MicroPython • Two way bluetooth

Code:

import sysimport aiobleimport bluetoothimport machineimport uasyncio as asynciofrom micropython import constfrom pimoroni import Buttondef uid():    """ Return the unique id of the device as a string """    return "{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}".format(        *machine.unique_id())MANUFACTURER_ID = const(0x02A29)MODEL_NUMBER_ID = const(0x2A24)SERIAL_NUMBER_ID = const(0x2A25)HARDWARE_REVISION_ID = const(0x2A26)BLE_VERSION_ID = const(0x2A28)button_a = Button(12)button_b = Button(13)button_x = Button(14)button_y = Button(15)led = machine.Pin("LED", machine.Pin.OUT)_ENV_SENSE_UUID = bluetooth.UUID(0x180A)_GENERIC = bluetooth.UUID(0x1848)_ENV_SENSE_TEMP_UUID = bluetooth.UUID(0x1800)_BUTTON_UUID = bluetooth.UUID(0x2A6E)_BLE_APPEARANCE_GENERIC_REMOTE_CONTROL = const(384)# Advertising frequencyADV_INTERVAL_MS = 250_000device_info = aioble.Service(_ENV_SENSE_UUID)connection = None# Create characteristics for device infoaioble.Characteristic(device_info, bluetooth.UUID(MANUFACTURER_ID), read=True, initial="KevsRobotsRemote")aioble.Characteristic(device_info, bluetooth.UUID(MODEL_NUMBER_ID), read=True, initial="1.0")aioble.Characteristic(device_info, bluetooth.UUID(SERIAL_NUMBER_ID), read=True, initial=uid())aioble.Characteristic(device_info, bluetooth.UUID(HARDWARE_REVISION_ID), read=True, initial=sys.version)aioble.Characteristic(device_info, bluetooth.UUID(BLE_VERSION_ID), read=True, initial="1.0")remote_service = aioble.Service(_GENERIC)button_characteristic = aioble.Characteristic(    remote_service, _BUTTON_UUID, read=True, notify=True)print('registering services')aioble.register_services(remote_service, device_info)connected = Falseasync def remote_task():    """ Send the event to the connected device """    while True:        if not connected:            print('not connected')            await asyncio.sleep_ms(1000)            continue        if button_a.read():            print(f'Button A pressed, connection is: {connection}')            button_characteristic.write(b"a")               button_characteristic.notify(connection,b"a")        elif button_b.read():            print('Button B pressed')            button_characteristic.write(b"b")            button_characteristic.notify(connection,b"b")        elif button_x.read():            print('Button X pressed')            button_characteristic.write(b"x")            button_characteristic.notify(connection,b"x")        elif button_y.read():            print('Button Y pressed')            button_characteristic.write(b"y")            button_characteristic.notify(connection,b"x")        else:            button_characteristic.write(b"!")        await asyncio.sleep_ms(10)            # Serially wait for connections. Don't advertise while a central is# connected.    async def peripheral_task():    print('peripheral task started')    global connected, connection    while True:        connected = False        async with await aioble.advertise(            ADV_INTERVAL_MS,             name="KevsRobots",             appearance=_BLE_APPEARANCE_GENERIC_REMOTE_CONTROL,             services=[_ENV_SENSE_TEMP_UUID]        ) as connection:            print("Connection from", connection.device)            connected = True            print(f"connected: {connected}")            await connection.disconnected()            print(f'disconnected')        async def blink_task():    print('blink task started')    toggle = True    while True:        led.value(toggle)        toggle = not toggle        blink = 1000        if connected:            blink = 1000        else:            blink = 250        await asyncio.sleep_ms(blink)        async def main():    tasks = [        asyncio.create_task(peripheral_task()),        asyncio.create_task(blink_task()),        asyncio.create_task(remote_task()),    ]    await asyncio.gather(*tasks)asyncio.run(main())

Code:

import aiobleimport bluetoothimport machineimport uasyncio as asyncio# Bluetooth UUIDS can be found online at https://www.bluetooth.com/specifications/gatt/services/_REMOTE_UUID = bluetooth.UUID(0x1848)_ENV_SENSE_UUID = bluetooth.UUID(0x1800) _REMOTE_CHARACTERISTICS_UUID = bluetooth.UUID(0x2A6E)led = machine.Pin("LED", machine.Pin.OUT)connected = Falsealive = Falseasync def find_remote():    # Scan for 5 seconds, in active mode, with very low interval/window (to    # maximise detection rate).    async with aioble.scan(5000, interval_us=30000, window_us=30000, active=True) as scanner:        async for result in scanner:            # See if it matches our name            if result.name() == "KevsRobots":                print("Found KevsRobots")                for item in result.services():                    print (item)                if _ENV_SENSE_UUID in result.services():                    print("Found Robot Remote Service")                    return result.device                return Noneasync def blink_task():    """ Blink the LED on and off every second """        toggle = True        while True and alive:        led.value(toggle)        toggle = not toggle        # print(f'blink {toggle}, connected: {connected}')        if connected:            blink = 1000        else:            blink = 250        await asyncio.sleep_ms(blink)async def peripheral_task():    print('starting peripheral task')    global connected    connected = False    device = await find_remote()    if not device:        print("Robot Remote not found")        return    try:        print("Connecting to", device)        connection = await device.connect()            except asyncio.TimeoutError:        print("Timeout during connection")        return          async with connection:        print("Connected")        connected = True        alive = True        while True and alive:            try:                robot_service = await connection.service(_REMOTE_UUID)                print(robot_service)                control_characteristic = await robot_service.characteristic(_REMOTE_CHARACTERISTICS_UUID)                print(control_characteristic)            except asyncio.TimeoutError:                print("Timeout discovering services/characteristics")                return            while True:                if control_characteristic != None:                    try:                        command = await control_characteristic.read()#                         print(f"Command: {temp_deg_c}")                        if command == b'a':                            print("a button pressed")                        if command == b'b':                            print("b button pressed")                        if command == b'x':                            print("x button pressed")                        if command == b'y':                            print("y button pressed")                    except TypeError:                        print(f'something went wrong; remote disconnected?')                        connected = False                        alive = False                        return                    except asyncio.TimeoutError:                        print(f'something went wrong; timeout error?')                        connected = False                        alive = False                        return                    except asyncio.GattError:                        print(f'something went wrong; Gatt error - did the remote die?')                        connected = False                        alive = False                        return                else:                    print('no characteristic')                await asyncio.sleep_ms(10)async def main():    tasks = []    tasks = [        asyncio.create_task(blink_task()),        asyncio.create_task(peripheral_task()),    ]    await asyncio.gather(*tasks)    while True:    asyncio.run(main())