It turns out that V_UNIT_PREFIX is not supported by OpenHAB's MySensors binding.

@gohan thanks, however the issue i'm having is not in the HVAC implementation, but in the messaging..

Without any evidence - yes. I have not made that much tests yet since I waited for my logger. I have made some posts about this on the forum. I dont want to make any conclusions yet. @gohan

Thanks for your fast reply. That sounds easy. And you think that the communication between sensor nodes and Gateway are still possible via wired RS485? I tried to find an example on this site for sending Information from Gateway to sensor nodes. (via SendMessage ?) For example I like to Switch on/off an light that is connected to an relay board at my sensor node. Communcation Flow: OpenHab2 --> MQTT --> Gateway --> RS485 --> Sensor Node --> Relay Board Currently I have an working RS485 Connection between my Arduino Uno's with the use from SoftwareSerial library. During my testings I realized, that the message that I triy to send "Hello" will be sent to the other arduino char by char. Is that true? Because I tried to raise up an pin on HIGH with "if(msg == "Hello")..." But it doesn't worked. Will the sendMsg method from the MySensor library handle this out of the box? Regards, Simon

Hi, It worked. using the 2.2 library solved my issue. Now I'll setup openhab. thanks for your quick and effective answer

@George-Laynes said in OpenHAB 2.1 keeps showing light level as 0 with BH1750 and V_LEVEL: Any idea on how soon it'll be available for general public? Very soon. The next release is finished in the next days. But it will not be backwards compatible because there was a change in the naming of the parameters, for example: skipStartupCheck is now named startupCheckEnabled, so I need to think about migration options.

@micah said in Can't get OpenHAB2 to see my MQTT messages: I'm still not sure if the second and third line in the mqtt-eventbus.cfg is correct. I don't have MyMQTT anywhere else, so I think I may try different combinations to see what works. MyMQTT should be replaced with brokername (mysensors in this example). openhab will then publish the event to the mqtt broker on its topics (useful if you use f.eks. node-red for openhab rules)