Mosquitto MQTT binding not connecting to broker anymore (openhab 3.2.0)

[hafniumzinc (T)]

Also double check your Mosquitto: has it updated recently?

https://mosquitto.org/documentation/migrating-to-2-0/

Updating Mosquitto MQTT from 1.x to v2.0+

As part of my setup, I have a Mosquitto MQTT broker running in a Docker container. This has been an excellent setup, but a couple of days ago, it failed completely - turns out the image tag ‘latest’ had switched to 2.0.9 from 1.6.x, and there were some breaking changes! The fix was relatively simple in the end, but took me a while to figure out, so I thought I’d document it here in case anyone else faces the same. Important note - I don’t have any type of authentication in my MQTT network - th…