Bluetooth aioble threading

OpenMV Boards
1

Hi,

I’m running into a threading issue when switching from the old ble_temperature.py with bluetooth.BLE() to the new temp_sensor_aioble.py with aioble.

When I used to run self._ble.gap_advertise(interval_us, adv_data=self._payload), the thread would continue while waiting for a connection. In the latest firmware, it errors out on self._ble.active(True).

So I switched over to aioble, but when asyncio.run(main()) is called, the thread hangs until a connection is made via async with await aioble.advertise( and no other code runs while waiting for a connection.

In the temp_sensor_aioble.py example, it only prints 2 after a connection is made:

print("1")
asyncio.run(main())
print("2")

Is there a way to keep the cam processing while waiting for a BLE connection and waiting for a charicteristic to be written to?

2

You just need to run your code in another asyncio task, and it should occasionally yield with await asyncio.sleep().

Note these examples are based on ones from MicroPython, I’m not a BLE/aioble expert, if you need more help with this you could try MicroPython’s discussions or their discord.

3

Ah, so its asyncio tasks all the way down. Thanks!