I have, just like many of us, several RPi's scattered around. Some are placed outdoor, indoor, in the ground and up in the attic. In total I counted to 10, crazy, really tried to re-think, well some got eventually be merged but I need at least 8. So, decided to keep it as is.
I really wanted to check if they all are working in an acceptable environment. Up here in the North the seasonal conditions can vary a bit, from cold winter to hot summer, especially in our attic
So I decided to throw some simple stuff together. In each RPi I have this little minimalistic flow (in addition to all the many other flows), reporting the CPU temperature every minute via MQTT. Please note, for each RPi I set a unique topic (basically the RPi name or main function)
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Next is to collect & present all those MQTT messages. I decided to make a simple GUI view using the dashboard. It will definitely not win a beauty contest but it serves it's purpose. Please note you have to edit the switch node fitting the topic names you used earlier in each RPi
This is how it looks like when monitoring my 10 RPi's
This is the flow:
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