You can set device unused, with this command:

http://192.168.2.10:8084/json.htm?type=setunused&idx=6

In the MySensors development version the gateway can be a sensor node too. The domoticz send the heartbeat message to the gateway in every 10 second, but do nothing with the response. If the heartbeat response processed as incoming data the "data timeout" funtion will work properly. I have made a ...