192 lines
6.9 KiB
Python
192 lines
6.9 KiB
Python
# The MIT License (MIT)
|
|
#
|
|
# Copyright (c) 2020 Dan Halbert for Adafruit Industries
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
# of this software and associated documentation files (the "Software"), to deal
|
|
# in the Software without restriction, including without limitation the rights
|
|
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
# copies of the Software, and to permit persons to whom the Software is
|
|
# furnished to do so, subject to the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be included in
|
|
# all copies or substantial portions of the Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
# THE SOFTWARE.
|
|
"""
|
|
|
|
`adafruit_ble_ibbq`
|
|
================================================================================
|
|
|
|
BLE iBBQ Multiple Probe Thermometers
|
|
|
|
* Author(s): Dan Halbert for Adafruit Industries
|
|
|
|
Implementation Notes
|
|
--------------------
|
|
|
|
iBBQ protocol information is from https://gist.github.com/uucidl/b9c60b6d36d8080d085a8e3310621d64.
|
|
|
|
**Hardware:**
|
|
|
|
InkBird and EasyBBQ (from PyleUSA) are brands that use the iBBQ protocol in their products.
|
|
"""
|
|
|
|
import struct
|
|
|
|
import _bleio
|
|
from adafruit_ble.attributes import Attribute
|
|
from adafruit_ble.services import Service
|
|
from adafruit_ble.uuid import StandardUUID
|
|
from adafruit_ble.characteristics import Characteristic, ComplexCharacteristic
|
|
|
|
__version__ = "0.0.0-auto.0"
|
|
__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_BLE_iBBQ.git"
|
|
|
|
|
|
class _SettingsResult(ComplexCharacteristic):
|
|
"""Notify-only characteristic of results from SettingsData messages"""
|
|
|
|
uuid = StandardUUID(0xFFF1)
|
|
|
|
def __init__(self):
|
|
super().__init__(properties=Characteristic.NOTIFY)
|
|
|
|
def bind(self, service):
|
|
"""Bind to an IBBQService."""
|
|
bound_characteristic = super().bind(service)
|
|
bound_characteristic.set_cccd(notify=True)
|
|
# Use a PacketBuffer that can store one packet to receive the data.
|
|
return _bleio.PacketBuffer(bound_characteristic, buffer_size=1)
|
|
|
|
|
|
class _RealtimeData(ComplexCharacteristic):
|
|
"""Notify-only characteristic of results from temperature probes"""
|
|
|
|
uuid = StandardUUID(0xFFF4)
|
|
|
|
def __init__(self):
|
|
super().__init__(properties=Characteristic.NOTIFY)
|
|
|
|
def bind(self, service):
|
|
"""Bind to an IBBQService."""
|
|
bound_characteristic = super().bind(service)
|
|
bound_characteristic.set_cccd(notify=True)
|
|
# Use a PacketBuffer that can store one packet to receive the data.
|
|
return _bleio.PacketBuffer(bound_characteristic, buffer_size=1)
|
|
|
|
|
|
class IBBQService(Service):
|
|
"""Service for reading from an iBBQ thermometer.
|
|
"""
|
|
|
|
_CREDENTIALS_MSG = b"\x21\x07\x06\x05\x04\x03\x02\x01\xb8\x22\x00\x00\x00\x00\x00"
|
|
_REALTIME_DATA_ENABLE_MSG = b"\x0B\x01\x00\x00\x00\x00"
|
|
_UNITS_FAHRENHEIT_MSG = b"\x02\x01\x00\x00\x00\x00"
|
|
_UNITS_CELSIUS_MSG = b"\x02\x00\x00\x00\x00\x00"
|
|
_REQUEST_BATTERY_LEVEL_MSG = b"\x08\x24\x00\x00\x00\x00"
|
|
|
|
@staticmethod
|
|
def target_temp_msg(low, high):
|
|
return struct.pack("<HH", low, high)
|
|
|
|
def __init__(self, service=None):
|
|
super().__init__(service=service)
|
|
self._settings_result_buf = bytearray(self.settings_result.packet_size)
|
|
self._realtime_data_buf = bytearray(self.realtime_data.packet_size)
|
|
|
|
uuid = StandardUUID(0xFFF0)
|
|
|
|
settings_result = _SettingsResult()
|
|
|
|
account_and_verify = Characteristic(
|
|
uuid=StandardUUID(0xFFF2),
|
|
properties=Characteristic.WRITE,
|
|
read_perm=Attribute.NO_ACCESS,
|
|
)
|
|
"""Send credentials to this characteristic."""
|
|
|
|
# Not yet understood, not clear if available.
|
|
# history_data = Characteristic(uuid=StandardUUID(0xFFF3),
|
|
# properties=Characteristic.NOTIFY,
|
|
# write_perm=Attribute.NO_ACCESS)
|
|
|
|
realtime_data = _RealtimeData()
|
|
"""Real-time temperature values."""
|
|
|
|
settings_data = Characteristic(
|
|
uuid=StandardUUID(0xFFF5),
|
|
properties=Characteristic.WRITE,
|
|
read_perm=Attribute.NO_ACCESS,
|
|
)
|
|
"""Send control messages here."""
|
|
|
|
@property
|
|
def settings_result_bytes(self):
|
|
length = self.settings_result.readinto(self._settings_result_buf)
|
|
return self._settings_result_buf[:length]
|
|
|
|
@property
|
|
def realtime_data_bytes(self):
|
|
length = self.realtime_data.readinto(self._realtime_data_buf)
|
|
return self._realtime_data_buf[:length]
|
|
|
|
def init(self):
|
|
"""Perform initial "pairing", which is not regular BLE pairing."""
|
|
self.account_and_verify = self._CREDENTIALS_MSG
|
|
self.settings_data = self._REALTIME_DATA_ENABLE_MSG
|
|
|
|
def display_fahrenheit(self):
|
|
"""Display temperatures on device in degrees Fahrenheit.
|
|
|
|
Note: This does not change the units returned by `temperatures`.
|
|
"""
|
|
self.settings_data = self._UNITS_FAHRENHEIT_MSG
|
|
|
|
def set_to_celsius(self):
|
|
"""Display temperatures on device in degrees Celsius.
|
|
|
|
Note: This does not change the units returned by `temperatures`.
|
|
"""
|
|
self.settings_data = self._UNITS_CELSIUS_MSG
|
|
|
|
@property
|
|
def temperatures(self):
|
|
"""Return a tuple of temperatures for all the possible temperature probes on the device.
|
|
Temperatures are in degrees Celsius. Unconnected probes return 0.0.
|
|
"""
|
|
data = self.realtime_data_bytes
|
|
if not data:
|
|
return None
|
|
return tuple(
|
|
struct.unpack_from("<H", data, offset=offset)[0] / 10
|
|
for offset in range(0, len(data), 2)
|
|
)
|
|
|
|
@property
|
|
def battery_level(self):
|
|
"""Get current battery level in volts as ``(current_voltage, max_voltage)``.
|
|
Results are approximate and may differ from the
|
|
actual battery voltage by 0.1v or so.
|
|
"""
|
|
self.settings_data = self._REQUEST_BATTERY_LEVEL_MSG
|
|
result = self.settings_result_bytes
|
|
if len(result) >= 5:
|
|
# There can be at least one extra byte at the end, so use unpack_from().
|
|
header, current_voltage, max_voltage = struct.unpack_from("<BHH", result)
|
|
if header == 0x24:
|
|
# Calibration was determined empirically, by comparing
|
|
# the returned values with actual measurements of battery voltage,
|
|
# on one sample each of two different products.
|
|
return (
|
|
current_voltage / 2000 - 0.3,
|
|
(6550 if max_voltage == 0 else max_voltage) / 2000,
|
|
)
|
|
# Unexpected response.
|
|
return None
|