Much better! MQTT is online now. Thanks!
If anyone is reading the thread:
- First start mosquitto MQTT broker with sudo openhabian-config Its located in Optional components then select Mosquitto
- Remember user password (user is openhabian)
- In the openhab GUI install in addons mqtt
- Then follow Migrating MQTT1 items to MQTT2.4 items
- you will need to add your user / password combination. I disabled secure connection (TLS)
- if anything goes wrong, uninstall on PaperUI and clean the cache:
sudo systemctl stop openhab2
sudo openhab-cli clean-cache
Summary
sudo systemctl start openhab2
- redo the steps above.
Next step for me: Bring my sonoff into the GUI