Okay, i didn't get a errormessage if i send a MQTT-Message with the MQTT-Explorer and the Explorer shows the "Test Topic". I try to setup a Wiedemann & Theiss WLAN Thermometer (Pt100). This is my MQTT-Config in the Thermometer. Host: 192.168.1.111 Port: 1883 Enable: True Encrypted: False Username: Empty Password: Empty