I'm trying to debug with PyCharm a very simple AWS IOT Core application. This is the pubsub.py from the AWS tutorial. The application is cloned from here: https://github.com/aws/aws-iot-device-sdk-python-v2.git, in this location: /sample/pubsub.py.
At some point, there is a call to mqtt_connection.subscribe(...,callback=on_message_received)
It is working fine, and the code within on_message_received is running (The prints command actually print). However, putting a breakpoint - the PyCharm debugger doesn't stop there.
A related question: On what thread the callback is being called, or is it asyncio thing (I don't see any sign to async io).