Great suggestion. I've installed the plugin and it is mostly working. Right now the only problem I have is the need to refresh the Web UI in order to get the red banner when a connection failed. It takes about 15 seconds before the banner appears if you constantly refresh. I tried two browsers and ...

Thanks for the help. Right now, it seems like the sending a "probe" message with a script is probably the most straightforward approach -- it's a good suggestion. I've also posted a question on the Mosquitto forum to see if, by chance, they log any connection failure which could be put on a "bad ...

Thanks for looking further into this, those references are great.
Everything makes sense now. I'll have to think about the best way to proceed.

--Len

Thanks to all for quick replies. I do understand that I could modify the Tasmota code and add/or add a script in Domoticz to get behavior close to what I want. However, I'm a bit perplexed that the behavior I want isn't more directly available for the following reason: It seems like MQTT uses TCP/IP ...

Configuration: Domoticz on RPI 4 running RPI OS. Sonoff S31 plug flashed with Tasmota firmware Sonoff is plugged into mains and a lamp plugged into the Sonoff Two Hardware items: Dummy for switches Mosquitto – MQTT Client Gateway with Lan Interface Virutal switch (on/off) for Sonoff shows correctly o ...