Checked the code for MQTT.cpp and find the following (https://github.com/domoticz/domoticz/blob/master/hardware/MQTT.cpp - +- at Line 268) ... else if (szCommand == "switchscene") { if (root["idx"].empty()) goto mqttinvaliddata; if (!root["idx"].isInt64()) goto mqttinvaliddata; idx = (unsigned long ...

Retel, I'm getting the exact same error. The MQTT message: {"command": "setuservariable", "idx" : 1,"name" : "windspeed" , "type" : "1" , "value": "10"} gives the following error in the Domoticz log: 2015-10-27 18:29:35.777 MQTT: Topic: domoticz/in, Message: {"command":"setuservariable","idx":1 ...