samples: mgmt: updatehub: Remove GSM modem overlay

The gsm modem driver is deprecated and will be removed. Remove
the build overlay and dependency on the gsm modem from the
updatehub sample.

The new cellular modem driver and subsystem use the native
networking stack and the pm subsystem, so just like ethernet,
enabling the cellular modem is up to the board configuration.

Signed-off-by: Bjarki Arge Andreasen <bjarki@arge-andreasen.me>

samples/subsys/mgmt/updatehub/README.rst

@@ -34,7 +34,7 @@ Caveats
   application should build and run for other platforms with same connectivity.
 
 * The sample provides overlay files to enable other technologies like WIFI,
-  modem, 802.15.4 or OpenThread.  These technologies depends on
+  802.15.4 or OpenThread.  These technologies depends on
   hardware resources and the correspondent overlay was designed to be generic
   instead full optimized.
 
@@ -199,23 +199,7 @@ for details.
     The board disco_l475_iot1 is not supported.  The es-WIFI driver currently
     doesn't support UDP.
 
-Step 4.3: Build for Modem
--------------------------
-
-Modem needs add ``overlay-modem.conf``.  Now, a DTC overlay file is used to
-configure the glue between the modem and an arduino headers.  The modem config
-uses PPP over GSM modem, see :zephyr:code-sample:`gsm-modem` sample application.
-
-.. zephyr-app-commands::
-    :zephyr-app: zephyr/samples/subsys/mgmt/updatehub
-    :board: [ frdm_k64f | nrf52840dk/nrf52840 | nucleo_f767zi ]
-    :build-dir: app
-    :gen-args: -DEXTRA_CONF_FILE="overlay-modem.conf;overlay-prj.conf" \
-      -DDTC_OVERLAY_FILE=arduino.overlay
-    :goals: build
-    :compact:
-
-Step 4.4: Build for IEEE 802.15.4 [experimental]
+Step 4.3: Build for IEEE 802.15.4 [experimental]
 ------------------------------------------------
 
 For IEEE 802.15.4 needs add ``overlay-802154.conf``.  This requires two nodes:
@@ -242,7 +226,7 @@ tested with both native linux driver and ``atusb`` and with ``wpanusb`` sample.
     :goals: build
     :compact:
 
-Step 4.6: Build for OpenThread Network [experimental]
+Step 4.4: Build for OpenThread Network [experimental]
 -----------------------------------------------------
 
 The OpenThread requires the ``overlay-ot.conf``.  It requires two nodes:

samples/subsys/mgmt/updatehub/arduino.overlay

@@ -1,13 +0,0 @@
-/*
- * Copyright (c) 2020 O.S.Systems
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-&arduino_serial {
-	status = "okay";
-	current-speed = <115200>;
-	gsm: gsm-modem {
-		compatible = "zephyr,gsm-ppp";
-	};
-};

samples/subsys/mgmt/updatehub/overlay-modem.conf

@@ -1,28 +0,0 @@
-# Copyright (c) 2020 O.S.Systems
-# SPDX-License-Identifier: Apache-2.0
-
-# Disable default configs
-CONFIG_NET_L2_ETHERNET=n
-
-CONFIG_NET_DHCPV4=n
-
-CONFIG_NET_CONFIG_SETTINGS=n
-
-# UART support
-CONFIG_SERIAL=y
-
-# GSM modem support
-CONFIG_MODEM=y
-CONFIG_MODEM_SHELL=y
-CONFIG_MODEM_GSM_PPP=y
-CONFIG_MODEM_GSM_APN="<Your Access Point Network>"
-
-# PPP networking support
-CONFIG_NET_DRIVERS=y
-CONFIG_NET_NATIVE=y
-CONFIG_NET_PPP=y
-CONFIG_NET_L2_PPP=y
-CONFIG_NET_L2_PPP_TIMEOUT=10000
-
-CONFIG_DNS_SERVER_IP_ADDRESSES=y
-CONFIG_DNS_SERVER1="8.8.8.8"

samples/subsys/mgmt/updatehub/src/main.c

@@ -19,11 +19,6 @@
 #include "c_certificates.h"
 #endif
 
-#if defined(CONFIG_MODEM_GSM_PPP)
-#define GSM_NODE DT_COMPAT_GET_ANY_STATUS_OKAY(zephyr_gsm_ppp)
-#define UART_NODE DT_BUS(GSM_NODE)
-#endif
-
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(main);
 
@@ -143,12 +138,6 @@ int main(void)
 		LOG_INF("Connect request failed %d. Waiting iface be up...", ret);
 		k_msleep(500);
 	}
-
-#elif defined(CONFIG_MODEM_GSM_PPP)
-	const struct device *const uart_dev = DEVICE_DT_GET(UART_NODE);
-
-	LOG_INF("APN '%s' UART '%s' device %p", CONFIG_MODEM_GSM_APN,
-		uart_dev->name, uart_dev);
 #endif
 
 	net_mgmt_init_event_callback(&mgmt_cb, event_handler, EVENT_MASK);