Check for offline or missing sensor

@DrSpaldo wrote:

I was wondering if anyone had a good way check or create a sensor that checks if one of my sensors is online.

For some reason when my solar sensor (current power) is offline the whole sensor goes away rather than having a nil reading. I have searched a bit on the forums however cannot find one that is for this scenario. Most are checking if nil readings, rather than the actual sensor itself being missing.

Thanks

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