Hello everyone!
I am trying to make an "IamAlive" monitor in which my arduino device publishes an "OK" message every 30 seconds in a mqtt topic and every time it is published, the day and time is indicated in a graph on the Dashboard node. I would also like to make a led for when I no longer send the message to the topic, the led would turn red, but I'm not able to do it, I thought of some ways but it doesn't work.
Would anyone have an idea how I could do this?
The flow
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