Publishing to self_topic_root/reload no longer works

[drinfernoo]

Describe the Bug

I added a new sensor today, and after modifying sensors.yaml to change the name and device class, tried publishing to wyzesense2mqtt/reload... But that just makes the container stop working. During this process, I was tailing the container log (docker logs -f wyzesense2mqtt), and nothing happened after the reload message was received, including any further state updates from the sensors. Restarting the container restored regular behavior.

Steps To Reproduce

Steps to reproduce the behavior:

1. Publish a message to self_topic_root/reload

Expected Behavior

Publishing a reload message should... reload the sensors 😅

Additional Context

The last bit of my log, and then nothing happened after this:

Sending PUBLISH (d0, q2, r1, m12685), 'b'wyzesense2mqtt/77C006C8'', ... (239 bytes)
Received PUBREC (Mid: 12685)
Sending PUBREL (Mid: 12685)
Received PUBCOMP (Mid: 12685)
State event data: [2021-09-20 17:15:40][77C00CE1]AlarmEvent: sensor_type=motionv2, state=active, battery=98, signal=72
{'event': 'alarm', 'available': True, 'mac': '77C00CE1', 'device_class': 'motion', 'last_seen': 1632183340.093, 'last_seen_iso': '2021-09-20T17:15:40.093000', 'signal_strength': -72, 'battery': 98, 'name': 'Back Porch Motion', 'state': 1}
Sending PUBLISH (d0, q2, r1, m12686), 'b'wyzesense2mqtt/77C00CE1'', ... (238 bytes)
Received PUBREC (Mid: 12686)
Sending PUBREL (Mid: 12686)
Received PUBCOMP (Mid: 12686)
Received PUBLISH (d0, q0, r0, m0), 'wyzesense2mqtt/reload', ...  (0 bytes)
In on_message_reload:
Reading sensors configuration...

[AK5nowman]

@drinfernoo Can you check to ensure the formatting on your sensors.yaml file is correct? Though I would expect this to print an error...hmm.
Try adding the following before 181

if (SENSORS is None):
        LOGGER.error(f"Failed to load sensors.yaml.")

[drinfernoo]

Adding those lines, and then publishing to wyzesense2mqtt/reload... allowed the reload to work. Maybe the issue I was experiencing was a fluke, but it seemed like it would happen every time 🤔

Those lines shouldn't have affected the behavior of the script, from what I can tell... though there are a few lines lower that might fail if SENSORS is None:

wyzesense2mqtt/wyzesense2mqtt/wyzesense2mqtt.py

Line 181 in 944f916

for sensor_mac in SENSORS:

wyzesense2mqtt/wyzesense2mqtt/wyzesense2mqtt.py

Line 206 in 944f916

for sensor_mac in SENSORS:

But as you mentioned, I would think these would give an error.

My sensors.yaml is definitely formatted correctly... or none of my sensors would work at all 😉

[drinfernoo]

I still have this odd behavior... wondering what we can do to fix this 🤔