Nut upsuser - Jan 2015 - libusb drops connection to my Tripp Lite SMART500T1U

On Tue, Jan 6, 2015 at 9:46 PM, Charles Lepple <clepple at gmail.com>
wrote:
> However, for the notifications, you could use "upssched" to only
notify you if the UPS is disconnected for longer than the usual reconnection
time.
>
Hello Charles,

For my purposes, I will take an even easier route to resolution ... I
will just comment this line out of my upsmon.conf file.  Because I
guess I don't mind that it comes and goes.  I just don't want to be
notified about it.  ;-)

# NOTIFYFLAG NOCOMM

I would like to get to the root of the problem though.  I may tweak
the code a bit and see if I can get better results.  Although you are
right about the broken pipe.  If the device is "unplugging" ... not
much you can do to fix that other than to just ignore it.

Steve Ballantyne
Network Engineer
MCSE/MCDST; Novell CLA; LPIC-1; CTT+; A+; Network+; Linux+; Server+;
I-Net+; Security+; SonicWALL CSSA

On Jan 7, 2015, at 12:49 PM, Steve Ballantyne <steve.ballantyne at
gmail.com> wrote:
> I would like to get to the root of the problem though.  I may tweak
> the code a bit and see if I can get better results.  Although you are
> right about the broken pipe.  If the device is "unplugging" ...
not
> much you can do to fix that other than to just ignore it.
Although this tends to happen more with x86 systems and/or USB3, you might want
to see if the disconnects are less frequent with a shorter or higher-quality USB
cable.

-- 
Charles Lepple
clepple at gmail

On Thu, Jan 8, 2015 at 11:37 PM, Charles Lepple <clepple at gmail.com>
wrote:
> Although this tends to happen more with x86 systems and/or USB3, you might
want to see if the disconnects are less frequent with a shorter or
higher-quality USB cable.
The more I look into this ... the more I think that it's exclusively
Tripp-Lite weirdness!  There are some things that I explored as far as
this being a Raspberry Pi problem, or a Raspbian problem, or even a
Debian problem.  But any problems I could find out there have long
since been resolved with confirmed bug fixes.

I noticed there have been a few people over the years on the NUT list
that have other models of Tripp Lite and have had this same issue of
random disconnections.  So long as Tripp-Lite is not sharing their
code with us, I think this will remain a mystery.  At some point they
are going to *have* to either update their Linux binaries, or drop
them altogether.  The specific distributions that they support with
their proprietary software is loooong out of date.  Perhaps at that
point they will open source the code?

Also there seems to be some speculation (or perhaps you know for a
fact) that the Tripp Lite actually includes a serial to USB converter
inside of the device.  I have a stockpile of these awaiting
deployment.  Maybe I will open one and look inside.

Steve Ballantyne
Network Engineer
MCSE/MCDST; Novell CLA; LPIC-1; CTT+; A+; Network+; Linux+; Server+;
I-Net+; Security+; SonicWALL CSSA