@Gargam3L0,
unfortunately I do not have any experience with the embedded MQTT broker
but to add to my comments above:
it seems that there are two places with configuration files for addons
- addons.cfg (/etc/openhab2/services/addons.cfg)
- addons.config (/var/lib/openhab2/config/org/openhab/addons.config) (in principle not to be edited)
and to on top there is a database where the configuration through PaperUI is saved.
How I do understand the matter is that with the update from M1 to M2 (and M3) some locations were changed (I have been affected by mail and restdocs)
changes to the configuration through Paper UI and addons.cfg need some time to update the running configuration and even restarts might be necessary.
Keep in mind that if you do any configuration in the addons.cfg file this seems to over-wright the Paper UI configuration.
Applying changes might need time and patience
Looking under
you might find more support