I thought I had understood that the Tempest has a bit of memory so that when it looses connection with the hub, it can still collect data and sent it when it comes online again. Is this true? This morning I woke up to two mails (and two notifications on the phone) that the Tempest was offline and that it came online again. Not seen that before, well, maybe once but it’s not a regular thing.
Thankfully I had recently updated my weewx driver to register RSSI values. The graph looks like this:
(Curious that the wifi signal seems to get much more stable while the station is unreachable)
The mail that it got offline is from 1:30. The station seems to get offline 0:25-ish (5 minute resolution in my weewx-db and the timestamp is from the last reading, so that must have been 0:20-0:25) and that corresponds to the last reading I find in the Tempest app, which is 0:21. I suppose the mail comes an hour-ish after it goes offline.
The mail that it got back online is from 7:40 and that corresponds with my weewx-data which puts it between 7:40 and 7:45. The Tempest app has data from 7:27.
As you can see on the graph, there are also a few problems just before the main blackout, from 0:10-0:25. The Tempest app does not have this gap however, so I suppose that was filled back.
But does this mean this memory is only 15 minutes? That’s rather a lot shorter than I’d expect, to be honest
BTW the battery was fully loaded earlier that day so I’m pretty sure it didn’t go offline because of an empty battery.
And as you can see I placed my hub in a bit better position a bit after 21:00