[SOLVED] Turn on Homematic switch based on MQTT event with MQTT 2.4 binding

Add-ons Bindings
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I have an external application (Node-RED Dashboard) with a button that triggers an MQTT event. Until OH 2.3 I used the MQTT eventbus to turn a Homematic switch on/off based by sending “ON” or “OFF” to topic “openHAB/in/HMSwitch/command”. How do I do this with the new MQTT Binding 2.4 without the MQTT Eventbus?

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You will need to create an MQTT thing broker and then a generic MQTT thing with a switch channel subscribing to the topic on the state. Don’t forget to add the isCommand parameter so that the state change will be passed as a command to the other channels for that item

And then add the channel to your item.

See: https://www.openhab.org/blog/2018-12-16-mqtt-arrives-in-the-modern-openhab-2-x-architecture.html

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