Weewx expects the rain amount added since the last 'loop' record but *my guess* is that the weather station is providing the volume of rain since some reset time (midnight?). Therefore the driver is remembering the last volume the station provided and subtracts that from the latest volume to pass on the difference to weewx. (This is how my driver - not the one you are using - handles this.)
Further I'm guessing that the driver will try to match the weather stations reset time. As the problem starts just after midnight, it could well be that there is a difference in the times that the weather station sets the rain volume for the day back to zero and when the driver tries to do the same. If the driver has a certain value from just before midnight; the weather station resets to zero but the driver does not; the next rain volume seen by the driver will be loer than the last one it has recorded and so will pass on a negative 'increment'. I would check that both the weather station and the system running weewx have the same time and therefore record the 'midnight reset' together. (This is all wild supposition on my part - please treat it as such!) Susan On Thursday, 27 May 2021 at 5:49:45 am UTC+10 kk44...@gmail.com wrote: > First I realized, that rainRate > 0 but rain == 0. And it was raining. So > I looked into it. > > weewx.conf says: > > [Station] > > ... > > station_type = WeatherLinkLiveUDP > > [WeatherLinkLiveUDP] > > wll_ip = XXX.XXX.XXX.XXX > > poll_interval = 10 > > driver = user.weatherlinkliveudp > > hardware = Davis Vantage Pro2 > Before midnight, no error is logged into syslog. All is normal. Starting > with 00:00:05 today WeeWX complains to syslog about a negative rain value: > > May 26 00:00:05 LokalWiki weewx[365882] WARNING weewx.qc: 2021-05-26 > 00:00:06 CEST (1621980006) LOOP value 'rain' -0.14960629921259844 outside > limits (0.0, 10.0) > This message is repeated for *every loop packet*. The value increases > during the day a little bit. > > May 26 21:05:50 LokalWiki weewx[365882] WARNING weewx.qc: 2021-05-26 > 21:05:50 CEST (1622055950) LOOP value 'rain' -0.015748031496062992 outside > limits (0.0, 10.0) > When I realized all that, I stopped WeeWX and started it again. No more > messages from that moment on. And rain is registered again as normal. > > Reading weewx.sdb results in: > > sqlite> select dateTime,rain,rainRate from archive where > dateTime>=1621980000 order by 1; > > 1621980000|0.0|0.0 > > 1621980300|0.149606299212598|0.0 > > 1621980600|0.0|0.0 > ... > > 1621980300 == 26.05.2021 00:05:00 CEST, which is the time, when the > messages started. For all other timestamps up to the restart rain is 0.0 > > Can someone draw sense out of that? > > > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/79efaefa-6ac6-4f52-a8e9-6a5b8e4482fan%40googlegroups.com.
