During my attempts to configure the OH3 MQTT system broker connection, I noticed a possible bug.
I am able to make the first configuration and save it under an arbitrary “Connection name”:
The only way to overcome this is to change the Connection name and then Save the settings again.
If I try to re-use any Connection name previously used, the settings cannot be saved (“ignore existing broker” warning), so I believe these connections appear as “ghost” entries somewhere in the OH3 settings database.
I can’t help with the exact issue, except to say that the MQTT System Broker Connection should not exist in OH3. It is a relic from OH2, and should have been removed, but here we are.
I’d recommend removing the connection you’ve made, and setup a connection to your broker via a Thing, as described here or here.
Thanks, I already created a MQTT Broker thing which works perfectly.
I was under the impression that the System broker is also needed, given the fact that it is present in OH3/Settings/Other Services.
I cannot delete the settings that I already made in MQTT system broker connection.
On the other hand I noticed the MQTT System broker thing appears in error (error:comm) and it is not able to connect to mosquitto: