I see in the Davis trouble shooting guide
(https://github.com/weewx/weewx/wiki/Troubleshooting-the-Davis-Vantage-station#corrupt-station-memory)
mention of clock skew, which is what happened above. I just found a new way
of doing an old trick!
On Monday, November 16, 2020 at 8:15:19 PM UTC-8 John S wrote:
>
> Just a warning if you are considering putting a Pi online with an existing
> weewx system, it might not end well if there is competition for the dataset.
>
> I have a Davis Vantage Pro 2 and I have been using an Ubuntu system to run
> weewx 4.2.0 via a Davis ethernet data interface. Reading in the weewx docs
> that running weewx along with other stuff on a PC can be problematic, and
> because my install is problematic, I decided to try getting a Pi 3 B up and
> running weewx.
>
> I went through the system install and configuration so weewx would run and
> update the mariadb on the Pi. If the Pi was able to update the db
> correctly, I figured that's half the battle.
>
> I glossed over the warnings about time on the Pi and didn't notice that
> the Pi was off by two hours vs my linux box.
>
> ... until I started getting this in my log:
> Nov 16 12:45:28 weewx[37812] WARNING weewx.engine: Ignore historical
> record: {'windGust': 11.0, 'barometer': 30.083, 'lowOutTemp': 61.2,
> 'outHumidity': 61.0, 'interval': 15, 'forecastRule': 44, 'rain': 0.0,
> 'dateTime': 1605560400, ... 'windGustDir': 135.0}
>
> Due to this, the old weewx on linux wasn't happy and wasn't updating
> interval data, it was in the error state and not able to reset.
>
> I shut down the Pi but that didn't fix the issue so rebooted linux machine
> and that seemed to bring things back into sync, weewx is running and
> updating as before.\
>
> I thought I'd share the fact that two instances of weewx hitting the same
> source hardware did cause things to lose their sync. I've nothing other
> than the log to point to the weewx driver setting the clock so if you have
> two systems with differing times, only one will win the prize.
>
> So, it appears that you can bring a Pi online to run weewx, just don't
> expect it to share the hardware nicely.
>
>
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