Can we post timestamp with each message?

Would help with use as presence detection to record last seen

Would it be different than the timestamp of the message reception?

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Timestamp of message reception doesn’t get parsed by openhab mqtt broker so it’s a very convoluted process to create an item out of it

I just use a simple now call in openHAB whenever I need a timestamp for received MQTT messages.

Not that convoluted to me, but then again I don’t know exactly how and for what you’d want to use it.