@sundberg84 Is there any trick to get this to work in Domoticz ? I have just added a heartbeat to one of my sketches and I don't see any changes in the last seen time for that node in Domoticz. The serial monitor for the node reports the heartbeat is sent TSP:SANCHK:OK TSP:MSG:SEND 8-8-0-0 s=255,c=3,t=22,pt=5,l=4,sg=0,ft=0,st=ok:1258134 Heartbeat Sent But I get nothing in Domoticz, should I see it in the log file?