[Nut-upsuser] nut on armhf, r-pi4b IOW

Gene Heskett gheskett at shentel.net
Sat Jan 11 23:43:23 GMT 2020

On Saturday 11 January 2020 17:00:19 Charles Lepple wrote:

> On Jan 11, 2020, at 3:50 PM, Gene Heskett wrote:
> >> The problem is further downstream. Even after you map HID names to
> >> NUT names, then you run into the fact that CPS and NUT are
> >> interpreting the HID Report Descriptor differently. (Some details
> >> here: https://github.com/networkupstools/nut/issues/439 )
> >
> > Thats asking quite a bit of you. IMO TANSTAAFL applies here, just
> > like anyplace else.
> To be fair, glancing at one specific debug log is a lot easier than
> fixing code that has to run on equipment that I've never seen before
> :-)
> > Perhaps a confirmation of the clamp to zero for low loads might be
> > this snippet from "strace upsc myups":
> >
> > newselect(4, [3], NULL, NULL, {tv_sec=5, tv_usec=0}) = 1 (in [3],
> > left {tv_sec=4, tv_usec=999990})
> > read(3, "s ups.load \"0\"\nVAR myups ups.mfr"..., 64) = 64
> > write(1, "ups.load: 0\n", 12ups.load: 0
> > )           = 12
> >
> > where it apparently reads 64, but reports an 0, which is probably
> > pretty miniscule in the grand scheme of things if that is a 3 byte
> > value that it reads.
> The parameters to read() are the file descriptor, a buffer, and a
> length, so the "3" is the file descriptor (comes from the read set in
> newselect(): [3]), and 64 is the length of the string that includes
> "VAR".
> However, cps-hid.c is in the usbhid-ups driver, which is sending the
> VAR data to upsd. I was recommending that you grab the debug log from
> the driver, before it has had a chance to convert any of the raw HID
> bytes to numbers.

The command line in that file is duff. Quote:
In preparation for writing a subdriver for a device that is currently
unsupported, run usbhid-ups with the following command line:

 drivers/usbhid-ups -DD -u root -x explore -x vendorid=XXXX auto

(substitute your device's 4-digit VendorID instead of "XXXX").
I tried 0501 and 0764, same return.

drivers/usbhid-ups -DDD -u root -x explore -x vendorid=0501 auto 
>& /tmp/info

 Instant return, logging this:
   0.000000     Error: too many non-option arguments. Try -h for help.
Network UPS Tools - Generic HID driver 0.41 (2.7.4)
USB communication driver 0.33


Cheers, Gene Heskett
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>

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