Fedora System.d setup w/ recovery

[Mark Jenks]

Thought I would share my system.d setup.   I've been running weewx for years now, but I recently extended my USB with a USB extended 40ft away from where it was.
Since then, once in a great while, the USB driver would fail and take weewx down with it. Then I had to reboot it the server (if remote) or unplug/replug the USB cable.

I did some investigating on self healing, and system.d can actually heal it when it happens using OnFailure.  It starts another system.d that runs one time, fixes it, and then starts weewx.

The hex for "usb_modeswitch -v 0x10c4 -p 0xea60" can be found when you do lsusb.  Using the hex, it will find it even if it changes ttys0/1/2.

Here is my Config. Enjoy!

-Mark

# cat /usr/lib/systemd/system/weewx.service
# systemd service configuration file for WeeWX

[Unit]
Description=WeeWX
Documentation=https://weewx.com/docs
Requires=time-sync.target
After=time-sync.target
Wants=network-online.target
After=network-online.target
OnFailure=weewx-resetusb.service

[Service]
ExecStart=weewxd /etc/weewx/weewx.conf
Restart=on-failure
StandardOutput=null
StandardError=journal+console
RuntimeDirectory=weewx
RuntimeDirectoryMode=775
User=weewx
Group=weewx

[Install]
WantedBy=multi-user.target

-------------------------------------------------------

# cat /usr/lib/systemd/system/weewx-resetusb.service
# systemd service configuration file for WeeWX

[Unit]
Description=WeeWX reset USB

[Service]
Type=oneshot
ExecStart=/usr/local/bin/restart-vue-usb.sh

[Install]
WantedBy=multi-user.target

-----------------------------------------------------------

# cat /usr/local/bin/restart-vue-usb.sh
#!/bin/sh
/usr/sbin/usb_modeswitch -v 0x10c4 -p 0xea60 --reset-usb
echo "system.d restarted weewx USB." | s-nail -s "Restarted USB" -r x...@xxx.net x...@xxx.net