The Network UPS Tools repository. UPS management protocol Informational RFC 9271 published by IETF at https://www.rfc-editor.org/info/rfc9271 Please star NUT on GitHub, this helps with sponsorships!
There are a few USB UPS devices that are not HID devices. These
devices typically implement some version of the manufacturer's serial
protocol over USB (which is a really dumb idea, by the way). An
example is the Tripplite USB. Such devices are not supported by the
usbhid-ups driver, and are not covered in this document. If you need to
add support for such a device, read new-drivers.txt and see the
tripplite_usb driver for inspiration.
Update for PID !=
0001
.