[Nut-upsuser] usbhid-ups not loading with Arduino Leonardo on Ubuntu 23.10

[Kelly Byrd]

>  VID 2341 doesn't show up in the NUT Git source tree.
I was curious about this so just searched for Arduino and then 2341. I
found a few hits, but the interesting one was  in nut/drivers
/arduino-hid.c

I don't know enough about the project to know what a "subdriver" (that's
what the comments says) is, but it looks to me like there's at least some
people that have thought about Arduino support since 2021.

Is it possible I need to compile NUT myself instead of using the Ubuntu
package?


On Sun, Oct 29, 2023 at 6:46 PM Charles Lepple <clepple at gmail.com> wrote:

> > On Oct 29, 2023, at 9:25 PM, Kelly Byrd <kbyrd at memcpy.com> wrote:
> >
> > I have seen reports of folks claiming this just worked for them out of
> the box,
>
> Here you're referring to just making things work on Windows or macOS,
> right? I don't think it will be quite as simple with NUT, mostly because
> the NUT drivers are trying to expose all of the variables and commands,
> rather than just the simple shutdown bits.
>
> I'm not sure where a generic HID PDC driver sits in the priority list at
> the moment, but IIRC the current driver is still fairly tightly coupled to
> the USB VID and resulting model-specific mappings. So once you get the
> permissions worked out, you would still need a new source file that maps
> the HID Usage "paths" to NUT variable names. It's one of those things that
> in hindsight, it would have been great to fall back to a generic mapping
> that just looks at the OB and LB bits, but real-world UPSes are messy, and
> we would have needed those model-specific mappings to be able to
> distinguish things like input and output voltage.
>
> That said, if you change the VID/PID to something supported already,
> things just might work. The "Couldn't retrieve descriptors" is likely a
> result of the driver dropping root privileges, then not having enough
> permissions to write to the /dev/bus/usb node to request the HID
> descriptor. I don't know how your VID/PID got into the udev rules file -
> VID 2341 doesn't show up in the NUT Git source tree.
>
> --
> Charles Lepple
> clepple at gmail
>
>
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