I don't see it in the little log excerpt that you included, but double
check that you don't have two instances of weewxd running. If that's not
the case, set debug=1, restart weewx, let it run for a couple of reporting
cycles, then post the log.

On Mon, Aug 26, 2024 at 3:45 PM Marty T <[email protected]> wrote:

> I've had weewx running on my RaspberryPi for ages with no issues.
> Connected to a Davis Weather Envoy via USB.
>
> We had a power failure Saturday night and ever since then, weewx has not
> been able to communicate with the Davis unit.
>
> Standard CRC messages in the log:
>
> Aug 26 17:27:38 wxman weewxd[2609]: ERROR weewx.drivers.vantage: Unable to
> pass CRC16 check while sending data to Vantage console
> Aug 26 17:27:38 wxman weewxd[2609]: ERROR weewx.drivers.vantage: DMPAFT
> try #1; error: Unable to pass CRC16 check while sending data to Vantage
> console
> Aug 26 17:27:50 wxman weewxd[2609]: ERROR weewx.drivers.vantage: Unable to
> pass CRC16 check while sending data to Vantage console
> Aug 26 17:27:50 wxman weewxd[2609]: ERROR weewx.drivers.vantage: DMPAFT
> try #2; error: Unable to pass CRC16 check while sending data to Vantage
> console
> Aug 26 17:28:03 wxman weewxd[2609]: ERROR weewx.drivers.vantage: Unable to
> pass CRC16 check while sending data to Vantage console
> Aug 26 17:28:03 wxman weewxd[2609]: ERROR weewx.drivers.vantage: DMPAFT
> try #3; error: Unable to pass CRC16 check while sending data to Vantage
> console
> Aug 26 17:28:15 wxman weewxd[2609]: ERROR weewx.drivers.vantage: Unable to
> pass CRC16 check while sending data to Vantage console
> Aug 26 17:28:15 wxman weewxd[2609]: ERROR weewx.drivers.vantage: DMPAFT
> try #4; error: Unable to pass CRC16 check while sending data to Vantage
> console
> Aug 26 17:28:15 wxman weewxd[2609]: ERROR weewx.drivers.vantage: DMPAFT
> max tries (4) exceeded.
>
> I installed the (awful) WeatherLink software on my Windows PC and
> connected the Davis Weather Envoy and it immediately connected and
> downloaded about 500 data packets. So the issue doesn't seem to be with the
> Davis unit.
>
> I upgraded to the latest weewx, rebooted the RPi, still no joy.
>
> Any ideas why it would suddenly start failing after many months of
> flawless operation?
>
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