[Nut-upsuser] NUT - Driver looks well, but connection from from client is lost or unavailable

Janez Kremzer janez256 at gmail.com
Wed Dec 24 07:51:41 UTC 2014

Thanks a lot Charels.

I just comment root user in usb.conf and add sudo adduser nut dialout.
Now everything works well.

Thanks again you save me a lot of time :)

I wish all of you merry chrismas,


2014-12-23 23:58 GMT+01:00 Charles Lepple <clepple at gmail.com>:

> I setup apcsmart driver on port /dev/ttyUSB0 in ups.conf and check that
> runing user=root.
> user=root is only for testing- this may cause other permissions problems
> later.
> It looks like the simplest way to handle this on Debian is to add the
> system 'nut' user to the 'dialout' group:
> $ sudo adduser nut dialout
> I have been meaning to collect some information on using serial UPSes with
> NUT via USB-to-serial converters, but you can adapt the udev rules to match
> your converter, and even create a symlink so that it will not change names.
> (If a process has /dev/ttyUSB0 open, and the USB cable is unplugged, udev
> will create /dev/ttyUSB1 when it is next plugged in, which will not match
> the configuration file)
> Just confirmed that the default udev rules for Raspbian wheezy will create
> some symlinks in /dev/serial/by-path and /dev/serial/by-id which should be
> useful.
> I have an inexpensive USB-to-serial cable which does not have a unique
> serial number, so I can only use one of that model at a time, and still
> uniquely identify it. But this is what it produces:
> $ ls -l /dev/serial/by-id/
> total 0
> lrwxrwxrwx 1 root root 13 Dec 31  1969
> usb-Prolific_Technology_Inc._USB-Serial_Controller-if00-port0 ->
> ../../ttyUSB0
> Although it is unwieldy, the pathnames under /dev/serial/by-id should
> always point to the correct /dev/ttyUSB? node.
> --
> Charles Lepple
> clepple at gmail
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