A useful feature would be the timestamp of the last received message for a device (for data freshness checking).
It would also be useful to be able to persist this to a file that is restored on next run, so that a resumed program knows how long since the device was last heard from on recovery.
Split out from #63
A useful feature would be the timestamp of the last received message for a device (for data freshness checking).
It would also be useful to be able to persist this to a file that is restored on next run, so that a resumed program knows how long since the device was last heard from on recovery.