I started to get NULL values in realtime.txt (using crt plugin)
Davis Vantage Pro2 nad Davis Vue wireless
Raspberry Pi, USB - serial link
Weewx 4.4.0
Same config and setup have been working since end of January

Any idea what is cuasing this 

Feb 19 16:34:17 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.engine.StdReport
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.engine.StdReport
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] INFO __main__: Starting up 
weewx version 4.4.0
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] DEBUG weewx.drivers.vantage: 
Gentle wake up of console successful
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] INFO weewx.engine: Clock 
error is -0.13 seconds (positive is fast)
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] INFO weewx.engine: Using 
binding 'wx_binding' to database 'weewx.sdb'
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] INFO weewx.manager: Starting 
backfill of daily summaries
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] INFO weewx.manager: Daily 
summaries up to date
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] DEBUG weewx.drivers.vantage: 
Getting archive packets since 2021-02-19 16:32:00 CET (1613748720)
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] DEBUG weewx.drivers.vantage: 
Gentle wake up of console successful
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] DEBUG weewx.drivers.vantage: 
Retrieving 1 page(s); starting index= 3
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] INFO weewx.manager: Added 
record 2021-02-19 16:33:00 CET (1613748780) to database 'weewx.sdb'
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] INFO weewx.manager: Added 
record 2021-02-19 16:33:00 CET (1613748780) to daily summary in 'weewx.sdb'
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] INFO weewx.manager: Added 
record 2021-02-19 16:34:00 CET (1613748840) to database 'weewx.sdb'
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] INFO weewx.manager: Added 
record 2021-02-19 16:34:00 CET (1613748840) to daily summary in 'weewx.sdb'
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] INFO weewx.engine: Starting 
main packet loop.
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] DEBUG weewx.drivers.vantage: 
Gentle wake up of console successful
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] DEBUG weewx.drivers.vantage: 
Requesting 200 LOOP packets.
Feb 19 16:34:17 aad-raspberry-01 weewx[21406] DEBUG weewx.drivers.vantage: 
Gentle wake up of console successful
Feb 19 16:34:22 aad-raspberry-01 weewx[21406] ERROR weewx.drivers.vantage: 
LOOP try #1; error: Expected to read 99 chars; got 0 instead
Feb 19 16:34:26 aad-raspberry-01 weewx[21406] ERROR weewx.drivers.vantage: 
LOOP try #2; error: Expected to read 99 chars; got 0 instead
Feb 19 16:34:30 aad-raspberry-01 weewx[21406] ERROR weewx.drivers.vantage: 
LOOP try #3; error: Expected to read 99 chars; got 0 instead
Feb 19 16:34:34 aad-raspberry-01 weewx[21406] ERROR weewx.drivers.vantage: 
LOOP try #4; error: Expected to read 99 chars; got 0 instead
Feb 19 16:34:34 aad-raspberry-01 weewx[21406] ERROR weewx.drivers.vantage: 
LOOP max tries (4) exceeded.
Feb 19 16:34:34 aad-raspberry-01 weewx[21406] INFO weewx.engine: Main loop 
exiting. Shutting engine down.
Feb 19 16:34:34 aad-raspberry-01 weewx[21406] CRITICAL __main__: Caught 
WeeWxIOError: Max tries exceeded while getting LOOP data.
Feb 19 16:34:34 aad-raspberry-01 weewx[21406] CRITICAL __main__: **** 
Waiting 60 seconds then retrying...
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO __main__: retrying...
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO __main__: Using 
configuration file /etc/weewx/weewx.conf
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO __main__: Debug is 1
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG __main__: Initializing 
engine
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO weewx.engine: Loading 
station type Vantage (weewx.drivers.vantage)
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.drivers.vantage: 
Driver version is 3.2.1
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.drivers.vantage: 
Option loop_request=1
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.drivers.vantage: 
Opened up serial port /dev/ttyUSB0; baud 19200; timeout 4.00
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.drivers.vantage: 
Gentle wake up of console successful
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.drivers.vantage: 
Hardware type is 16
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.drivers.vantage: 
ISS ID is 1
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.drivers.vantage: 
Hardware name: Vantage Pro2
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.engine.StdTimeSynch
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.engine.StdTimeSynch
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.engine.StdConvert
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO weewx.engine: StdConvert 
target unit is 0x1
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.engine.StdConvert
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.engine.StdCalibrate
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.engine.StdCalibrate
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.engine.StdQC
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.engine.StdQC
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.wxservices.StdWXCalculate
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.engine.StdQC
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.wxservices.StdWXCalculate
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.manager: Daily 
summary version is 4.0
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.wxservices.StdWXCalculate
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service user.crt.CumulusRealTime
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO user.crt: service 
version is 0.21
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO user.crt: realtime txt 
output goes to /home/weewx/realtime/realtime.txt
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO user.crt: 'None' values 
will be displayed as NULL
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO user.crt: zambretti 
forecast: False
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO user.crt: binding is loop
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service user.crt.CumulusRealTime
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.wxxtypes.StdWXXTypes
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.wxxtypes.StdWXXTypes
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.wxxtypes.StdPressureCooker
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.wxxtypes.StdPressureCooker
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.wxxtypes.StdRainRater
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.wxxtypes.StdRainRater
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.wxxtypes.StdDelta
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.wxxtypes.StdDelta
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.engine.StdArchive
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO weewx.engine: Archive 
will use data binding wx_binding
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO weewx.engine: Record 
generation will be attempted in 'hardware'
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] ERROR weewx.engine: The 
archive interval in the configuration file (300) does not match the station 
hardware interval (60).
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO weewx.engine: Using 
archive interval of 60 seconds (specified by hardware)
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Use LOOP 
data in hi/low calculations: 1
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.engine.StdArchive
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.restx.StdStationRegistry
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO weewx.restx: 
StationRegistry: Registration not requested.
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.restx.StdStationRegistry
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.restx.StdWunderground
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO weewx.restx: 
Wunderground: Posting not enabled.
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.restx.StdWunderground
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.restx.StdPWSweather
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO weewx.restx: PWSweather: 
Posting not enabled.
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.restx.StdPWSweather
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.restx.StdCWOP
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO weewx.restx: CWOP: 
Posting not enabled.
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.restx.StdCWOP
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.restx.StdWOW
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO weewx.restx: WOW: 
Posting not enabled.
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.restx.StdWOW
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.restx.StdAWEKAS
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO weewx.restx: AWEKAS: 
Posting not enabled.
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.restx.StdAWEKAS
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.engine.StdPrint
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.engine.StdPrint
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Loading 
service weewx.engine.StdReport
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] DEBUG weewx.engine: Finished 
loading service weewx.engine.StdReport
Feb 19 16:35:34 aad-raspberry-01 weewx[21406] INFO __main__: Starting up 
weewx version 4.4.0

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