[Nut-upsuser] nutdrv_qx hangs after send: QS

Richard Flint richard.flint at gmail.com
Wed Apr 8 23:10:05 UTC 2015


Thanks for all the help. I have a spare pcengines ALIX box lying around and
I am going to repurpose that as a dedicated UPS monitoring system.


On Mon, Apr 6, 2015 at 2:27 PM Charles Lepple <clepple at gmail.com> wrote:

> On Apr 6, 2015, at 8:46 AM, Richard Flint <richard.flint at gmail.com> wrote:
> Unfortunately this approach isn't going to work.
> I've done some further research and it would appear that it is the
> underlying ugen device and not libusb that is failing to honor the timeout.
> https://mail-index.netbsd.org/tech-misc/2006/03/17/0000.html
> The person above worked around this by having the device opened in non
> blocking mode using the O_NONBLOCK flag but this required changing libusb.
> Unfortunately, the ugen drivers in Solaris, NetBSD, FreeBSD, etc. are
> similarly named, but not necessarily the same code. At least with the
> *BSDs, you can inspect the code to see what has changed (and the BSD USB
> support has improved significantly across the board since 2006 when that
> message was posted).
> OpenUSB seems to work around the blocking issue by creating a separate
> timeout thread, so I still think there is some hope there.
> On the other hand, if that doesn't work, I would consider setting up
> another system dedicated to monitoring the UPS, and setup NUT on Solaris to
> be a client to the other system. Linux on x86_64 is probably the best
> supported OS for NUT and a USB UPS, but others have had success with
> embedded ARM and MIPS Linux systems. I have a Soekris net5501 running
> FreeBSD monitoring the USB UPS in my home "data center" in the basement,
> and it has been very reliable: http://soekris.com/products/net5501.html (also
> available in a rack-mount form factor; I have no connection to Soekris
> other than using their equipment)
> --
> Charles Lepple
> clepple at gmail
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