Detecting power is restored via MQTT

General
1

Good morning,
I'd like to detect when power is restored to devices (using MQTT).
My node-red and MQTT servers are on a battery backup.
Any ideas other than watch for LWT messages?

Thanks,
Jay

2

LWT is the way to do it.

3

To add to Colin's suggestion, you might want to try using the extended features of MQTT v5 since it gives you more options if you want to use them.

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4

Not sure which version of Mosquito I have, but I'll check.
Thanks

5

Does the basic LWT functionality not do what you want?