bleak_receiver.py

'''
Reading and decoding temperature values over BLE from Arduino BLE Sense
'''

import asyncio

from bleak import BleakClient
from bleak.backends.characteristic import BleakGATTCharacteristic

ADDRESS = "E6:A3:44:CD:9C:4F" # BLE sense
TEMP_UUID = "00002a6e-0000-1000-8000-00805f9b34fb" # temperature characteristic, data from HTS221
HUM_UUID = "00002a6f-0000-1000-8000-00805f9b34fb" # humidity characteristic, data from HTS221
PRESS_UUID = "00002a6d-0000-1000-8000-00805f9b34fb" # pressure characteristic, data from LPS22
LIGHT_UUID = "00002a77-0000-1000-8000-00805f9b34fb" # irradiance characteristic (clear light data from APDS9660)
BATT_UUID = "00002a19-0000-1000-8000-00805f9b34fb" # battery level characteristic (dummy ADC reading on pin A0)

def notification_handler(characteristic: BleakGATTCharacteristic, data: bytearray):
    '''prints received data'''

    # for test purposes just the first byte of each characteristic, without any decoding and conversions

    value = data[0]
    
    print(f'{characteristic.description}: {value}')


async def main(address, char_uuids):
    async with BleakClient(address) as client:
        print(f'Connected: {client.is_connected}')

        for uuid in char_uuids:
            await client.start_notify(uuid, notification_handler)
        
        while True:
        
            await asyncio.sleep(5.0)

        for uuid in char_uuids:
            await client.stop_notify(uuid)


asyncio.run(main(ADDRESS, [BATT_UUID, TEMP_UUID, HUM_UUID, PRESS_UUID, LIGHT_UUID]))