How to Catch Error (MQTT Disconnection) with Rules?

Hi everyone,

I want to create a "MQTTT Status" tile that shows if MQTTT is working or Down (and ideally last MQTTT connection but this is optional)

When MQTT is down, I get an event in logs Warn: mqtt isConnected false.

I have looked in the Rule Machine and cannot find the way to do it (though it's probably under my nose)

Any ideas on what is a good way to do it?