Thanks for the response, but this is a different situation. In my case, the
device actually _is_ disconnected (I disconnected the USB cable and shut down
the UPS prior to replacing the batteries). This is not the only UPS, and it's
not even the primary one for this host, so I do not want to stop nut.target.
Restarting nut.target is not going to help unless I first edit the ups.conf,
upsmon.conf, and hosts.conf files to remove references to the now disconnected
unit, though now that I think of it, perhaps if the device is missing right
from the start, then the package won't keep trying forever to look for it. I'll
give that a try some time.
--
Bob Nichols AT comcast.net I am "RNichols42"
On 7/23/26 09:57, Raymond Burkholder wrote:
I wrote up an article regarding this.
NUT USB APC BeagleBone
<https://blog.raymond.burkholder.net/index.php?/archives/1360-NUT-USB-APC-BeagleBone.html>
For some reason, USB devices 'disconnect' and reconnect. When the device
reconnects, a new DeviceID is assigned to the USB device. This breaks the
usbhid-ups drivers supplied by NUT the packages. That is, usbhid-ups no longer
sees the APC USB device.
To resolve this, I used Debian's udev system to sense the device id change and
to restart the NUT USB driver.
# cat /etc/udev/rules.d/89-usb-ups-change.rules
SUBSYSTEM=="usb", MODE="0660", ACTION=="add", ENV{ID_VENDOR_ID}=="051d",
ENV{ID_MODEL_ID}=="0003", RUN+="/home/debian/usb_add.sh add '$env{DEVNAME}' '$env{ID_USB_SERIAL}'"
SUBSYSTEM=="usb", MODE="0660", ACTION=="remove",
RUN+="/home/debian/usb_remove.sh remove $env{DEVNAME}"
Sense a removal, which stops nut.target
$ cat usb_remove.sh
#!/usr/bin/env bash
logger "USB state change detected: $1 $2"
echo "$(date) USB state change detected: $1 $2" >> /home/debian/usb-log.txt
#systemctl stop nut.target
exit 0
Sense an addition, which restarts / starts
$ cat usb_add.sh
#!/usr/bin/env bash
logger "USB state change detected: $1 $2 $3"
echo "$(date) USB state change detected: $1 $2 $3" >>
/home/debian/usb-log.txt
systemctl restart nut.target
exit 0
--
Bob Nichols "NOSPAM" is really part of my email address.
Do NOT delete it.
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