Connection problem with WMR89

[willefg]

Hi,

I had Weewx 3.9.2 running on a Raspberrypi for some time without any issues (that I couldn't resolve). Until now, that is. After a power outage the WMR89 is no longer recognized. Weewx Status command reports following

● weewx.service - LSB: weewx weather system
   Loaded: loaded (/etc/init.d/weewx; generated; vendor preset: enabled)
   Active: active (exited) since Tue 2020-01-21 17:58:59 CET; 28min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 574 ExecStop=/etc/init.d/weewx stop (code=exited, status=0/SUCCESS)
  Process: 629 ExecStart=/etc/init.d/weewx start (code=exited, status=0/SUCCESS)
   CGroup: /system.slice/weewx.service

jan 21 17:58:59 raspberrypi systemd[1]: Started LSB: weewx weather system.
jan 21 17:58:59 raspberrypi weewx[644]: engine: Using configuration file /etc/weewx/weewx.conf
jan 21 17:58:59 raspberrypi weewx[644]: engine: Debug is 3
jan 21 17:58:59 raspberrypi weewx[644]: engine: Initializing engine
jan 21 17:58:59 raspberrypi weewx[644]: engine: Loading station type WMR89 (weewx.drivers.wmr89)
jan 21 17:58:59 raspberrypi weewx[644]: wmr89: driver version is 0.1.1
jan 21 17:58:59 raspberrypi weewx[644]: wmr89: sensor map is {'yesterdayRain': 'rain_yesterday', 'extraTemp8': 'temperature_8', 'outHumidity': 'humidity_out', 'extraHum
jan 21 17:58:59 raspberrypi weewx[644]: engine: Import of driver failed: [Errno 2] could not open port /dev/ttyUSB0: [Errno 2] Bestand of map bestaat niet: '/dev/ttyUSB
jan 21 17:58:59 raspberrypi weewx[644]: engine: Unable to load driver: [Errno 2] could not open port /dev/ttyUSB0: [Errno 2] Bestand of map bestaat niet: '/dev/ttyUSB0'
jan 21 17:58:59 raspberrypi weewx[644]:     ****  Exiting...

I only have the WMR89 connected to the RPi, no other USB devices.

Please point me in the right direction.

Thanks.

[Thomas Keffer]

I'm not familiar with this driver (it's not part of WeeWX), but if it behaves like other serial drivers, it's possible that the operating system changed ports on you. That's pretty common when a device experiences a power failure. You need to make sure that WMR89 is on the port you think it is on.

Try stopping WeeWX, then unplugging the WMR89, then plugging it back in. Run the command 'dmesg'. It will tell you which port the kernel used when mounting the device. That's the one you want.

-tk

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[John Smith]

I used to have problems with different usb/serial ports jumping about on boot up. I solved this by using the symlinks in /dev/serial/by-id/