On Thursday, February 15, 2024 at 4:43:37 PM UTC-5 [email protected]
wrote:
Feb 15 21:37:15 weewx weewxd[103822]: CRITICAL weewx.engine: ****
File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 325, in
open
Feb 15 21:37:15 weewx weewxd[103822]: CRITICAL weewx.engine: ****
raise SerialException(msg.errno, "could not open port {}:
{}".format(self._port, msg))
Feb 15 21:37:15 weewx weewxd[103822]: CRITICAL weewx.engine: ****
serial.serialutil.SerialException: [Errno 13] could not open port
/dev/ttyUSB0: [Errno 13] Permission denied: '/dev/ttyUSB0'
Feb 15 21:37:15 weewx weewxd[103822]: CRITICAL __main__: Unable to load
driver: [Errno 13] could not open port /dev/ttyUSB0: [Errno 13] Permission
denied: '/dev/ttyUSB0'
Feb 15 21:37:15 weewx weewxd[103822]: CRITICAL __main__: ****
Exiting...
Feb 15 21:37:15 weewx systemd[1]: weewx.service: Main process exited,
code=exited, status=4/NOPERMISSION
Feb 15 21:37:15 weewx systemd[1]: weewx.service: Failed with result
'exit-code'.
Now unable to restart WeeWX and have rolled back to the previous version.
Any idea what the issue is?
the error indicates that the weewxd process does not have permission to
read/write the USB-to-serial device. make sure that the user running
weewxd has read/write permission to /dev/ttyUSB0 (which is probably a
USB-to-serial adapter).
for example, if user 'weewx' is running weewxd, then put the weewx user
into the dialout group then restart weewxd:
sudo usermod -aG dialout weewx
sudo systemctl restart weewx
see the section about reading/writing to devices in the wiki article "what
you need to know about permissions":
https://github.com/weewx/weewx/wiki/Understanding-permissions#readingwriting-data-to-a-device
please let us know what works for you. there are *so* many variations when
it comes to permissions, and many different ways to make things work.
we're still trying to simplify the documentation to make permissions easier
to understand and deal with.
m
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