
 	}
 
@@ -215,7 +226,7 @@ static void disconnect_device(struct bt_conn *conn, void *data)
 	SET_FLAG(is_connected);
 
 	err = bt_conn_disconnect(conn, BT_HCI_ERR_REMOTE_USER_TERM_CONN);
-	ASSERT(!err, "Failed to initate disconnect (err %d)", err);
+	TEST_ASSERT(!err, "Failed to initate disconnect (err %d)", err);
 
 	LOG_DBG("Waiting for disconnection...");
 	WAIT_FOR_FLAG_UNSET(is_connected);
@@ -235,7 +246,7 @@ static void test_peripheral_main(void)
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Can't enable Bluetooth (err %d)", err);
+		TEST_FAIL("Can't enable Bluetooth (err %d)", err);
 		return;
 	}
 
@@ -243,13 +254,13 @@ static void test_peripheral_main(void)
 	LOG_DBG("Connectable advertising...");
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, NULL, 0, NULL, 0);
 	if (err) {
-		FAIL("Advertising failed to start (err %d)", err);
+		TEST_FAIL("Advertising failed to start (err %d)", err);
 		return;
 	}
 
 	LOG_DBG("Advertising started.");
 	LOG_DBG("Peripheral waiting for connection...");
-	WAIT_FOR_FLAG_SET(is_connected);
+	WAIT_FOR_FLAG(is_connected);
 	LOG_DBG("Peripheral Connected.");
 
 	psm = l2cap_server_register(BT_SECURITY_L1);
@@ -274,9 +285,9 @@ static void test_peripheral_main(void)
 	bt_conn_foreach(BT_CONN_TYPE_LE, disconnect_device, NULL);
 	LOG_INF("Total received: %d", rx_cnt);
 
-	ASSERT(rx_cnt == SDU_NUM, "Did not receive expected no of SDUs\n");
+	TEST_ASSERT(rx_cnt == SDU_NUM, "Did not receive expected no of SDUs");
 
-	PASS("L2CAP CREDITS Peripheral passed\n");
+	TEST_PASS("L2CAP CREDITS Peripheral passed");
 }
 
 static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
@@ -289,7 +300,7 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 
 	err = bt_le_scan_stop();
 	if (err) {
-		FAIL("Stop LE scan failed (err %d)", err);
+		TEST_FAIL("Stop LE scan failed (err %d)", err);
 		return;
 	}
 
@@ -300,7 +311,7 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 	param = BT_LE_CONN_PARAM_DEFAULT;
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, param, &conn);
 	if (err) {
-		FAIL("Create conn failed (err %d)", err);
+		TEST_FAIL("Create conn failed (err %d)", err);
 		return;
 	}
 }
@@ -319,10 +330,10 @@ static void connect_peripheral(void)
 
 	err = bt_le_scan_start(&scan_param, device_found);
 
-	ASSERT(!err, "Scanning failed to start (err %d)\n", err);
+	TEST_ASSERT(!err, "Scanning failed to start (err %d)", err);
 
 	LOG_DBG("Central initiating connection...");
-	WAIT_FOR_FLAG_SET(is_connected);
+	WAIT_FOR_FLAG(is_connected);
 }
 
 static void connect_l2cap_channel(struct bt_conn *conn, void *data)
@@ -346,9 +357,9 @@ static void connect_l2cap_channel(struct bt_conn *conn, void *data)
 	bt_l2cap_chan_give_credits(&le_chan->chan, 1);
 
 	err = bt_l2cap_chan_connect(conn, &le_chan->chan, 0x0080);
-	ASSERT(!err, "Error connecting l2cap channel (err %d)\n", err);
+	TEST_ASSERT(!err, "Error connecting l2cap channel (err %d)", err);
 
-	WAIT_FOR_FLAG_SET(flag_l2cap_connected);
+	WAIT_FOR_FLAG(flag_l2cap_connected);
 }
 
 static void connect_l2cap_ecred_channel(struct bt_conn *conn, void *data)
@@ -373,9 +384,9 @@ static void connect_l2cap_ecred_channel(struct bt_conn *conn, void *data)
 	bt_l2cap_chan_give_credits(&le_chan->chan, 1);
 
 	err = bt_l2cap_ecred_chan_connect(conn, chan_list, 0x0080);
-	ASSERT(!err, "Error connecting l2cap channel (err %d)\n", err);
+	TEST_ASSERT(!err, "Error connecting l2cap channel (err %d)", err);
 
-	WAIT_FOR_FLAG_SET(flag_l2cap_connected);
+	WAIT_FOR_FLAG(flag_l2cap_connected);
 }
 
 static void test_central_main(void)
@@ -390,7 +401,7 @@ static void test_central_main(void)
 	}
 
 	err = bt_enable(NULL);
-	ASSERT(err == 0, "Can't enable Bluetooth (err %d)\n", err);
+	TEST_ASSERT(err == 0, "Can't enable Bluetooth (err %d)", err);
 	LOG_DBG("Central Bluetooth initialized.");
 
 	connect_peripheral();
@@ -414,19 +425,15 @@ static void test_central_main(void)
 
 	WAIT_FOR_FLAG_UNSET(is_connected);
 	LOG_DBG("Peripheral disconnected.");
-	PASS("L2CAP CREDITS Central passed\n");
+	TEST_PASS("L2CAP CREDITS Central passed");
 }
 
 static const struct bst_test_instance test_def[] = {
 	{.test_id = "peripheral",
 	 .test_descr = "Peripheral L2CAP CREDITS",
-	 .test_pre_init_f = test_init,
-	 .test_tick_f = test_tick,
 	 .test_main_f = test_peripheral_main},
 	{.test_id = "central",
 	 .test_descr = "Central L2CAP CREDITS",
-	 .test_pre_init_f = test_init,
-	 .test_tick_f = test_tick,
 	 .test_main_f = test_central_main},
 	BSTEST_END_MARKER,
 };
diff --git a/tests/bsim/bluetooth/host/l2cap/general/CMakeLists.txt b/tests/bsim/bluetooth/host/l2cap/general/CMakeLists.txt
index 6adc381f4f5..5ac53e80ae1 100644
--- a/tests/bsim/bluetooth/host/l2cap/general/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/l2cap/general/CMakeLists.txt
@@ -5,6 +5,9 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_l2cap)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 FILE(GLOB app_sources src/*.c)
 target_sources(app PRIVATE ${app_sources} )
 
diff --git a/tests/bsim/bluetooth/host/l2cap/general/src/common.c b/tests/bsim/bluetooth/host/l2cap/general/src/common.c
deleted file mode 100644
index 648b58f271b..00000000000
--- a/tests/bsim/bluetooth/host/l2cap/general/src/common.c
+++ /dev/null
@@ -1,68 +0,0 @@
-/*
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "common.h"
-
-#define LOG_MODULE_NAME common
-
-#include <zephyr/logging/log.h>
-
-LOG_MODULE_REGISTER(LOG_MODULE_NAME, LOG_LEVEL_DBG);
-
-extern enum bst_result_t bst_result;
-
-void test_init(void)
-{
-	bst_result = In_progress;
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-}
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i us)\n", WAIT_TIME);
-	}
-}
-
-/* Call in init functions*/
-void device_sync_init(uint device_nbr)
-{
-	uint peer = CENTRAL_ID;
-
-	if (device_nbr == CENTRAL_ID) {
-		peer = PERIPHERAL_ID;
-	}
-
-	uint dev_nbrs[BACK_CHANNELS] = {peer};
-	uint channel_nbrs[BACK_CHANNELS] = {0};
-	uint *ch = bs_open_back_channel(device_nbr, dev_nbrs, channel_nbrs, BACK_CHANNELS);
-
-	if (!ch) {
-		LOG_ERR("bs_open_back_channel failed!");
-	}
-}
-
-/* Call it to make peer to proceed.*/
-void device_sync_send(void)
-{
-	uint8_t msg[1] = "S";
-
-	bs_bc_send_msg(0, msg, sizeof(msg));
-}
-
-/* Wait until peer send sync*/
-void device_sync_wait(void)
-{
-	int size_msg_received = 0;
-	uint8_t msg;
-
-	while (!size_msg_received) {
-		size_msg_received = bs_bc_is_msg_received(0);
-		k_sleep(K_MSEC(1));
-	}
-
-	bs_bc_receive_msg(0, &msg, size_msg_received);
-}
diff --git a/tests/bsim/bluetooth/host/l2cap/general/src/common.h b/tests/bsim/bluetooth/host/l2cap/general/src/common.h
deleted file mode 100644
index a399786bfd2..00000000000
--- a/tests/bsim/bluetooth/host/l2cap/general/src/common.h
+++ /dev/null
@@ -1,59 +0,0 @@
-/*
- * Common functions and helpers for L2CAP tests
- *
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <stddef.h>
-
-#include <zephyr/types.h>
-#include <zephyr/sys/util.h>
-#include <zephyr/sys/byteorder.h>
-
-#include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/bluetooth/hci.h>
-#include <zephyr/bluetooth/l2cap.h>
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "bstests.h"
-#include "bs_pc_backchannel.h"
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define UNSET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)false)
-#define TEST_FLAG(flag) (atomic_get(&flag) == (atomic_t)true)
-#define WAIT_FOR_FLAG_SET(flag)		   \
-	while (!(bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1));  \
-	}
-#define WAIT_FOR_FLAG_UNSET(flag)	  \
-	while ((bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-
-
-#define WAIT_TIME (60e6) /* 60 seconds*/
-
-#define FAIL(...)				       \
-	do {					       \
-		bst_result = Failed;		       \
-		bs_trace_error_time_line(__VA_ARGS__); \
-	} while (0)
-
-#define PASS(...)				    \
-	do {					    \
-		bst_result = Passed;		    \
-		bs_trace_info_time(1, __VA_ARGS__); \
-	} while (0)
-
-#define CENTRAL_ID 0
-#define PERIPHERAL_ID 1
-#define BACK_CHANNELS 1
-
-void test_init(void);
-void test_tick(bs_time_t HW_device_time);
-void device_sync_init(uint device_nbr);
-void device_sync_send(void);
-void device_sync_wait(void);
diff --git a/tests/bsim/bluetooth/host/l2cap/general/src/main_l2cap_ecred.c b/tests/bsim/bluetooth/host/l2cap/general/src/main_l2cap_ecred.c
index 06135e030a5..4cd2f619ff7 100644
--- a/tests/bsim/bluetooth/host/l2cap/general/src/main_l2cap_ecred.c
+++ b/tests/bsim/bluetooth/host/l2cap/general/src/main_l2cap_ecred.c
@@ -6,7 +6,19 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include "common.h"
+#include <stddef.h>
+
+#include <zephyr/types.h>
+#include <zephyr/sys/util.h>
+#include <zephyr/sys/byteorder.h>
+
+#include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/l2cap.h>
+
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
+#include "babblekit/sync.h"
 
 #define LOG_MODULE_NAME main_l2cap_ecred
 #include <zephyr/logging/log.h>
@@ -54,8 +66,8 @@ struct channel {
 };
 static struct channel channels[L2CAP_CHANNELS];
 
-CREATE_FLAG(is_connected);
-CREATE_FLAG(unsequenced_data);
+static DEFINE_FLAG(is_connected);
+static DEFINE_FLAG(unsequenced_data);
 
 #define T_STACK_SIZE 512
 #define T_PRIORITY 5
@@ -90,22 +102,23 @@ static int chan_recv_cb(struct bt_l2cap_chan *l2cap_chan, struct net_buf *buf)
 
 	LOG_DBG("received_iterration %i sdus_received %i, chan_id: %d, data_length: %d",
 		received_iterration, chan->sdus_received, chan->chan_id, buf->len);
-	if (!TEST_FLAG(unsequenced_data) && received_iterration != chan->sdus_received) {
-		FAIL("Received out of sequence data.");
+	if (!IS_FLAG_SET(unsequenced_data) && received_iterration != chan->sdus_received) {
+		TEST_FAIL("Received out of sequence data.");
 	}
 
 	const int retval = memcmp(buf->data + sizeof(received_iterration),
 			    chan->payload + sizeof(received_iterration),
 			    buf->len - sizeof(received_iterration));
 	if (retval) {
-		FAIL("Payload received didn't match expected value memcmp returned %i", retval);
+		TEST_FAIL("Payload received didn't match expected value memcmp returned %i",
+			  retval);
 	}
 
 	/*By the time we rx on long msg channel we should have already rx on short msg channel*/
 	if (chan->chan_id == 0) {
 		if (channels[SHORT_MSG_CHAN_IDX].sdus_received !=
 			(channels[LONG_MSG_CHAN_IDX].sdus_received + 1)) {
-			FAIL("Didn't receive on short msg channel first");
+			TEST_FAIL("Didn't receive on short msg channel first");
 		}
 	}
 
@@ -232,7 +245,7 @@ static void connect_num_channels(uint8_t num_l2cap_channels)
 		struct channel *chan = get_free_channel();
 
 		if (!chan) {
-			FAIL("failed, chan not free");
+			TEST_FAIL("failed, chan not free");
 			return;
 		}
 
@@ -243,7 +256,7 @@ static void connect_num_channels(uint8_t num_l2cap_channels)
 						     servers[0].psm);
 
 	if (err) {
-		FAIL("can't connect ecred %d ", err);
+		TEST_FAIL("can't connect ecred %d ", err);
 	}
 }
 
@@ -297,7 +310,7 @@ static void register_l2cap_server(void)
 
 	server = get_free_server();
 	if (!server) {
-		FAIL("Failed to get free server");
+		TEST_FAIL("Failed to get free server");
 		return;
 	}
 
@@ -305,7 +318,7 @@ static void register_l2cap_server(void)
 	server->psm = 0;
 
 	if (bt_l2cap_server_register(server) < 0) {
-		FAIL("Failed to get free server");
+		TEST_FAIL("Failed to get free server");
 		return;
 	}
 
@@ -319,7 +332,7 @@ static void connected(struct bt_conn *conn, uint8_t conn_err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (conn_err) {
-		FAIL("Failed to connect to %s (%u)", addr, conn_err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, conn_err);
 		bt_conn_unref(default_conn);
 		default_conn = NULL;
 		return;
@@ -340,7 +353,7 @@ static void disconnected(struct bt_conn *conn, uint8_t reason)
 	LOG_DBG("%s (reason 0x%02x)", addr, reason);
 
 	if (default_conn != conn) {
-		FAIL("Conn mismatch disconnect %s %s)", default_conn, conn);
+		TEST_FAIL("Conn mismatch disconnect %s %s)", default_conn, conn);
 		return;
 	}
 
@@ -363,7 +376,7 @@ static void send_sdu(int iteration, int chan_idx, int bytes)
 	sys_put_le32(iteration, channels[chan_idx].payload);
 
 	if (channels[chan_idx].buf != 0) {
-		FAIL("Buf should have been deallocated by now");
+		TEST_FAIL("Buf should have been deallocated by now");
 		return;
 	}
 
@@ -374,7 +387,7 @@ static void send_sdu(int iteration, int chan_idx, int bytes)
 	}
 
 	if (buf == NULL) {
-		FAIL("Failed to get buff on ch %i, iteration %i should never happen", chan_idx,
+		TEST_FAIL("Failed to get buff on ch %i, iteration %i should never happen", chan_idx,
 		     chan_idx);
 	}
 
@@ -388,7 +401,7 @@ static void send_sdu(int iteration, int chan_idx, int bytes)
 	LOG_DBG("bt_l2cap_chan_send returned: %i", ret);
 
 	if (ret < 0) {
-		FAIL("Error: send failed error: %i", ret);
+		TEST_FAIL("Error: send failed error: %i", ret);
 		channels[chan_idx].buf = 0;
 		net_buf_unref(buf);
 	}
@@ -412,7 +425,7 @@ static void send_sdu_concurrently(void)
 								&channels[k].work);
 
 			if (err < 0) {
-				FAIL("Failed to submit work to the queue, error: %d", err);
+				TEST_FAIL("Failed to submit work to the queue, error: %d", err);
 			}
 		}
 
@@ -436,14 +449,14 @@ static int change_mtu_on_channels(int num_channels, int new_mtu)
 
 static void test_peripheral_main(void)
 {
-	device_sync_init(PERIPHERAL_ID);
+	TEST_ASSERT(bk_sync_init() == 0, "Failed to open backchannel");
 	LOG_DBG("*L2CAP ECRED Peripheral started*");
 	init_workqs();
 	int err;
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Can't enable Bluetooth (err %d)", err);
+		TEST_FAIL("Can't enable Bluetooth (err %d)", err);
 		return;
 	}
 
@@ -451,13 +464,13 @@ static void test_peripheral_main(void)
 	LOG_DBG("Connectable advertising...");
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, ad, ARRAY_SIZE(ad), NULL, 0);
 	if (err) {
-		FAIL("Advertising failed to start (err %d)", err);
+		TEST_FAIL("Advertising failed to start (err %d)", err);
 		return;
 	}
 
 	LOG_DBG("Advertising started.");
 	LOG_DBG("Peripheral waiting for connection...");
-	WAIT_FOR_FLAG_SET(is_connected);
+	WAIT_FOR_FLAG(is_connected);
 	LOG_DBG("Peripheral Connected.");
 	register_l2cap_server();
 	connect_num_channels(L2CAP_CHANNELS);
@@ -472,7 +485,7 @@ static void test_peripheral_main(void)
 	k_sem_take(&all_chan_conn_sem, K_FOREVER);
 
 	LOG_DBG("Send sync after reconnection");
-	device_sync_send();
+	bk_sync_send();
 
 	/* Send bytes on both channels and expect ch 1 to receive all of them before ch 0 *********/
 	LOG_DBG("############# Send bytes on both channels concurrently");
@@ -483,20 +496,20 @@ static void test_peripheral_main(void)
 	err = change_mtu_on_channels(L2CAP_CHANNELS, CONFIG_BT_L2CAP_TX_MTU + 10);
 
 	if (err) {
-		FAIL("MTU change failed (err %d)\n", err);
+		TEST_FAIL("MTU change failed (err %d)", err);
 	}
 
 	/* Read from both devices (Central and Peripheral) at the same time **********************/
 	LOG_DBG("############# Read from both devices (Central and Peripheral) at the same time");
 	LOG_DBG("Wait for sync before sending the msg");
-	device_sync_wait();
+	bk_sync_wait();
 	LOG_DBG("Received sync");
 	send_sdu(0, 1, 10);
 
 	k_sem_take(&sent_sem, K_FOREVER);
 	disconnect_all_channels();
 	WAIT_FOR_FLAG_UNSET(is_connected);
-	PASS("L2CAP ECRED Peripheral tests Passed");
+	TEST_PASS("L2CAP ECRED Peripheral tests Passed");
 	bs_trace_silent_exit(0);
 }
 
@@ -508,14 +521,14 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 
 	err = bt_le_scan_stop();
 	if (err) {
-		FAIL("Stop LE scan failed (err %d)", err);
+		TEST_FAIL("Stop LE scan failed (err %d)", err);
 		return;
 	}
 
 	param = BT_LE_CONN_PARAM_DEFAULT;
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, param, &default_conn);
 	if (err) {
-		FAIL("Create conn failed (err %d)", err);
+		TEST_FAIL("Create conn failed (err %d)", err);
 		return;
 	}
 }
@@ -529,40 +542,40 @@ static void test_central_main(void)
 		.window = BT_GAP_SCAN_FAST_WINDOW,
 	};
 
-	device_sync_init(CENTRAL_ID);
+	TEST_ASSERT(bk_sync_init() == 0, "Failed to open backchannel");
 
 	LOG_DBG("*L2CAP ECRED Central started*");
 	int err;
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Can't enable Bluetooth (err %d)\n", err);
+		TEST_FAIL("Can't enable Bluetooth (err %d)", err);
 		return;
 	}
 	LOG_DBG("Central Bluetooth initialized.\n");
 
 	err = bt_le_scan_start(&scan_param, device_found);
 	if (err) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 		return;
 	}
 
 	LOG_DBG("Scanning successfully started\n");
 
 	LOG_DBG("Central waiting for connection...\n");
-	WAIT_FOR_FLAG_SET(is_connected);
+	WAIT_FOR_FLAG(is_connected);
 	LOG_DBG("Central Connected.\n");
 	register_l2cap_server();
 
 	LOG_DBG("Wait for sync after reconnection");
-	device_sync_wait();
+	bk_sync_wait();
 	LOG_DBG("Received sync");
 
 	/* Read from both devices (Central and Peripheral) at the same time **********************/
 	LOG_DBG("############# Read from both devices (Central and Peripheral) at the same time");
 	LOG_DBG("Send sync for SDU send");
 	SET_FLAG(unsequenced_data);
-	device_sync_send();
+	bk_sync_send();
 	send_sdu(0, 1, 10);
 
 	/* Wait until all of the channels are disconnected */
@@ -577,7 +590,7 @@ static void test_central_main(void)
 
 	if (channels[LONG_MSG_CHAN_IDX].sdus_received < SDU_SEND_COUNT ||
 	    channels[SHORT_MSG_CHAN_IDX].sdus_received < SDU_SEND_COUNT) {
-		FAIL("received less than %i", SDU_SEND_COUNT);
+		TEST_FAIL("received less than %i", SDU_SEND_COUNT);
 	}
 
 	/* Disconnect */
@@ -587,28 +600,24 @@ static void test_central_main(void)
 	LOG_DBG("Central tried to disconnect");
 
 	if (err) {
-		FAIL("Disconnection failed (err %d)", err);
+		TEST_FAIL("Disconnection failed (err %d)", err);
 		return;
 	}
 
 	LOG_DBG("Central Disconnected.");
 
-	PASS("L2CAP ECRED Central tests Passed\n");
+	TEST_PASS("L2CAP ECRED Central tests Passed");
 }
 
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "peripheral",
 		.test_descr = "Peripheral L2CAP ECRED",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_peripheral_main
 	},
 	{
 		.test_id = "central",
 		.test_descr = "Central L2CAP ECRED",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_central_main
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/l2cap/many_conns/CMakeLists.txt b/tests/bsim/bluetooth/host/l2cap/many_conns/CMakeLists.txt
index 88c326dddf3..383f54c095c 100644
--- a/tests/bsim/bluetooth/host/l2cap/many_conns/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/l2cap/many_conns/CMakeLists.txt
@@ -5,6 +5,9 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_l2cap_stress)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 FILE(GLOB app_sources src/*.c)
 target_sources(app PRIVATE ${app_sources} )
 
diff --git a/tests/bsim/bluetooth/host/l2cap/many_conns/src/common.c b/tests/bsim/bluetooth/host/l2cap/many_conns/src/common.c
deleted file mode 100644
index c6679d83494..00000000000
--- a/tests/bsim/bluetooth/host/l2cap/many_conns/src/common.c
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
- * Copyright (c) 2024 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "common.h"
-
-extern enum bst_result_t bst_result;
-
-void test_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-	bst_result = In_progress;
-}
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i seconds)\n", WAIT_SECONDS);
-	}
-}
diff --git a/tests/bsim/bluetooth/host/l2cap/many_conns/src/common.h b/tests/bsim/bluetooth/host/l2cap/many_conns/src/common.h
deleted file mode 100644
index 2ce0288975d..00000000000
--- a/tests/bsim/bluetooth/host/l2cap/many_conns/src/common.h
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Common functions and helpers for L2CAP tests
- *
- * Copyright (c) 2024 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <stddef.h>
-
-#include <zephyr/types.h>
-#include <zephyr/sys/util.h>
-#include <zephyr/sys/byteorder.h>
-
-#include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/bluetooth/hci.h>
-#include <zephyr/bluetooth/l2cap.h>
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "bstests.h"
-#include "bs_pc_backchannel.h"
-
-extern enum bst_result_t bst_result;
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define UNSET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)false)
-#define TEST_FLAG(flag) (atomic_get(&flag) == (atomic_t)true)
-#define WAIT_FOR_FLAG_SET(flag)		   \
-	while (!(bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1));  \
-	}
-#define WAIT_FOR_FLAG_UNSET(flag)	  \
-	while ((bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-
-
-#define WAIT_SECONDS 400                        /* seconds */
-#define WAIT_TIME (WAIT_SECONDS * USEC_PER_SEC) /* microseconds*/
-
-#define FAIL(...)				       \
-	do {					       \
-		bst_result = Failed;		       \
-		bs_trace_error_time_line(__VA_ARGS__); \
-	} while (0)
-
-#define PASS(...)				    \
-	do {					    \
-		bst_result = Passed;		    \
-		bs_trace_info_time(1, __VA_ARGS__); \
-	} while (0)
-
-#define ASSERT(expr, ...) if (!(expr)) {FAIL(__VA_ARGS__); }
-
-void test_init(void);
-void test_tick(bs_time_t HW_device_time);
diff --git a/tests/bsim/bluetooth/host/l2cap/many_conns/src/main.c b/tests/bsim/bluetooth/host/l2cap/many_conns/src/main.c
index 04825306285..174d3739086 100644
--- a/tests/bsim/bluetooth/host/l2cap/many_conns/src/main.c
+++ b/tests/bsim/bluetooth/host/l2cap/many_conns/src/main.c
@@ -6,15 +6,25 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include "bstests.h"
-#include "common.h"
+#include <stddef.h>
+
+#include <zephyr/types.h>
+#include <zephyr/sys/util.h>
+#include <zephyr/sys/byteorder.h>
+
+#include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/l2cap.h>
+
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 
 #define LOG_MODULE_NAME main
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(LOG_MODULE_NAME, LOG_LEVEL_INF);
 
-CREATE_FLAG(is_connected);
-CREATE_FLAG(flag_l2cap_connected);
+static DEFINE_FLAG(is_connected);
+static DEFINE_FLAG(flag_l2cap_connected);
 
 #define NUM_PERIPHERALS CONFIG_BT_MAX_CONN
 #define L2CAP_CHANS     NUM_PERIPHERALS
@@ -47,7 +57,7 @@ struct test_ctx *get_ctx(struct bt_l2cap_chan *chan)
 	struct bt_l2cap_le_chan *le_chan = CONTAINER_OF(chan, struct bt_l2cap_le_chan, chan);
 	struct test_ctx *ctx = CONTAINER_OF(le_chan, struct test_ctx, le_chan);
 
-	ASSERT(ctx >= &contexts[0] &&
+	TEST_ASSERT(ctx >= &contexts[0] &&
 	       ctx <= &contexts[L2CAP_CHANS], "memory corruption");
 
 	return ctx;
@@ -59,14 +69,14 @@ int l2cap_chan_send(struct bt_l2cap_chan *chan, uint8_t *data, size_t len)
 
 	struct net_buf *buf = net_buf_alloc(&sdu_tx_pool, K_NO_WAIT);
 
-	ASSERT(buf, "No more memory\n");
+	TEST_ASSERT(buf, "No more memory");
 
 	net_buf_reserve(buf, BT_L2CAP_SDU_CHAN_SEND_RESERVE);
 	net_buf_add_mem(buf, data, len);
 
 	int ret = bt_l2cap_chan_send(chan, buf);
 
-	ASSERT(ret >= 0, "Failed sending: err %d", ret);
+	TEST_ASSERT(ret >= 0, "Failed sending: err %d", ret);
 
 	LOG_DBG("sent %d len %d", ret, len);
 	return ret;
@@ -187,7 +197,7 @@ static int l2cap_server_register(bt_security_t sec_level)
 
 	int err = bt_l2cap_server_register(&test_l2cap_server);
 
-	ASSERT(err == 0, "Failed to register l2cap server.");
+	TEST_ASSERT(err == 0, "Failed to register l2cap server.");
 
 	return test_l2cap_server.psm;
 }
@@ -198,7 +208,7 @@ static void connected(struct bt_conn *conn, uint8_t conn_err)
 
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
-	ASSERT(!conn_err, "Failed to connect to %s (%u)", addr, conn_err);
+	TEST_ASSERT(!conn_err, "Failed to connect to %s (%u)", addr, conn_err);
 
 	LOG_DBG("%s", addr);
 
@@ -229,7 +239,7 @@ static void disconnect_device(struct bt_conn *conn, void *data)
 	SET_FLAG(is_connected);
 
 	err = bt_conn_disconnect(conn, BT_HCI_ERR_REMOTE_USER_TERM_CONN);
-	ASSERT(!err, "Failed to initate disconnect (err %d)", err);
+	TEST_ASSERT(!err, "Failed to initate disconnect (err %d)", err);
 
 	LOG_DBG("Waiting for disconnection...");
 	WAIT_FOR_FLAG_UNSET(is_connected);
@@ -246,16 +256,16 @@ static void test_peripheral_main(void)
 	}
 
 	err = bt_enable(NULL);
-	ASSERT(!err, "Can't enable Bluetooth (err %d)", err);
+	TEST_ASSERT(!err, "Can't enable Bluetooth (err %d)", err);
 
 	LOG_DBG("Peripheral Bluetooth initialized.");
 	LOG_DBG("Connectable advertising...");
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, NULL, 0, NULL, 0);
-	ASSERT(!err, "Advertising failed to start (err %d)", err);
+	TEST_ASSERT(!err, "Advertising failed to start (err %d)", err);
 
 	LOG_DBG("Advertising started.");
 	LOG_DBG("Peripheral waiting for connection...");
-	WAIT_FOR_FLAG_SET(is_connected);
+	WAIT_FOR_FLAG(is_connected);
 	LOG_DBG("Peripheral Connected.");
 
 	int psm = l2cap_server_register(BT_SECURITY_L1);
@@ -271,9 +281,9 @@ static void test_peripheral_main(void)
 	WAIT_FOR_FLAG_UNSET(is_connected);
 	LOG_INF("Total received: %d", rx_cnt);
 
-	ASSERT(rx_cnt == SDU_NUM, "Did not receive expected no of SDUs\n");
+	TEST_ASSERT(rx_cnt == SDU_NUM, "Did not receive expected no of SDUs");
 
-	PASS("L2CAP LATENCY Peripheral passed\n");
+	TEST_PASS("L2CAP LATENCY Peripheral passed");
 }
 
 static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
@@ -284,7 +294,7 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 	int err;
 
 	err = bt_le_scan_stop();
-	ASSERT(!err, "Stop LE scan failed (err %d)", err);
+	TEST_ASSERT(!err, "Stop LE scan failed (err %d)", err);
 
 	char str[BT_ADDR_LE_STR_LEN];
 
@@ -294,7 +304,7 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 
 	param = BT_LE_CONN_PARAM_DEFAULT;
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, param, &conn);
-	ASSERT(!err, "Create conn failed (err %d)", err);
+	TEST_ASSERT(!err, "Create conn failed (err %d)", err);
 }
 
 static void connect_peripheral(void)
@@ -310,10 +320,10 @@ static void connect_peripheral(void)
 
 	int err = bt_le_scan_start(&scan_param, device_found);
 
-	ASSERT(!err, "Scanning failed to start (err %d)\n", err);
+	TEST_ASSERT(!err, "Scanning failed to start (err %d)", err);
 
 	LOG_DBG("Central initiating connection...");
-	WAIT_FOR_FLAG_SET(is_connected);
+	WAIT_FOR_FLAG(is_connected);
 }
 
 static void connect_l2cap_channel(struct bt_conn *conn, void *data)
@@ -321,7 +331,7 @@ static void connect_l2cap_channel(struct bt_conn *conn, void *data)
 	int err;
 	struct test_ctx *ctx = alloc_test_context();
 
-	ASSERT(ctx, "No more available test contexts\n");
+	TEST_ASSERT(ctx, "No more available test contexts");
 
 	struct bt_l2cap_le_chan *le_chan = &ctx->le_chan;
 
@@ -330,9 +340,9 @@ static void connect_l2cap_channel(struct bt_conn *conn, void *data)
 	UNSET_FLAG(flag_l2cap_connected);
 
 	err = bt_l2cap_chan_connect(conn, &le_chan->chan, 0x0080);
-	ASSERT(!err, "Error connecting l2cap channel (err %d)\n", err);
+	TEST_ASSERT(!err, "Error connecting l2cap channel (err %d)", err);
 
-	WAIT_FOR_FLAG_SET(flag_l2cap_connected);
+	WAIT_FOR_FLAG(flag_l2cap_connected);
 }
 
 #define L2CAP_LE_CID_DYN_START	0x0040
@@ -363,8 +373,7 @@ void bt_test_l2cap_data_pull_spy(struct bt_conn *conn,
 		return;
 	}
 
-	ASSERT(uptime == last_pull_time,
-	       "Too much delay servicing ready channels\n");
+	TEST_ASSERT(uptime == last_pull_time, "Too much delay servicing ready channels");
 }
 
 static void test_central_main(void)
@@ -378,7 +387,7 @@ static void test_central_main(void)
 	}
 
 	err = bt_enable(NULL);
-	ASSERT(err == 0, "Can't enable Bluetooth (err %d)\n", err);
+	TEST_ASSERT(err == 0, "Can't enable Bluetooth (err %d)", err);
 	LOG_DBG("Central Bluetooth initialized.");
 
 	/* Connect all peripherals */
@@ -407,7 +416,7 @@ static void test_central_main(void)
 	LOG_DBG("Wait until all transfers are completed.");
 	int remaining_tx_total;
 
-	/* Assertion that the `pull` callback gets serviced for all connections
+	/* TEST_Assertion that the `pull` callback gets serviced for all connections
 	 * at the same time is handled in bt_l2cap_data_pull_spy().
 	 */
 
@@ -426,22 +435,18 @@ static void test_central_main(void)
 	}
 	LOG_DBG("All peripherals disconnected.");
 
-	PASS("L2CAP LATENCY Central passed\n");
+	TEST_PASS("L2CAP LATENCY Central passed");
 }
 
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "peripheral",
 		.test_descr = "Peripheral L2CAP LATENCY",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_peripheral_main
 	},
 	{
 		.test_id = "central",
 		.test_descr = "Central L2CAP LATENCY",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_central_main
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/l2cap/send_on_connect/CMakeLists.txt b/tests/bsim/bluetooth/host/l2cap/send_on_connect/CMakeLists.txt
index f6db9d424e2..5a5dd7ab174 100644
--- a/tests/bsim/bluetooth/host/l2cap/send_on_connect/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/l2cap/send_on_connect/CMakeLists.txt
@@ -5,8 +5,10 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_l2cap_send_on_connect)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 target_sources(app PRIVATE
-  src/common.c
   src/main_l2cap_send_on_connect.c
   src/main.c
 )
diff --git a/tests/bsim/bluetooth/host/l2cap/send_on_connect/src/common.c b/tests/bsim/bluetooth/host/l2cap/send_on_connect/src/common.c
deleted file mode 100644
index f725ac6129c..00000000000
--- a/tests/bsim/bluetooth/host/l2cap/send_on_connect/src/common.c
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "common.h"
-
-extern enum bst_result_t bst_result;
-
-void test_init(void)
-{
-	bst_result = In_progress;
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-}
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i us)\n", WAIT_TIME);
-	}
-}
diff --git a/tests/bsim/bluetooth/host/l2cap/send_on_connect/src/common.h b/tests/bsim/bluetooth/host/l2cap/send_on_connect/src/common.h
deleted file mode 100644
index 3b0d09c53b6..00000000000
--- a/tests/bsim/bluetooth/host/l2cap/send_on_connect/src/common.h
+++ /dev/null
@@ -1,44 +0,0 @@
-/*
- * Common functions and helpers for L2CAP tests
- *
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <stddef.h>
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "bstests.h"
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define UNSET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)false)
-#define WAIT_FOR_FLAG_SET(flag)		   \
-	while (!(bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1));  \
-	}
-#define WAIT_FOR_FLAG_UNSET(flag)	  \
-	while ((bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-
-
-#define WAIT_TIME (30e6) /* 30 seconds*/
-
-#define FAIL(...)				       \
-	do {					       \
-		bst_result = Failed;		       \
-		bs_trace_error_time_line(__VA_ARGS__); \
-	} while (0)
-
-#define PASS(...)				    \
-	do {					    \
-		bst_result = Passed;		    \
-		bs_trace_info_time(1, __VA_ARGS__); \
-	} while (0)
-
-
-void test_init(void);
-void test_tick(bs_time_t HW_device_time);
diff --git a/tests/bsim/bluetooth/host/l2cap/send_on_connect/src/main_l2cap_send_on_connect.c b/tests/bsim/bluetooth/host/l2cap/send_on_connect/src/main_l2cap_send_on_connect.c
index 9fd1c4bfcb8..825a8a74a2e 100644
--- a/tests/bsim/bluetooth/host/l2cap/send_on_connect/src/main_l2cap_send_on_connect.c
+++ b/tests/bsim/bluetooth/host/l2cap/send_on_connect/src/main_l2cap_send_on_connect.c
@@ -4,20 +4,22 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include "common.h"
-
+#include <stddef.h>
 #include <zephyr/bluetooth/bluetooth.h>
 #include <zephyr/bluetooth/l2cap.h>
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
+
 extern enum bst_result_t bst_result;
 
 static struct bt_conn *default_conn;
 
 #define PSM 0x80
 
-CREATE_FLAG(is_connected);
-CREATE_FLAG(chan_connected);
-CREATE_FLAG(data_received);
+static DEFINE_FLAG(is_connected);
+static DEFINE_FLAG(chan_connected);
+static DEFINE_FLAG(data_received);
 
 #define DATA_BYTE_VAL  0xBB
 
@@ -32,7 +34,7 @@ static void chan_connected_cb(struct bt_l2cap_chan *l2cap_chan)
 	/* Send data immediately on L2CAP connection */
 	buf = net_buf_alloc(&buf_pool, K_NO_WAIT);
 	if (!buf) {
-		FAIL("Buffer allocation failed\n");
+		TEST_FAIL("Buffer allocation failed");
 	}
 
 	(void)net_buf_reserve(buf, BT_L2CAP_SDU_CHAN_SEND_RESERVE);
@@ -41,7 +43,7 @@ static void chan_connected_cb(struct bt_l2cap_chan *l2cap_chan)
 	/* Try to send data */
 	err = bt_l2cap_chan_send(l2cap_chan, buf);
 	if (err < 0) {
-		FAIL("Could not send data, error %d\n", err);
+		TEST_FAIL("Could not send data, error %d", err);
 	}
 
 	SET_FLAG(chan_connected);
@@ -59,7 +61,7 @@ static int chan_recv_cb(struct bt_l2cap_chan *chan, struct net_buf *buf)
 	(void)chan;
 
 	if ((buf->len != 1) || (buf->data[0] != DATA_BYTE_VAL)) {
-		FAIL("Unexpected data received");
+		TEST_FAIL("Unexpected data received");
 	}
 
 	SET_FLAG(data_received);
@@ -100,12 +102,12 @@ static void connect_l2cap_channel(void)
 	if (IS_ENABLED(CONFIG_BT_L2CAP_ECRED)) {
 		err = bt_l2cap_ecred_chan_connect(default_conn, chans, server.psm);
 		if (err) {
-			FAIL("Failed to send ecred connection request (err %d)\n", err);
+			TEST_FAIL("Failed to send ecred connection request (err %d)", err);
 		}
 	} else {
 		err = bt_l2cap_chan_connect(default_conn, &channel.chan, server.psm);
 		if (err) {
-			FAIL("Failed to send connection request (err %d)\n", err);
+			TEST_FAIL("Failed to send connection request (err %d)", err);
 		}
 	}
 }
@@ -116,7 +118,7 @@ static void register_l2cap_server(void)
 
 	err = bt_l2cap_server_register(&server);
 	if (err < 0) {
-		FAIL("Failed to get free server (err %d)\n");
+		TEST_FAIL("Failed to get free server (err %d)", err);
 		return;
 	}
 }
@@ -124,7 +126,7 @@ static void register_l2cap_server(void)
 static void connected(struct bt_conn *conn, uint8_t err)
 {
 	if (err) {
-		FAIL("Failed to connect (err %d)\n", err);
+		TEST_FAIL("Failed to connect (err %d)", err);
 		bt_conn_unref(default_conn);
 		default_conn = NULL;
 		return;
@@ -138,7 +140,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 static void disconnected(struct bt_conn *conn, uint8_t reason)
 {
 	if (default_conn != conn) {
-		FAIL("Connection mismatch %p %p)\n", default_conn, conn);
+		TEST_FAIL("Connection mismatch %p %p)", default_conn, conn);
 		return;
 	}
 
@@ -160,14 +162,14 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 
 	err = bt_le_scan_stop();
 	if (err) {
-		FAIL("Failed to stop scanning (err %d)\n", err);
+		TEST_FAIL("Failed to stop scanning (err %d)", err);
 		return;
 	}
 
 	param = BT_LE_CONN_PARAM_DEFAULT;
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, param, &default_conn);
 	if (err) {
-		FAIL("Failed to create connection (err %d)\n", err);
+		TEST_FAIL("Failed to create connection (err %d)", err);
 		return;
 	}
 }
@@ -181,7 +183,7 @@ static void test_peripheral_main(void)
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 		return;
 	}
 
@@ -189,19 +191,19 @@ static void test_peripheral_main(void)
 
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, ad, ARRAY_SIZE(ad), NULL, 0);
 	if (err != 0) {
-		FAIL("Advertising failed to start (err %d)\n", err);
+		TEST_FAIL("Advertising failed to start (err %d)", err);
 		return;
 	}
 
-	WAIT_FOR_FLAG_SET(is_connected);
+	WAIT_FOR_FLAG(is_connected);
 
-	WAIT_FOR_FLAG_SET(chan_connected);
+	WAIT_FOR_FLAG(chan_connected);
 
-	WAIT_FOR_FLAG_SET(data_received);
+	WAIT_FOR_FLAG(data_received);
 
 	WAIT_FOR_FLAG_UNSET(is_connected);
 
-	PASS("Test passed\n");
+TEST_PASS("Test passed");
 }
 
 static void test_central_main(void)
@@ -210,45 +212,41 @@ static void test_central_main(void)
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 	}
 
 	err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
 	if (err != 0) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 	}
 
-	WAIT_FOR_FLAG_SET(is_connected);
+	WAIT_FOR_FLAG(is_connected);
 
 	connect_l2cap_channel();
-	WAIT_FOR_FLAG_SET(chan_connected);
+	WAIT_FOR_FLAG(chan_connected);
 
-	WAIT_FOR_FLAG_SET(data_received);
+	WAIT_FOR_FLAG(data_received);
 
 	err = bt_conn_disconnect(default_conn, BT_HCI_ERR_REMOTE_USER_TERM_CONN);
 	if (err) {
-		FAIL("Failed to disconnect (err %d)\n", err);
+		TEST_FAIL("Failed to disconnect (err %d)", err);
 		return;
 	}
 
 	WAIT_FOR_FLAG_UNSET(is_connected);
 
-	PASS("Test passed\n");
+	TEST_PASS("Test passed");
 }
 
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "peripheral",
 		.test_descr = "Peripheral",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_peripheral_main,
 	},
 	{
 		.test_id = "central",
 		.test_descr = "Central",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_central_main,
 	},
 	BSTEST_END_MARKER,
diff --git a/tests/bsim/bluetooth/host/l2cap/stress/CMakeLists.txt b/tests/bsim/bluetooth/host/l2cap/stress/CMakeLists.txt
index 88c326dddf3..383f54c095c 100644
--- a/tests/bsim/bluetooth/host/l2cap/stress/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/l2cap/stress/CMakeLists.txt
@@ -5,6 +5,9 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_l2cap_stress)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 FILE(GLOB app_sources src/*.c)
 target_sources(app PRIVATE ${app_sources} )
 
diff --git a/tests/bsim/bluetooth/host/l2cap/stress/src/common.c b/tests/bsim/bluetooth/host/l2cap/stress/src/common.c
deleted file mode 100644
index 5b344c60571..00000000000
--- a/tests/bsim/bluetooth/host/l2cap/stress/src/common.c
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "common.h"
-
-extern enum bst_result_t bst_result;
-
-void test_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-	bst_result = In_progress;
-}
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i seconds)\n", WAIT_SECONDS);
-	}
-}
diff --git a/tests/bsim/bluetooth/host/l2cap/stress/src/common.h b/tests/bsim/bluetooth/host/l2cap/stress/src/common.h
deleted file mode 100644
index 88b7950899a..00000000000
--- a/tests/bsim/bluetooth/host/l2cap/stress/src/common.h
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Common functions and helpers for L2CAP tests
- *
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <stddef.h>
-
-#include <zephyr/types.h>
-#include <zephyr/sys/util.h>
-#include <zephyr/sys/byteorder.h>
-
-#include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/bluetooth/hci.h>
-#include <zephyr/bluetooth/l2cap.h>
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "bstests.h"
-#include "bs_pc_backchannel.h"
-
-extern enum bst_result_t bst_result;
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define UNSET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)false)
-#define TEST_FLAG(flag) (atomic_get(&flag) == (atomic_t)true)
-#define WAIT_FOR_FLAG_SET(flag)		   \
-	while (!(bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1));  \
-	}
-#define WAIT_FOR_FLAG_UNSET(flag)	  \
-	while ((bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-
-
-#define WAIT_SECONDS 400                        /* seconds */
-#define WAIT_TIME (WAIT_SECONDS * USEC_PER_SEC) /* microseconds*/
-
-#define FAIL(...)				       \
-	do {					       \
-		bst_result = Failed;		       \
-		bs_trace_error_time_line(__VA_ARGS__); \
-	} while (0)
-
-#define PASS(...)				    \
-	do {					    \
-		bst_result = Passed;		    \
-		bs_trace_info_time(1, __VA_ARGS__); \
-	} while (0)
-
-#define ASSERT(expr, ...) if (!(expr)) {FAIL(__VA_ARGS__); }
-
-void test_init(void);
-void test_tick(bs_time_t HW_device_time);
diff --git a/tests/bsim/bluetooth/host/l2cap/stress/src/main.c b/tests/bsim/bluetooth/host/l2cap/stress/src/main.c
index 0a9023ecbd3..e104fcfae81 100644
--- a/tests/bsim/bluetooth/host/l2cap/stress/src/main.c
+++ b/tests/bsim/bluetooth/host/l2cap/stress/src/main.c
@@ -6,15 +6,24 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include "bstests.h"
-#include "common.h"
+#include <stddef.h>
+
+#include <zephyr/types.h>
+#include <zephyr/sys/util.h>
+#include <zephyr/sys/byteorder.h>
+
+#include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/l2cap.h>
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 
 #define LOG_MODULE_NAME main
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(LOG_MODULE_NAME, LOG_LEVEL_INF);
 
-CREATE_FLAG(is_connected);
-CREATE_FLAG(flag_l2cap_connected);
+static DEFINE_FLAG(is_connected);
+static DEFINE_FLAG(flag_l2cap_connected);
 
 #define NUM_PERIPHERALS 6
 #define L2CAP_CHANS     NUM_PERIPHERALS
@@ -63,8 +72,7 @@ struct test_ctx *get_ctx(struct bt_l2cap_chan *chan)
 	struct bt_l2cap_le_chan *le_chan = CONTAINER_OF(chan, struct bt_l2cap_le_chan, chan);
 	struct test_ctx *ctx = CONTAINER_OF(le_chan, struct test_ctx, le_chan);
 
-	ASSERT(ctx >= &contexts[0] &&
-	       ctx <= &contexts[L2CAP_CHANS], "memory corruption");
+	TEST_ASSERT(ctx >= &contexts[0] && ctx <= &contexts[L2CAP_CHANS], "memory corruption");
 
 	return ctx;
 }
@@ -76,7 +84,7 @@ int l2cap_chan_send(struct bt_l2cap_chan *chan, uint8_t *data, size_t len)
 	struct net_buf *buf = net_buf_alloc(&sdu_tx_pool, K_NO_WAIT);
 
 	if (buf == NULL) {
-		FAIL("No more memory\n");
+		TEST_FAIL("No more memory");
 		return -ENOMEM;
 	}
 
@@ -93,7 +101,7 @@ int l2cap_chan_send(struct bt_l2cap_chan *chan, uint8_t *data, size_t len)
 		return ret;
 	}
 
-	ASSERT(ret >= 0, "Failed sending: err %d", ret);
+	TEST_ASSERT(ret >= 0, "Failed sending: err %d", ret);
 
 	LOG_DBG("sent %d len %d", ret, len);
 	return ret;
@@ -242,7 +250,7 @@ static int l2cap_server_register(bt_security_t sec_level)
 
 	int err = bt_l2cap_server_register(&test_l2cap_server);
 
-	ASSERT(err == 0, "Failed to register l2cap server.");
+	TEST_ASSERT(err == 0, "Failed to register l2cap server.");
 
 	return test_l2cap_server.psm;
 }
@@ -254,7 +262,7 @@ static void connected(struct bt_conn *conn, uint8_t conn_err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (conn_err) {
-		FAIL("Failed to connect to %s (%u)", addr, conn_err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, conn_err);
 		return;
 	}
 
@@ -287,7 +295,7 @@ static void disconnect_device(struct bt_conn *conn, void *data)
 	SET_FLAG(is_connected);
 
 	err = bt_conn_disconnect(conn, BT_HCI_ERR_REMOTE_USER_TERM_CONN);
-	ASSERT(!err, "Failed to initate disconnect (err %d)", err);
+	TEST_ASSERT(!err, "Failed to initate disconnect (err %d)", err);
 
 	LOG_DBG("Waiting for disconnection...");
 	WAIT_FOR_FLAG_UNSET(is_connected);
@@ -305,7 +313,7 @@ static void test_peripheral_main(void)
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Can't enable Bluetooth (err %d)", err);
+		TEST_FAIL("Can't enable Bluetooth (err %d)", err);
 		return;
 	}
 
@@ -313,13 +321,13 @@ static void test_peripheral_main(void)
 	LOG_DBG("Connectable advertising...");
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, NULL, 0, NULL, 0);
 	if (err) {
-		FAIL("Advertising failed to start (err %d)", err);
+		TEST_FAIL("Advertising failed to start (err %d)", err);
 		return;
 	}
 
 	LOG_DBG("Advertising started.");
 	LOG_DBG("Peripheral waiting for connection...");
-	WAIT_FOR_FLAG_SET(is_connected);
+	WAIT_FOR_FLAG(is_connected);
 	LOG_DBG("Peripheral Connected.");
 
 	int psm = l2cap_server_register(BT_SECURITY_L1);
@@ -335,9 +343,9 @@ static void test_peripheral_main(void)
 	WAIT_FOR_FLAG_UNSET(is_connected);
 	LOG_INF("Total received: %d", rx_cnt);
 
-	ASSERT(rx_cnt == SDU_NUM, "Did not receive expected no of SDUs\n");
+	TEST_ASSERT(rx_cnt == SDU_NUM, "Did not receive expected no of SDUs");
 
-	PASS("L2CAP STRESS Peripheral passed\n");
+	TEST_PASS("L2CAP STRESS Peripheral passed");
 }
 
 static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
@@ -349,7 +357,7 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 
 	err = bt_le_scan_stop();
 	if (err) {
-		FAIL("Stop LE scan failed (err %d)", err);
+		TEST_FAIL("Stop LE scan failed (err %d)", err);
 		return;
 	}
 
@@ -362,7 +370,7 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 	param = BT_LE_CONN_PARAM_DEFAULT;
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, param, &conn);
 	if (err) {
-		FAIL("Create conn failed (err %d)", err);
+		TEST_FAIL("Create conn failed (err %d)", err);
 		return;
 	}
 }
@@ -380,10 +388,10 @@ static void connect_peripheral(void)
 
 	int err = bt_le_scan_start(&scan_param, device_found);
 
-	ASSERT(!err, "Scanning failed to start (err %d)\n", err);
+	TEST_ASSERT(!err, "Scanning failed to start (err %d)", err);
 
 	LOG_DBG("Central initiating connection...");
-	WAIT_FOR_FLAG_SET(is_connected);
+	WAIT_FOR_FLAG(is_connected);
 }
 
 static void connect_l2cap_channel(struct bt_conn *conn, void *data)
@@ -391,7 +399,7 @@ static void connect_l2cap_channel(struct bt_conn *conn, void *data)
 	int err;
 	struct test_ctx *ctx = alloc_test_context();
 
-	ASSERT(ctx, "No more available test contexts\n");
+	TEST_ASSERT(ctx, "No more available test contexts");
 
 	struct bt_l2cap_le_chan *le_chan = &ctx->le_chan;
 
@@ -401,9 +409,9 @@ static void connect_l2cap_channel(struct bt_conn *conn, void *data)
 	UNSET_FLAG(flag_l2cap_connected);
 
 	err = bt_l2cap_chan_connect(conn, &le_chan->chan, 0x0080);
-	ASSERT(!err, "Error connecting l2cap channel (err %d)\n", err);
+	TEST_ASSERT(!err, "Error connecting l2cap channel (err %d)", err);
 
-	WAIT_FOR_FLAG_SET(flag_l2cap_connected);
+	WAIT_FOR_FLAG(flag_l2cap_connected);
 }
 
 static void test_central_main(void)
@@ -417,7 +425,7 @@ static void test_central_main(void)
 	}
 
 	err = bt_enable(NULL);
-	ASSERT(err == 0, "Can't enable Bluetooth (err %d)\n", err);
+	TEST_ASSERT(err == 0, "Can't enable Bluetooth (err %d)", err);
 	LOG_DBG("Central Bluetooth initialized.");
 
 	/* Connect all peripherals */
@@ -453,22 +461,18 @@ static void test_central_main(void)
 	}
 	LOG_DBG("All peripherals disconnected.");
 
-	PASS("L2CAP STRESS Central passed\n");
+	TEST_PASS("L2CAP STRESS Central passed");
 }
 
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "peripheral",
 		.test_descr = "Peripheral L2CAP STRESS",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_peripheral_main
 	},
 	{
 		.test_id = "central",
 		.test_descr = "Central L2CAP STRESS",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_central_main
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/l2cap/userdata/CMakeLists.txt b/tests/bsim/bluetooth/host/l2cap/userdata/CMakeLists.txt
index 298213989f5..2355ef86c05 100644
--- a/tests/bsim/bluetooth/host/l2cap/userdata/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/l2cap/userdata/CMakeLists.txt
@@ -5,6 +5,9 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_l2cap_userdata)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 FILE(GLOB app_sources src/*.c)
 target_sources(app PRIVATE ${app_sources} )
 
diff --git a/tests/bsim/bluetooth/host/l2cap/userdata/src/common.c b/tests/bsim/bluetooth/host/l2cap/userdata/src/common.c
deleted file mode 100644
index f725ac6129c..00000000000
--- a/tests/bsim/bluetooth/host/l2cap/userdata/src/common.c
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "common.h"
-
-extern enum bst_result_t bst_result;
-
-void test_init(void)
-{
-	bst_result = In_progress;
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-}
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i us)\n", WAIT_TIME);
-	}
-}
diff --git a/tests/bsim/bluetooth/host/l2cap/userdata/src/common.h b/tests/bsim/bluetooth/host/l2cap/userdata/src/common.h
deleted file mode 100644
index 3b0d09c53b6..00000000000
--- a/tests/bsim/bluetooth/host/l2cap/userdata/src/common.h
+++ /dev/null
@@ -1,44 +0,0 @@
-/*
- * Common functions and helpers for L2CAP tests
- *
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <stddef.h>
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "bstests.h"
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define UNSET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)false)
-#define WAIT_FOR_FLAG_SET(flag)		   \
-	while (!(bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1));  \
-	}
-#define WAIT_FOR_FLAG_UNSET(flag)	  \
-	while ((bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-
-
-#define WAIT_TIME (30e6) /* 30 seconds*/
-
-#define FAIL(...)				       \
-	do {					       \
-		bst_result = Failed;		       \
-		bs_trace_error_time_line(__VA_ARGS__); \
-	} while (0)
-
-#define PASS(...)				    \
-	do {					    \
-		bst_result = Passed;		    \
-		bs_trace_info_time(1, __VA_ARGS__); \
-	} while (0)
-
-
-void test_init(void);
-void test_tick(bs_time_t HW_device_time);
diff --git a/tests/bsim/bluetooth/host/l2cap/userdata/src/main_l2cap_userdata.c b/tests/bsim/bluetooth/host/l2cap/userdata/src/main_l2cap_userdata.c
index 57e70ae8821..e492036736f 100644
--- a/tests/bsim/bluetooth/host/l2cap/userdata/src/main_l2cap_userdata.c
+++ b/tests/bsim/bluetooth/host/l2cap/userdata/src/main_l2cap_userdata.c
@@ -4,11 +4,12 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include "common.h"
-
 #include <zephyr/bluetooth/bluetooth.h>
 #include <zephyr/bluetooth/l2cap.h>
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
+
 extern enum bst_result_t bst_result;
 
 static struct bt_conn *default_conn;
@@ -20,10 +21,10 @@ static struct bt_conn *default_conn;
 /* Pool to allocate a buffer that is too large to send */
 NET_BUF_POOL_DEFINE(buf_pool, 1, BT_L2CAP_SDU_BUF_SIZE(DATA_SIZE), USER_DATA_SIZE, NULL);
 
-CREATE_FLAG(is_connected);
-CREATE_FLAG(is_sent);
-CREATE_FLAG(has_received);
-CREATE_FLAG(chan_connected);
+static DEFINE_FLAG(is_connected);
+static DEFINE_FLAG(is_sent);
+static DEFINE_FLAG(has_received);
+static DEFINE_FLAG(chan_connected);
 
 static void chan_connected_cb(struct bt_l2cap_chan *l2cap_chan)
 {
@@ -96,7 +97,7 @@ static void connect_l2cap_channel(void)
 
 	err = bt_l2cap_ecred_chan_connect(default_conn, chans, server.psm);
 	if (err) {
-		FAIL("Failed to send ecred connection request (err %d)\n", err);
+		TEST_FAIL("Failed to send ecred connection request (err %d)", err);
 	}
 }
 
@@ -106,7 +107,7 @@ static void register_l2cap_server(void)
 
 	err = bt_l2cap_server_register(&server);
 	if (err < 0) {
-		FAIL("Failed to get free server (err %d)\n");
+		TEST_FAIL("Failed to get free server (err %d)");
 		return;
 	}
 }
@@ -114,7 +115,7 @@ static void register_l2cap_server(void)
 static void connected(struct bt_conn *conn, uint8_t err)
 {
 	if (err) {
-		FAIL("Failed to connect (err %d)\n", err);
+		TEST_FAIL("Failed to connect (err %d)", err);
 		bt_conn_unref(default_conn);
 		default_conn = NULL;
 		return;
@@ -128,7 +129,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 static void disconnected(struct bt_conn *conn, uint8_t reason)
 {
 	if (default_conn != conn) {
-		FAIL("Connection mismatch %p %p)\n", default_conn, conn);
+		TEST_FAIL("Connection mismatch %p %p)", default_conn, conn);
 		return;
 	}
 
@@ -150,14 +151,14 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 
 	err = bt_le_scan_stop();
 	if (err) {
-		FAIL("Failed to stop scanning (err %d)\n", err);
+		TEST_FAIL("Failed to stop scanning (err %d)", err);
 		return;
 	}
 
 	param = BT_LE_CONN_PARAM_DEFAULT;
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, param, &default_conn);
 	if (err) {
-		FAIL("Failed to create connection (err %d)\n", err);
+		TEST_FAIL("Failed to create connection (err %d)", err);
 		return;
 	}
 }
@@ -171,37 +172,37 @@ static void test_peripheral_main(void)
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 		return;
 	}
 
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, ad, ARRAY_SIZE(ad), NULL, 0);
 	if (err != 0) {
-		FAIL("Advertising failed to start (err %d)\n", err);
+		TEST_FAIL("Advertising failed to start (err %d)", err);
 		return;
 	}
 
-	WAIT_FOR_FLAG_SET(is_connected);
+	WAIT_FOR_FLAG(is_connected);
 
 	register_l2cap_server();
 
 	if (!IS_ENABLED(CONFIG_NO_RUNTIME_CHECKS)) {
-		PASS("Peripheral done\n");
+		TEST_PASS("Peripheral done");
 		return;
 	}
 
-	WAIT_FOR_FLAG_SET(has_received);
+	WAIT_FOR_FLAG(has_received);
 
 	/* /\* Wait until we get the credits *\/ */
 	/* k_sleep(K_MSEC(100)); */
 
 	err = bt_conn_disconnect(default_conn, BT_HCI_ERR_REMOTE_USER_TERM_CONN);
 	if (err) {
-		FAIL("Failed to disconnect (err %d)\n", err);
+		TEST_FAIL("Failed to disconnect (err %d)", err);
 		return;
 	}
 
-	PASS("Test passed\n");
+	TEST_PASS("Test passed");
 }
 
 #define FILL	       0xAA
@@ -226,22 +227,22 @@ static void test_central_main(void)
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth discover failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth discover failed (err %d)", err);
 	}
 
 	err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
 	if (err != 0) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 	}
 
-	WAIT_FOR_FLAG_SET(is_connected);
+	WAIT_FOR_FLAG(is_connected);
 
 	connect_l2cap_channel();
-	WAIT_FOR_FLAG_SET(chan_connected);
+	WAIT_FOR_FLAG(chan_connected);
 
 	buf = net_buf_alloc(&buf_pool, K_NO_WAIT);
 	if (!buf) {
-		FAIL("Buffer allcation failed\n");
+		TEST_FAIL("Buffer allcation failed");
 	}
 
 	net_buf_reserve(buf, BT_L2CAP_SDU_CHAN_SEND_RESERVE);
@@ -264,10 +265,10 @@ static void test_central_main(void)
 	 */
 
 	if (err != 0) {
-		FAIL("Got error %d\n", err);
+		TEST_FAIL("Got error %d", err);
 	}
 
-	WAIT_FOR_FLAG_SET(is_sent);
+	WAIT_FOR_FLAG(is_sent);
 
 	printk("Buffer user_data after (should've been cleared)\n");
 	print_user_data(buf);
@@ -277,26 +278,22 @@ static void test_central_main(void)
 	/* Validate that the user data has changed */
 	for (int i = 0; i < USER_DATA_SIZE; i++) {
 		if (buf->user_data[i] == FILL) {
-			FAIL("Buffer user data should be reset by stack.\n");
+			TEST_FAIL("Buffer user data should be reset by stack.");
 		}
 	}
 
-	PASS("(Disabled-checks) Test passed\n");
+	TEST_PASS("(Disabled-checks) Test passed");
 }
 
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "peripheral",
 		.test_descr = "Peripheral",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_peripheral_main,
 	},
 	{
 		.test_id = "central",
 		.test_descr = "Central",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_central_main,
 	},
 	BSTEST_END_MARKER,
diff --git a/tests/bsim/bluetooth/host/misc/conn_stress/central/src/main.c b/tests/bsim/bluetooth/host/misc/conn_stress/central/src/main.c
index 9b8a38e8cb6..7ce3dbfe489 100644
--- a/tests/bsim/bluetooth/host/misc/conn_stress/central/src/main.c
+++ b/tests/bsim/bluetooth/host/misc/conn_stress/central/src/main.c
@@ -720,7 +720,7 @@ static void test_args(int argc, char **argv)
 		ptr = strstr(argv[0], "notify_size=");
 		if (ptr != NULL) {
 			ptr += strlen("notify_size=");
-			notification_size = atol(ptr);
+			notification_size = strtol(ptr, NULL, 10);
 			notification_size = MIN(NOTIFICATION_DATA_LEN, notification_size);
 		}
 	}
@@ -731,7 +731,7 @@ static void test_args(int argc, char **argv)
 		ptr = strstr(argv[1], "conn_interval=");
 		if (ptr != NULL) {
 			ptr += strlen("conn_interval=");
-			conn_interval_max = atol(ptr);
+			conn_interval_max = strtol(ptr, NULL, 10);
 		}
 	}
 
diff --git a/tests/bsim/bluetooth/host/misc/conn_stress/peripheral/src/main.c b/tests/bsim/bluetooth/host/misc/conn_stress/peripheral/src/main.c
index be11ade9baf..b46d52b60d7 100644
--- a/tests/bsim/bluetooth/host/misc/conn_stress/peripheral/src/main.c
+++ b/tests/bsim/bluetooth/host/misc/conn_stress/peripheral/src/main.c
@@ -473,7 +473,7 @@ static void test_args(int argc, char **argv)
 		ptr = strstr(argv[0], "notify_size=");
 		if (ptr != NULL) {
 			ptr += strlen("notify_size=");
-			notification_size = atol(ptr);
+			notification_size = strtol(ptr, NULL, 10);
 			notification_size = MIN(NOTIFICATION_DATA_LEN, notification_size);
 		}
 	}
diff --git a/tests/bsim/bluetooth/host/misc/disable/CMakeLists.txt b/tests/bsim/bluetooth/host/misc/disable/CMakeLists.txt
index af4a62820e7..199232976e1 100644
--- a/tests/bsim/bluetooth/host/misc/disable/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/misc/disable/CMakeLists.txt
@@ -14,6 +14,8 @@ zephyr_include_directories(
   )
 
 add_subdirectory(${ZEPHYR_BASE}/tests/bluetooth/common/testlib testlib)
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
 target_link_libraries(app PRIVATE
   testlib
+  babblekit
 )
diff --git a/tests/bsim/bluetooth/host/misc/disable/src/common.c b/tests/bsim/bluetooth/host/misc/disable/src/common.c
deleted file mode 100644
index df438607c5f..00000000000
--- a/tests/bsim/bluetooth/host/misc/disable/src/common.c
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "common.h"
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i seconds)\n", WAIT_TIME);
-	}
-}
-
-void test_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-	bst_result = In_progress;
-}
diff --git a/tests/bsim/bluetooth/host/misc/disable/src/common.h b/tests/bsim/bluetooth/host/misc/disable/src/common.h
index cb93d7ff71a..46c3dc38232 100644
--- a/tests/bsim/bluetooth/host/misc/disable/src/common.h
+++ b/tests/bsim/bluetooth/host/misc/disable/src/common.h
@@ -6,51 +6,6 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <zephyr/kernel.h>
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "time_machine.h"
-#include "bstests.h"
-
-#include <zephyr/types.h>
-#include <stddef.h>
-#include <errno.h>
-
-#include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/bluetooth/hci.h>
-#include <zephyr/bluetooth/conn.h>
-#include <zephyr/bluetooth/uuid.h>
-#include <zephyr/bluetooth/gatt.h>
-
-extern enum bst_result_t bst_result;
-
-#define WAIT_TIME (600 * 1e6) /*seconds*/
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t)false
-#define SET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)true)
-#define UNSET_FLAG(flag) (void)atomic_set(&flag, (atomic_t)false)
-#define WAIT_FOR_FLAG(flag) \
-	while (!(bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-#define WAIT_FOR_FLAG_UNSET(flag) \
-	while ((bool)atomic_get(&flag)) { \
-		(void)k_sleep(K_MSEC(1)); \
-	}
-
-#define FAIL(...) \
-	do { \
-		bst_result = Failed; \
-		bs_trace_error_time_line(__VA_ARGS__); \
-	} while (0)
-
-#define PASS(...) \
-	do { \
-		bst_result = Passed; \
-		bs_trace_info_time(1, __VA_ARGS__); \
-	} while (0)
-
 #define CHRC_SIZE 10
 #define LONG_CHRC_SIZE 40
 
@@ -65,6 +20,3 @@ extern enum bst_result_t bst_result;
 #define TEST_LONG_CHRC_UUID \
 	BT_UUID_DECLARE_128(0x01, 0x23, 0x45, 0x67, 0x89, 0x01, 0x02, 0x03, \
 			    0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0xFF, 0x11)
-
-void test_tick(bs_time_t HW_device_time);
-void test_init(void);
diff --git a/tests/bsim/bluetooth/host/misc/disable/src/gatt_client_test.c b/tests/bsim/bluetooth/host/misc/disable/src/gatt_client_test.c
index 1c7df533bbd..4d53d60a7ec 100644
--- a/tests/bsim/bluetooth/host/misc/disable/src/gatt_client_test.c
+++ b/tests/bsim/bluetooth/host/misc/disable/src/gatt_client_test.c
@@ -4,15 +4,24 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <stddef.h>
+#include <errno.h>
+#include <zephyr/kernel.h>
+#include <zephyr/types.h>
 #include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/uuid.h>
 #include <zephyr/bluetooth/gatt.h>
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 
-CREATE_FLAG(flag_is_connected);
-CREATE_FLAG(flag_discover_complete);
-CREATE_FLAG(flag_write_complete);
-CREATE_FLAG(flag_read_complete);
+static DEFINE_FLAG(flag_is_connected);
+static DEFINE_FLAG(flag_discover_complete);
+static DEFINE_FLAG(flag_write_complete);
+static DEFINE_FLAG(flag_read_complete);
 
 static struct bt_conn *g_conn;
 static uint16_t chrc_handle;
@@ -32,7 +41,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != 0) {
-		FAIL("Failed to connect to %s (%u)\n", addr, err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, err);
 		return;
 	}
 
@@ -86,14 +95,14 @@ void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 	printk("Stopping scan\n");
 	err = bt_le_scan_stop();
 	if (err != 0) {
-		FAIL("Could not stop scan: %d");
+		TEST_FAIL("Could not stop scan: %d");
 		return;
 	}
 
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN,
 				BT_LE_CONN_PARAM_DEFAULT, &g_conn);
 	if (err != 0) {
-		FAIL("Could not connect to peer: %d", err);
+		TEST_FAIL("Could not connect to peer: %d", err);
 	}
 }
 
@@ -105,8 +114,8 @@ static uint8_t discover_func(struct bt_conn *conn,
 
 	if (attr == NULL) {
 		if (chrc_handle == 0 || long_chrc_handle == 0) {
-			FAIL("Did not discover chrc (%x) or long_chrc (%x)",
-			     chrc_handle, long_chrc_handle);
+			TEST_FAIL("Did not discover chrc (%x) or long_chrc (%x)", chrc_handle,
+				  long_chrc_handle);
 		}
 
 		(void)memset(params, 0, sizeof(*params));
@@ -127,7 +136,7 @@ static uint8_t discover_func(struct bt_conn *conn,
 
 		err = bt_gatt_discover(conn, params);
 		if (err != 0) {
-			FAIL("Discover failed (err %d)\n", err);
+			TEST_FAIL("Discover failed (err %d)", err);
 		}
 
 		return BT_GATT_ITER_STOP;
@@ -161,7 +170,7 @@ static void gatt_discover(void)
 
 	err = bt_gatt_discover(g_conn, &discover_params);
 	if (err != 0) {
-		FAIL("Discover failed(err %d)\n", err);
+		TEST_FAIL("Discover failed(err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(flag_discover_complete);
@@ -172,7 +181,7 @@ static void gatt_write_cb(struct bt_conn *conn, uint8_t err,
 			  struct bt_gatt_write_params *params)
 {
 	if (err != BT_ATT_ERR_SUCCESS) {
-		FAIL("Write failed: 0x%02X\n", err);
+		TEST_FAIL("Write failed: 0x%02X\n", err);
 	}
 
 	(void)memset(params, 0, sizeof(*params));
@@ -202,7 +211,7 @@ static void gatt_write(uint16_t handle)
 
 	err = bt_gatt_write(g_conn, &write_params);
 	if (err != 0) {
-		FAIL("bt_gatt_write failed: %d\n", err);
+		TEST_FAIL("bt_gatt_write failed: %d", err);
 	}
 
 	WAIT_FOR_FLAG(flag_write_complete);
@@ -214,18 +223,16 @@ static uint8_t gatt_read_cb(struct bt_conn *conn, uint8_t err,
 			    const void *data, uint16_t length)
 {
 	if (err != BT_ATT_ERR_SUCCESS) {
-		FAIL("Read failed: 0x%02X\n", err);
+		TEST_FAIL("Read failed: 0x%02X\n", err);
 	}
 
 	if (params->single.handle == chrc_handle) {
-		if (length != CHRC_SIZE ||
-		    memcmp(data, chrc_data, length) != 0) {
-			FAIL("chrc data different than expected", err);
+		if (length != CHRC_SIZE || memcmp(data, chrc_data, length) != 0) {
+			TEST_FAIL("chrc data different than expected", err);
 		}
 	} else if (params->single.handle == chrc_handle) {
-		if (length != LONG_CHRC_SIZE ||
-		    memcmp(data, long_chrc_data, length) != 0) {
-			FAIL("long_chrc data different than expected", err);
+		if (length != LONG_CHRC_SIZE || memcmp(data, long_chrc_data, length) != 0) {
+			TEST_FAIL("long_chrc data different than expected", err);
 		}
 	}
 
@@ -252,7 +259,7 @@ static void gatt_read(uint16_t handle)
 
 	err = bt_gatt_read(g_conn, &read_params);
 	if (err != 0) {
-		FAIL("bt_gatt_read failed: %d\n", err);
+		TEST_FAIL("bt_gatt_read failed: %d", err);
 	}
 
 	WAIT_FOR_FLAG(flag_read_complete);
@@ -269,13 +276,13 @@ static void test_main(void)
 
 		err = bt_enable(NULL);
 		if (err != 0) {
-			FAIL("Bluetooth discover failed (err %d)\n", err);
+			TEST_FAIL("Bluetooth discover failed (err %d)", err);
 		}
 		printk("Bluetooth initialized\n");
 
 		err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
 		if (err != 0) {
-			FAIL("Scanning failed to start (err %d)\n", err);
+			TEST_FAIL("Scanning failed to start (err %d)", err);
 		}
 
 		printk("Scanning successfully started\n");
@@ -294,7 +301,7 @@ static void test_main(void)
 
 		err = bt_conn_disconnect(g_conn, 0x13);
 		if (err != 0) {
-			FAIL("Disconnect failed (err %d)\n", err);
+			TEST_FAIL("Disconnect failed (err %d)", err);
 			return;
 		}
 
@@ -302,19 +309,17 @@ static void test_main(void)
 
 		err = bt_disable();
 		if (err != 0) {
-			FAIL("Bluetooth disable failed (err %d)\n", err);
+			TEST_FAIL("Bluetooth disable failed (err %d)", err);
 		}
 		printk("Bluetooth successfully disabled\n");
 	}
 
-	PASS("GATT client Passed\n");
+	TEST_PASS("GATT client Passed\n");
 }
 
 static const struct bst_test_instance test_vcs[] = {
 	{
 		.test_id = "gatt_client",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/misc/disable/src/gatt_server_test.c b/tests/bsim/bluetooth/host/misc/disable/src/gatt_server_test.c
index 78cee69024d..613f76d5c22 100644
--- a/tests/bsim/bluetooth/host/misc/disable/src/gatt_server_test.c
+++ b/tests/bsim/bluetooth/host/misc/disable/src/gatt_server_test.c
@@ -4,11 +4,23 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <stddef.h>
+#include <errno.h>
+#include <zephyr/kernel.h>
+#include <zephyr/types.h>
+#include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/conn.h>
+#include <zephyr/bluetooth/uuid.h>
+#include <zephyr/bluetooth/gatt.h>
+
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 
 extern enum bst_result_t bst_result;
 
-CREATE_FLAG(flag_is_connected);
+static DEFINE_FLAG(flag_is_connected);
 
 #define NUM_ITERATIONS 10
 
@@ -19,7 +31,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != 0) {
-		FAIL("Failed to connect to %s (%u)\n", addr, err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, err);
 		return;
 	}
 
@@ -71,7 +83,7 @@ static ssize_t write_test_chrc(struct bt_conn *conn,
 	}
 
 	if (flags != 0) {
-		FAIL("Invalid flags %u\n", flags);
+		TEST_FAIL("Invalid flags %u", flags);
 		return BT_GATT_ERR(BT_ATT_ERR_UNLIKELY);
 	}
 
@@ -138,7 +150,7 @@ static void test_main(void)
 	for (int i = 0; i < NUM_ITERATIONS; i++) {
 		err = bt_enable(NULL);
 		if (err != 0) {
-			FAIL("Bluetooth init failed (err %d)\n", err);
+			TEST_FAIL("Bluetooth init failed (err %d)", err);
 			return;
 		}
 
@@ -146,7 +158,7 @@ static void test_main(void)
 
 		err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, ad, ARRAY_SIZE(ad), NULL, 0);
 		if (err != 0) {
-			FAIL("Advertising failed to start (err %d)\n", err);
+			TEST_FAIL("Advertising failed to start (err %d)", err);
 			return;
 		}
 
@@ -158,21 +170,19 @@ static void test_main(void)
 
 		err = bt_disable();
 		if (err != 0) {
-			FAIL("Bluetooth disable failed (err %d)\n", err);
+			TEST_FAIL("Bluetooth disable failed (err %d)", err);
 			return;
 		}
 
 		printk("Bluetooth disabled\n");
 	}
 
-	PASS("GATT server passed\n");
+	TEST_PASS("GATT server passed");
 }
 
 static const struct bst_test_instance test_gatt_server[] = {
 	{
 		.test_id = "gatt_server",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_main
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/misc/disable/src/main_disable.c b/tests/bsim/bluetooth/host/misc/disable/src/main_disable.c
index f7f2c3c495a..e100e50456d 100644
--- a/tests/bsim/bluetooth/host/misc/disable/src/main_disable.c
+++ b/tests/bsim/bluetooth/host/misc/disable/src/main_disable.c
@@ -6,10 +6,14 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <zephyr/bluetooth/bluetooth.h>
+
 #define LOG_MODULE_NAME main_disable
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(LOG_MODULE_NAME, LOG_LEVEL_DBG);
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 
 extern enum bst_result_t bst_result;
@@ -23,16 +27,16 @@ static void test_disable_main(void)
 
 		err = bt_enable(NULL);
 		if (err != 0) {
-			FAIL("Enable failed (err %d)\n", err);
+			TEST_FAIL("Enable failed (err %d)", err);
 		}
 
 		err = bt_disable();
 		if (err) {
-			FAIL("Enable failed (err %d)\n", err);
+			TEST_FAIL("Enable failed (err %d)", err);
 		}
 	}
 
-	PASS("Disable test passed\n");
+	TEST_PASS("Disable test passed");
 }
 
 static void test_disable_set_default_id(void)
@@ -53,23 +57,23 @@ static void test_disable_set_default_id(void)
 
 		err = bt_id_create(&addr, NULL);
 		if (err != 0) {
-			FAIL("Creating ID failed (err %d)\n", err);
+			TEST_FAIL("Creating ID failed (err %d)", err);
 		}
 
 		err = bt_enable(NULL);
 		if (err != 0) {
-			FAIL("Enable failed (err %d)\n", err);
+			TEST_FAIL("Enable failed (err %d)", err);
 		}
 
 		bt_id_get(NULL, &id_count);
 		if (id_count != 1) {
-			FAIL("Expected only one ID, but got: %u\n", id_count);
+			TEST_FAIL("Expected only one ID, but got: %u", id_count);
 		}
 
 		id_count = 1;
 		bt_id_get(&stored_id, &id_count);
 		if (id_count != 1) {
-			FAIL("Expected only one ID, but got: %u\n", id_count);
+			TEST_FAIL("Expected only one ID, but got: %u", id_count);
 		}
 
 		if (!bt_addr_le_eq(&stored_id, &addr)) {
@@ -78,32 +82,28 @@ static void test_disable_set_default_id(void)
 
 			bt_addr_le_to_str(&addr, addr_set_str, BT_ADDR_LE_STR_LEN);
 			bt_addr_le_to_str(&stored_id, addr_stored_str, BT_ADDR_LE_STR_LEN);
-			FAIL("Expected stored ID to be equal to set ID: %s, %s\n",
-			     addr_set_str, addr_stored_str);
+			TEST_FAIL("Expected stored ID to be equal to set ID: %s, %s", addr_set_str,
+				  addr_stored_str);
 		}
 
 		err = bt_disable();
 		if (err) {
-			FAIL("Enable failed (err %d)\n", err);
+			TEST_FAIL("Enable failed (err %d)", err);
 		}
 	}
 
-	PASS("Disable set default ID test passed\n");
+	TEST_PASS("Disable set default ID test passed");
 }
 
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "disable",
 		.test_descr = "disable_test",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_disable_main
 	},
 	{
 		.test_id = "disable_set_default_id",
 		.test_descr = "disable_test where each iteration sets the default ID",
-		.test_pre_init_f = test_init,
-		.test_tick_f = test_tick,
 		.test_main_f = test_disable_set_default_id
 	},
 	BSTEST_END_MARKER
diff --git a/tests/bsim/bluetooth/host/misc/unregister_conn_cb/CMakeLists.txt b/tests/bsim/bluetooth/host/misc/unregister_conn_cb/CMakeLists.txt
index 81042fb740b..57928c2eb04 100644
--- a/tests/bsim/bluetooth/host/misc/unregister_conn_cb/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/misc/unregister_conn_cb/CMakeLists.txt
@@ -5,6 +5,9 @@ cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_unregister_conn_cb)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 FILE(GLOB app_sources src/*.c)
 target_sources(app PRIVATE ${app_sources} )
 
diff --git a/tests/bsim/bluetooth/host/misc/unregister_conn_cb/src/common.c b/tests/bsim/bluetooth/host/misc/unregister_conn_cb/src/common.c
deleted file mode 100644
index df438607c5f..00000000000
--- a/tests/bsim/bluetooth/host/misc/unregister_conn_cb/src/common.c
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include "common.h"
-
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		FAIL("test failed (not passed after %i seconds)\n", WAIT_TIME);
-	}
-}
-
-void test_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-	bst_result = In_progress;
-}
diff --git a/tests/bsim/bluetooth/host/misc/unregister_conn_cb/src/common.h b/tests/bsim/bluetooth/host/misc/unregister_conn_cb/src/common.h
deleted file mode 100644
index 159f27a8a21..00000000000
--- a/tests/bsim/bluetooth/host/misc/unregister_conn_cb/src/common.h
+++ /dev/null
@@ -1,55 +0,0 @@
-/**
- * Common functions and helpers for unregister connection callback tests
- *
- * Copyright (c) 2024 NXP
- * Copyright (c) 2022 Nordic Semiconductor ASA
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#include <zephyr/kernel.h>
-
-#include "bs_types.h"
-#include "bs_tracing.h"
-#include "time_machine.h"
-#include "bstests.h"
-
-#include <zephyr/types.h>
-#include <stddef.h>
-#include <errno.h>
-
-#include <zephyr/bluetooth/bluetooth.h>
-#include <zephyr/bluetooth/hci.h>
-#include <zephyr/bluetooth/conn.h>
-
-extern enum bst_result_t bst_result;
-
-#define WAIT_SECONDS (30) /*seconds*/
-#define WAIT_TIME (WAIT_SECONDS * USEC_PER_SEC) /*microseconds*/
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t) false
-#define SET_FLAG(flag)    (void)atomic_set(&flag, (atomic_t) true)
-#define UNSET_FLAG(flag)  (void)atomic_set(&flag, (atomic_t) false)
-#define WAIT_FOR_FLAG(flag)                                                                        \
-	while (!(bool)atomic_get(&flag)) {                                                         \
-		(void)k_sleep(K_MSEC(1));                                                          \
-	}
-#define WAIT_FOR_FLAG_UNSET(flag)                                                                  \
-	while ((bool)atomic_get(&flag)) {                                                          \
-		(void)k_sleep(K_MSEC(1));                                                          \
-	}
-
-#define FAIL(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Failed;                                                               \
-		bs_trace_error_time_line(__VA_ARGS__);                                             \
-	} while (0)
-
-#define PASS(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Passed;                                                               \
-		bs_trace_info_time(1, __VA_ARGS__);                                                \
-	} while (0)
-
-void test_tick(bs_time_t HW_device_time);
-void test_init(void);
diff --git a/tests/bsim/bluetooth/host/misc/unregister_conn_cb/src/main.c b/tests/bsim/bluetooth/host/misc/unregister_conn_cb/src/main.c
index ac2d919afab..a2c6cd87ce4 100644
--- a/tests/bsim/bluetooth/host/misc/unregister_conn_cb/src/main.c
+++ b/tests/bsim/bluetooth/host/misc/unregister_conn_cb/src/main.c
@@ -7,14 +7,19 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include "bstests.h"
+#include <stddef.h>
+#include <errno.h>
+#include <zephyr/kernel.h>
+#include <zephyr/types.h>
 #include <zephyr/bluetooth/bluetooth.h>
+#include <zephyr/bluetooth/hci.h>
+#include <zephyr/bluetooth/conn.h>
 
 #include <testlib/conn.h>
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 
-#include "common.h"
-
-CREATE_FLAG(flag_is_connected);
+static DEFINE_FLAG(flag_is_connected);
 
 static struct bt_conn *g_conn;
 
@@ -25,7 +30,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
 
 	if (err != 0) {
-		FAIL("Failed to connect to %s (%u)\n", addr, err);
+		TEST_FAIL("Failed to connect to %s (%u)", addr, err);
 		return;
 	}
 
@@ -82,13 +87,13 @@ void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type, struct ne
 	printk("Stopping scan\n");
 	err = bt_le_scan_stop();
 	if (err != 0) {
-		FAIL("Could not stop scan: %d");
+		TEST_FAIL("Could not stop scan: %d");
 		return;
 	}
 
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, BT_LE_CONN_PARAM_DEFAULT, &conn);
 	if (err != 0) {
-		FAIL("Could not connect to peer: %d", err);
+		TEST_FAIL("Could not connect to peer: %d", err);
 	}
 	printk("%s: connected to found device\n", __func__);
 
@@ -125,7 +130,7 @@ static void start_adv(void)
 
 	err = bt_le_adv_start(BT_LE_ADV_CONN_FAST_1, ad, ARRAY_SIZE(ad), NULL, 0);
 	if (err != 0) {
-		FAIL("Advertising failed to start (err %d)\n", err);
+		TEST_FAIL("Advertising failed to start (err %d)", err);
 		return;
 	}
 
@@ -138,7 +143,7 @@ static void test_peripheral_main(void)
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 		return;
 	}
 
@@ -161,13 +166,13 @@ static void test_peripheral_main(void)
 
 	err = bt_disable();
 	if (err != 0) {
-		FAIL("Bluetooth disable failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth disable failed (err %d)", err);
 		return;
 	}
 
 	printk("Bluetooth successfully disabled\n");
 
-	PASS("Peripheral device passed\n");
+	TEST_PASS("Peripheral device passed");
 }
 
 static void test_central_main(void)
@@ -177,14 +182,14 @@ static void test_central_main(void)
 
 	err = bt_enable(NULL);
 	if (err != 0) {
-		FAIL("Bluetooth discover failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth discover failed (err %d)", err);
 	}
 	printk("Bluetooth initialized\n");
 	bt_conn_cb_register(&conn_callbacks);
 	/* Connect to peer device after conn_callbacks registered*/
 	err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
 	if (err != 0) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 	}
 
 	printk("Scanning successfully started\n");
@@ -194,7 +199,7 @@ static void test_central_main(void)
 	err = bt_conn_disconnect(g_conn, 0x13);
 
 	if (err != 0) {
-		FAIL("Disconnect failed (err %d)\n", err);
+		TEST_FAIL("Disconnect failed (err %d)", err);
 		return;
 	}
 
@@ -203,40 +208,36 @@ static void test_central_main(void)
 	/* Reconnect to the device after conn_callbacks unregistered */
 	err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
 	if (err != 0) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 	}
 	printk("Scanning successfully started\n");
 
 	k_sleep(K_SECONDS(1));
 	bt_conn_foreach(BT_CONN_TYPE_LE, connection_info, &conn_count);
 	if (!conn_count) {
-		FAIL("Reconnect to peer device failed!");
+		TEST_FAIL("Reconnect to peer device failed!");
 	}
 
 	/* flag_is_connected not set means no conn_callbacks being called */
 	if (flag_is_connected) {
-		FAIL("Unregister conn_callback didn't work");
+		TEST_FAIL("Unregister conn_callback didn't work");
 	}
 	printk("Unregister connection callbacks succeed!\n");
 
 	err = bt_disable();
 	if (err != 0) {
-		FAIL("Bluetooth disable failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth disable failed (err %d)", err);
 	}
 	printk("Bluetooth successfully disabled\n");
 
-	PASS("Central device passed\n");
+	TEST_PASS("Central device passed");
 }
 
 static const struct bst_test_instance test_def[] = {{.test_id = "peripheral",
 						     .test_descr = "Peripheral device",
-						     .test_pre_init_f = test_init,
-						     .test_tick_f = test_tick,
 						     .test_main_f = test_peripheral_main},
 						    {.test_id = "central",
 						     .test_descr = "Central device",
-						     .test_pre_init_f = test_init,
-						     .test_tick_f = test_tick,
 						     .test_main_f = test_central_main},
 						    BSTEST_END_MARKER};
 
diff --git a/tests/bsim/bluetooth/host/security/ccc_update/CMakeLists.txt b/tests/bsim/bluetooth/host/security/ccc_update/CMakeLists.txt
index fb2b3228ecc..be4416ced57 100644
--- a/tests/bsim/bluetooth/host/security/ccc_update/CMakeLists.txt
+++ b/tests/bsim/bluetooth/host/security/ccc_update/CMakeLists.txt
@@ -12,6 +12,9 @@ endif()
 find_package(Zephyr HINTS $ENV{ZEPHYR_BASE})
 project(bsim_test_ccc_update)
 
+add_subdirectory(${ZEPHYR_BASE}/tests/bsim/babblekit babblekit)
+target_link_libraries(app PRIVATE babblekit)
+
 target_sources(app PRIVATE
   src/main.c
   src/common.c
diff --git a/tests/bsim/bluetooth/host/security/ccc_update/src/central.c b/tests/bsim/bluetooth/host/security/ccc_update/src/central.c
index 8f2d2c17dd4..40adf5efb29 100644
--- a/tests/bsim/bluetooth/host/security/ccc_update/src/central.c
+++ b/tests/bsim/bluetooth/host/security/ccc_update/src/central.c
@@ -18,6 +18,8 @@
 
 #include <zephyr/settings/settings.h>
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 #include "settings.h"
 
@@ -27,9 +29,9 @@
 #define CLIENT_CLIENT_CHAN 0
 #define SERVER_CLIENT_CHAN 1
 
-CREATE_FLAG(connected_flag);
-CREATE_FLAG(disconnected_flag);
-CREATE_FLAG(security_updated_flag);
+static DEFINE_FLAG(connected_flag);
+static DEFINE_FLAG(disconnected_flag);
+static DEFINE_FLAG(security_updated_flag);
 
 #define BT_UUID_DUMMY_SERVICE BT_UUID_DECLARE_128(DUMMY_SERVICE_TYPE)
 #define BT_UUID_DUMMY_SERVICE_NOTIFY BT_UUID_DECLARE_128(DUMMY_SERVICE_NOTIFY_TYPE)
@@ -38,7 +40,7 @@ static struct bt_conn *default_conn;
 
 static struct bt_conn_cb central_cb;
 
-CREATE_FLAG(gatt_write_flag);
+static DEFINE_FLAG(gatt_write_flag);
 static uint8_t gatt_write_att_err;
 
 static void gatt_write_cb(struct bt_conn *conn, uint8_t att_err,
@@ -47,7 +49,7 @@ static void gatt_write_cb(struct bt_conn *conn, uint8_t att_err,
 	gatt_write_att_err = att_err;
 
 	if (att_err) {
-		FAIL("GATT write ATT error (err %d)\n", att_err);
+		TEST_FAIL("GATT write ATT error (err %d)", att_err);
 	}
 
 	SET_FLAG(gatt_write_flag);
@@ -72,7 +74,7 @@ static int gatt_write(struct bt_conn *conn, uint16_t handle, const uint8_t *writ
 	 */
 	err = bt_gatt_write(conn, &params);
 	if (err) {
-		FAIL("GATT write failed (err %d)", err);
+		TEST_FAIL("GATT write failed (err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(gatt_write_flag);
@@ -87,7 +89,7 @@ static void ccc_subscribe(void)
 
 	err = gatt_write(default_conn, CCC_HANDLE, &buf, sizeof(buf));
 	if (err) {
-		FAIL("Failed to subscribe (att err %d)", err);
+		TEST_FAIL("Failed to subscribe (att err %d)", err);
 	}
 }
 
@@ -98,7 +100,7 @@ static void ccc_unsubscribe(void)
 
 	err = gatt_write(default_conn, CCC_HANDLE, &buf, sizeof(buf));
 	if (err) {
-		FAIL("Failed to unsubscribe (att err %d)", err);
+		TEST_FAIL("Failed to unsubscribe (att err %d)", err);
 	}
 }
 
@@ -114,13 +116,13 @@ static void device_found(const bt_addr_le_t *addr, int8_t rssi, uint8_t type,
 
 	err = bt_le_scan_stop();
 	if (err) {
-		FAIL("Failed to stop scanner (err %d)\n", err);
+		TEST_FAIL("Failed to stop scanner (err %d)", err);
 	}
 
 	err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, BT_LE_CONN_PARAM_DEFAULT,
 				&default_conn);
 	if (err) {
-		FAIL("Could not connect to peer: %s (err %d)\n", addr_str, err);
+		TEST_FAIL("Could not connect to peer: %s (err %d)", addr_str, err);
 	}
 }
 
@@ -133,7 +135,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(addr, addr_str, sizeof(addr_str));
 
 	if (err) {
-		FAIL("Failed to connect to %s (err %d)\n", addr_str, err);
+		TEST_FAIL("Failed to connect to %s (err %d)", addr_str, err);
 	}
 
 	LOG_DBG("Connected: %s", addr_str);
@@ -181,7 +183,7 @@ static void start_scan(void)
 
 	err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found);
 	if (err) {
-		FAIL("Scanning failed to start (err %d)\n", err);
+		TEST_FAIL("Scanning failed to start (err %d)", err);
 	}
 
 	LOG_DBG("Scanning successfully started");
@@ -193,7 +195,7 @@ static void disconnect(void)
 
 	err = bt_conn_disconnect(default_conn, BT_HCI_ERR_REMOTE_USER_TERM_CONN);
 	if (err) {
-		FAIL("Disconnection failed (err %d)\n", err);
+		TEST_FAIL("Disconnection failed (err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(disconnected_flag);
@@ -213,7 +215,7 @@ static void connect_pair_subscribe(void)
 
 	err = bt_conn_set_security(default_conn, BT_SECURITY_L2);
 	if (err != 0) {
-		FAIL("Failed to set security (err %d)\n", err);
+		TEST_FAIL("Failed to set security (err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(security_updated_flag);
@@ -259,7 +261,7 @@ static void connect_restore_sec(void)
 
 	err = bt_conn_set_security(default_conn, BT_SECURITY_L2);
 	if (err != 0) {
-		FAIL("Failed to set security (err %d)\n", err);
+		TEST_FAIL("Failed to set security (err %d)", err);
 	}
 
 	WAIT_FOR_FLAG(security_updated_flag);
@@ -293,7 +295,7 @@ void central_backchannel_init(void)
 	LOG_DBG("Opening back channels for device %d", device_number);
 	ch = bs_open_back_channel(device_number, device_numbers, channel_numbers, num_ch);
 	if (!ch) {
-		FAIL("Unable to open backchannel\n");
+		TEST_FAIL("Unable to open backchannel");
 	}
 	LOG_DBG("Back channels for device %d opened", device_number);
 }
@@ -320,7 +322,7 @@ void run_central(void)
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 	}
 
 	LOG_DBG("Bluetooth initialized");
@@ -329,12 +331,12 @@ void run_central(void)
 
 	err = settings_load();
 	if (err) {
-		FAIL("Settings load failed (err %d)\n", err);
+		TEST_FAIL("Settings load failed (err %d)", err);
 	}
 
 	err = bt_unpair(BT_ID_DEFAULT, BT_ADDR_LE_ANY);
 	if (err) {
-		FAIL("Unpairing failed (err %d)\n", err);
+		TEST_FAIL("Unpairing failed (err %d)", err);
 	}
 
 	connect_pair_subscribe();
@@ -347,7 +349,7 @@ void run_central(void)
 	connect_restore_sec();
 	disconnect();
 
-	PASS("Central test passed\n");
+	TEST_PASS("Central test passed");
 }
 
 void run_bad_central(void)
@@ -366,7 +368,7 @@ void run_bad_central(void)
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Bluetooth init failed (err %d)\n");
+		TEST_FAIL("Bluetooth init failed (err %d)");
 	}
 
 	LOG_DBG("Bluetooth initialized");
@@ -375,13 +377,13 @@ void run_bad_central(void)
 
 	err = settings_load();
 	if (err) {
-		FAIL("Settings load failed (err %d)\n");
+		TEST_FAIL("Settings load failed (err %d)");
 	}
 
 	connect_unsubscribe();
 	disconnect();
 
-	PASS("Bad Central test passed\n");
+	TEST_PASS("Bad Central test passed");
 
 	/* tell the good client that we disconnected from the server */
 	backchannel_sync_send(CLIENT_CLIENT_CHAN, GOOD_CLIENT_ID);
diff --git a/tests/bsim/bluetooth/host/security/ccc_update/src/common.h b/tests/bsim/bluetooth/host/security/ccc_update/src/common.h
index 4166fa2b6aa..2a004e40ec1 100644
--- a/tests/bsim/bluetooth/host/security/ccc_update/src/common.h
+++ b/tests/bsim/bluetooth/host/security/ccc_update/src/common.h
@@ -10,30 +10,6 @@
 #include <zephyr/logging/log.h>
 
 #include "bs_tracing.h"
-#include "bstests.h"
-
-#define FAIL(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Failed;                                                               \
-		bs_trace_error_time_line(__VA_ARGS__);                                             \
-	} while (0)
-
-#define PASS(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Passed;                                                               \
-		bs_trace_info_time(1, __VA_ARGS__);                                                \
-	} while (0)
-
-extern enum bst_result_t bst_result;
-
-#define CREATE_FLAG(flag) static atomic_t flag = (atomic_t) false
-#define SET_FLAG(flag)	  (void)atomic_set(&flag, (atomic_t) true)
-#define GET_FLAG(flag)	  (bool)atomic_get(&flag)
-#define UNSET_FLAG(flag)  (void)atomic_set(&flag, (atomic_t) false)
-#define WAIT_FOR_FLAG(flag)                                                                        \
-	while (!(bool)atomic_get(&flag)) {                                                         \
-		(void)k_sleep(K_MSEC(1));                                                          \
-	}
 
 LOG_MODULE_DECLARE(bt_bsim_ccc_update, LOG_LEVEL_DBG);
 
diff --git a/tests/bsim/bluetooth/host/security/ccc_update/src/main.c b/tests/bsim/bluetooth/host/security/ccc_update/src/main.c
index 4455e09d9f2..2ba29e07b68 100644
--- a/tests/bsim/bluetooth/host/security/ccc_update/src/main.c
+++ b/tests/bsim/bluetooth/host/security/ccc_update/src/main.c
@@ -3,33 +3,12 @@
  */
 
 #include <zephyr/kernel.h>
-
-#include "bs_types.h"
-#include "bs_tracing.h"
 #include "bstests.h"
-#include <string.h>
 
 #include <zephyr/logging/log.h>
 
 LOG_MODULE_REGISTER(bt_bsim_ccc_update, LOG_LEVEL_DBG);
 
-#define FAIL(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Failed;                                                               \
-		bs_trace_error_time_line(__VA_ARGS__);                                             \
-	} while (0)
-
-#define PASS(...)                                                                                  \
-	do {                                                                                       \
-		bst_result = Passed;                                                               \
-		bs_trace_info_time(1, __VA_ARGS__);                                                \
-	} while (0)
-
-extern enum bst_result_t bst_result;
-
-#define WAIT_TIME_S 60
-#define WAIT_TIME   (WAIT_TIME_S * 1e6)
-
 extern void run_peripheral(void);
 extern void run_central(void);
 extern void run_bad_central(void);
@@ -49,40 +28,20 @@ static void peripheral_main(void)
 	run_peripheral();
 }
 
-void test_tick(bs_time_t HW_device_time)
-{
-	if (bst_result != Passed) {
-		bst_result = Failed;
-		bs_trace_error_time_line("Test failed (not passed after %d seconds)\n",
-					 WAIT_TIME_S);
-	}
-}
-
-static void test_ccc_update_init(void)
-{
-	bst_ticker_set_next_tick_absolute(WAIT_TIME);
-}
-
 static const struct bst_test_instance test_def[] = {
 	{
 		.test_id = "central",
 		.test_descr = "Central device",
-		.test_pre_init_f = test_ccc_update_init,
-		.test_tick_f = test_tick,
 		.test_main_f = central_main,
 	},
 	{
 		.test_id = "bad_central",
 		.test_descr = "Bad Central device",
-		.test_pre_init_f = test_ccc_update_init,
-		.test_tick_f = test_tick,
 		.test_main_f = bad_central_main,
 	},
 	{
 		.test_id = "peripheral",
 		.test_descr = "Peripheral device",
-		.test_pre_init_f = test_ccc_update_init,
-		.test_tick_f = test_tick,
 		.test_main_f = peripheral_main,
 	},
 	BSTEST_END_MARKER};
diff --git a/tests/bsim/bluetooth/host/security/ccc_update/src/peripheral.c b/tests/bsim/bluetooth/host/security/ccc_update/src/peripheral.c
index 0cae51ba2d9..dae03f846a2 100644
--- a/tests/bsim/bluetooth/host/security/ccc_update/src/peripheral.c
+++ b/tests/bsim/bluetooth/host/security/ccc_update/src/peripheral.c
@@ -16,6 +16,8 @@
 
 #include <zephyr/settings/settings.h>
 
+#include "babblekit/testcase.h"
+#include "babblekit/flags.h"
 #include "common.h"
 #include "settings.h"
 
@@ -25,11 +27,11 @@
 #define GOOD_CLIENT_CHAN 0
 #define BAD_CLIENT_CHAN 1
 
-CREATE_FLAG(connected_flag);
-CREATE_FLAG(disconnected_flag);
-CREATE_FLAG(security_updated_flag);
+static DEFINE_FLAG(connected_flag);
+static DEFINE_FLAG(disconnected_flag);
+static DEFINE_FLAG(security_updated_flag);
 
-CREATE_FLAG(ccc_cfg_changed_flag);
+static DEFINE_FLAG(ccc_cfg_changed_flag);
 
 static const struct bt_uuid_128 dummy_service = BT_UUID_INIT_128(DUMMY_SERVICE_TYPE);
 
@@ -72,7 +74,7 @@ static void create_adv(struct bt_le_ext_adv **adv)
 
 	err = bt_le_ext_adv_create(&params, NULL, adv);
 	if (err) {
-		FAIL("Failed to create advertiser (%d)\n", err);
+		TEST_FAIL("Failed to create advertiser (%d)", err);
 	}
 }
 
@@ -89,7 +91,7 @@ static void start_adv(struct bt_le_ext_adv *adv)
 
 	err = bt_le_ext_adv_start(adv, &start_params);
 	if (err) {
-		FAIL("Failed to start advertiser (err %d)\n", err);
+		TEST_FAIL("Failed to start advertiser (err %d)", err);
 	}
 
 	LOG_DBG("Advertiser started");
@@ -101,7 +103,7 @@ static void stop_adv(struct bt_le_ext_adv *adv)
 
 	err = bt_le_ext_adv_stop(adv);
 	if (err) {
-		FAIL("Failed to stop advertiser (err %d)\n", err);
+		TEST_FAIL("Failed to stop advertiser (err %d)", err);
 	}
 }
 
@@ -112,7 +114,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
 	bt_addr_le_to_str(bt_conn_get_dst(conn), addr_str, sizeof(addr_str));
 
 	if (err) {
-		FAIL("Failed to connect to %s (err %d)\n", addr_str, err);
+		TEST_FAIL("Failed to connect to %s (err %d)", addr_str, err);
 	}
 
 	LOG_DBG("Connected: %s", addr_str);
@@ -176,7 +178,7 @@ static void connect_pair_check_subscribtion(struct bt_le_ext_adv *adv)
 
 	/* check that subscribtion request did not fail */
 	if (!is_peer_subscribed(default_conn)) {
-		FAIL("Good client did not subscribed\n");
+		TEST_FAIL("Good client did not subscribed");
 	}
 
 	stop_adv(adv);
@@ -197,7 +199,7 @@ static void connect_wait_unsubscribtion(struct bt_le_ext_adv *adv)
 
 	/* check that subscribtion is restored for bad client */
 	if (!is_peer_subscribed(default_conn)) {
-		FAIL("Subscribtion has not been restored for bad client\n");
+		TEST_FAIL("Subscribtion has not been restored for bad client");
 	}
 
 	/* confirm to bad client that the subscribtion had not been restored */
@@ -206,8 +208,8 @@ static void connect_wait_unsubscribtion(struct bt_le_ext_adv *adv)
 	backchannel_sync_wait(BAD_CLIENT_CHAN, BAD_CLIENT_ID);
 
 	/* check that unsubscribtion request didn't fail */
-	if (!GET_FLAG(ccc_cfg_changed_flag)) {
-		FAIL("Bad client didn't manage to update CCC config\n");
+	if (!IS_FLAG_SET(ccc_cfg_changed_flag)) {
+		TEST_FAIL("Bad client didn't manage to update CCC config");
 	}
 
 	/* confirm to bad client that unsubscribtion request has been well registered */
@@ -228,7 +230,7 @@ static void connect_restore_sec_check_subscribtion(struct bt_le_ext_adv *adv)
 
 	/* check that subscribtion hasn't been restored */
 	if (is_peer_subscribed(default_conn)) {
-		FAIL("Good client is subscribed\n");
+		TEST_FAIL("Good client is subscribed");
 	}
 
 	/* confirm to good client that the subscribtion has been well restored */
@@ -238,7 +240,7 @@ static void connect_restore_sec_check_subscribtion(struct bt_le_ext_adv *adv)
 
 	/* check that unsubscribtion request from good client has been registered */
 	if (is_peer_subscribed(default_conn)) {
-		FAIL("Good client did not unsubscribe\n");
+		TEST_FAIL("Good client did not unsubscribe");
 	}
 }
 
@@ -261,7 +263,7 @@ void peripheral_backchannel_init(void)
 	LOG_DBG("Opening back channels for device %d", device_number);
 	ch = bs_open_back_channel(device_number, device_numbers, channel_numbers, num_ch);
 	if (!ch) {
-		FAIL("Unable to open backchannel\n");
+		TEST_FAIL("Unable to open backchannel");
 	}
 }
 
@@ -305,7 +307,7 @@ void run_peripheral(void)
 
 	err = bt_enable(NULL);
 	if (err) {
-		FAIL("Bluetooth init failed (err %d)\n", err);
+		TEST_FAIL("Bluetooth init failed (err %d)", err);
 	}
 
 	LOG_DBG("Bluetooth initialized");
@@ -316,12 +318,12 @@ void run_peripheral(void)
 
 	err = settings_load();
 	if (err) {
-		FAIL("Settings load failed (err %d)\n", err);
+		TEST_FAIL("Settings load failed (err %d)", err);
 	}
 
 	err = bt_unpair(BT_ID_DEFAULT, BT_ADDR_LE_ANY);
 	if (err) {
-		FAIL("Unpairing failed (err %d)\n", err);
+		TEST_FAIL("Unpairing failed (err %d)", err);
 	}
 
 	create_adv(&adv);
@@ -335,5 +337,5 @@ void run_peripheral(void)
 	connect_restore_sec_check_subscribtion(adv);
 	WAIT_FOR_FLAG(disconnected_flag);
 
-	PASS("Peripheral test passed\n");
+	TEST_PASS("Peripheral test passed");
 }