I have 3 Airthings NS instances running (using different hubs/API tokens). At 19:28:59 Eastern time, one of the three reported this error:

2023-08-17 19:28:59,098 Thread-1076 udi_interface.interface ERROR    interface:send: MQTT Publish Error: [SSL: BAD_LENGTH] bad length (_ssl.c:2488)
Traceback (most recent call last):
  File "/var/polyglot/.local/lib/python3.9/site-packages/udi_interface/interface.py", line 632, in send
    self._mqttc.publish(topic, json.dumps(message), retain=False)
  File "/var/polyglot/.local/lib/python3.9/site-packages/paho/mqtt/client.py", line 1257, in publish
    rc = self._send_publish(
  File "/var/polyglot/.local/lib/python3.9/site-packages/paho/mqtt/client.py", line 2693, in _send_publish
    return self._packet_queue(PUBLISH, packet, mid, qos, info)
  File "/var/polyglot/.local/lib/python3.9/site-packages/paho/mqtt/client.py", line 3016, in _packet_queue
    return self.loop_write()
  File "/var/polyglot/.local/lib/python3.9/site-packages/paho/mqtt/client.py", line 1577, in loop_write
    rc = self._packet_write()
  File "/var/polyglot/.local/lib/python3.9/site-packages/paho/mqtt/client.py", line 2464, in _packet_write
    write_length = self._sock_send(
  File "/var/polyglot/.local/lib/python3.9/site-packages/paho/mqtt/client.py", line 649, in _sock_send
    return self._sock.send(buf)
  File "/usr/local/lib/python3.9/ssl.py", line 1174, in send
    return self._sslobj.write(data)
ssl.SSLError: [SSL: BAD_LENGTH] bad length (_ssl.c:2488)
2023-08-17 19:28:59,099 MQTT       udi_interface.interface INFO     interface:_disconnect: MQTT Unexpected disconnection. Trying to reconnect in 10 seconds. rc: 7

The two other instances did not report this or any other any issues around that time.

Am on PG3 3.1.21 and IoX 5.6.4 on Polisy.

That's a PG3 issue I've seen before. Will need @bmercier to look into it.

Sent from my Pixel 6 Pro using Tapatalk

This problem is related to a communication error with the PG3 embedded MQTT server.

I recommend migrating to PG3x, this should fix this problem. PG3x uses Mosquitto MQTT server.

In addition, we no longer maintain PG3.