Unable to emit from a GPIO.add_event_detect

I’m trying to send some data to a client when an LED blinks thats connected to an IO on a raspberry pi.

I know this is a threading issue I’m just not sure how to handle it. the emit needs to be awaited which means the callback function that the GPIO.add_event_detect calls needs to be async, but then that callback function needs to be awaited when called from the GPIO event. I’m not sure how to handle this. The below produces “RuntimeWarning: coroutine ‘my_callback_one’ was never awiated”

sio = socketio.AsyncServer(async_mode='sanic')

app = Sanic()
sio.attach(app)

GPIO.setmode(GPIO.BOARD)

GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)


async def my_callback_one(channel):
    await sio.emit('my_response', {'data': 'test'})
    print('========button press LED lighting detected========')

GPIO.add_event_detect(18, GPIO.RISING, callback=my_callback_one)

[miguelgrinberg]

Is the GPIO library compatible with asyncio? You can’t use code that was written to be synchronous with asyncio, unfortunately.

[Souldat]

I think the best / easiest solution for me right now is to just write my gpio results to a file and read that file from my other thread on a loop and send that up to the client.