Hi. I have a fresh installation on RPI2. I added MQTT binding in paperUI. It did not work because I did not configure mqtt.cfg. So I followed some instruction on how to fix that. I had double entries in Karaf console, so I deleted them. Restarted openhab, and now I have NO activity in openhab.log …

Problem gone! I deleted the mqtt enrtry from the Karaf database again, and it suddenly started to display some mqtt errors in the log. Than, after a restart it connected correctly! Great! Now on to the next problem! :slightly_smiling_face:

[SOLVED] MQTT not starting

Setup, Configuration and Use Beginners

rlkoshak (Rich Koshak) September 19, 2017, 9:47pm 2

It is unclear what exactly you have done and in what order so I recommend uninstalling the binding, removing the mqtt.cfg and /var/lib/openhab2/config/org/openhab/mqtt.config files and restarting OH. Then follow these instructions: