[Nut-upsuser] UPS hotplug

[Jim Klimov]

Great to see you have solved this!

 Just for posterity: normally NUT server (upsd) won't start without any
devices configured. In master branch, an ALLOW_NO_DEVICE patch was added
some time ago to let upsd run always. So that should be in 2.7.5 eventually.

As part of that context, a service reload operation should tell the running
upsd to slurp new configuration and see newly added devices (without an
outage for ones it already serves). I wonder if it would also help with
such USB reconnections.

I think upsd ability to reconfigure could be in 2.7.4 already, not at a
computer now to check. Probably the systemd unit would need an ExecReload
line like one in master branch on github.

Jim Klimov

On Wed, Nov 17, 2021, 15:54 Maxence Rioblanc <maxence.rioblanc at ixblue.com>
wrote:

> Hi Bart,
>
> Thanks for the clue.
>
> I tried and managed to make it works by modifying the udev rule I was
> working with.
>
> Not sure if this is 100% correct but I can now recover my UPS when I
> hotplug it:
>
> /etc/udev/rules.d/ 90-nut-ups.rules
>
>
>
>
>
> # ECUS UPS
>
>
>
> ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="0001",
> ATTR{idProduct}=="0000", MODE="0664", GROUP="nut", RUN+="/usr/bin/systemctl
> restart nut-server.service"
>
>
>
>
>
> Best regards,
>
> Maxence
>
>
>
> *De :* Bart J. Smit <bart at smits.scot>
> *Envoyé :* mercredi 17 novembre 2021 13:45
> *À :* Maxence Rioblanc <maxence.rioblanc at ixblue.com>;
> nut-upsuser at alioth-lists.debian.net
> *Objet :* RE: UPS hotplug
>
>
>
> You can add a udev script to restart NUT when the UPS is plugged in
> https://wiki.debian.org/udev
>
>
>
> *From:* Nut-upsuser <
> nut-upsuser-bounces+bart=smits.co.uk at alioth-lists.debian.net> *On Behalf
> Of *Maxence Rioblanc
> *Sent:* 16 November 2021 11:55
> *To:* nut-upsuser at alioth-lists.debian.net
> *Subject:* [Nut-upsuser] UPS hotplug
>
>
>
> Hello,
>
>
>
> I’m using nut for few days and found it working perfectly fine in most
> conditions. However, there is one behavior I am not able to handle
> correctly:
>
> When I boot my computer (I am in a mode=standalone configuration) while my
> UPS is not connected and that I plug it (using USB cable) later, the driver
> doesn’t mount automatically, and I am not able to enable communication with
> my UPS.
>
> I need to restart nut-server.service to get communication established.
>
> Is there any way to make this hot plug works?
>
>
>
> My configuration:
>
>    - Debian 11
>    - NUT 2.7.4-13 installed from apt-get
>    - UPS: ECUS MRT_2_1000 running fine with blazer_usb driver
>    -
>
>
>
>
>
> Regards,
>
> Maxence
> _______________________________________________
> Nut-upsuser mailing list
> Nut-upsuser at alioth-lists.debian.net
> https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser
>
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