Indeed if you can configure the root topic in openHAB that should work otherwise the default would be ‘homie’. The userID should be OK as is.
I’m assuming gBridge allows creation of all the other sub topics. Using the gBridge MQTT broker creates a cloud dependency of course which slows things down. Bridging a local broker would be my recommendation.
Ahh no… (gBridge does not support the homie3 spec). Instead you will have to manually create the devices through gBridge. It just means that the status and control topics are linked.
Also the default topics gBridge suggests are misleading - the /set subtopic should be on the
Action topic not the
Status - there is more info 4 posts below and also in the gBridge thread in this community