On Wed, 24 Dec 2025 12:02:15 +0100
Jim Klimov <jimklimov+nut at gmail.com> wrote:> > I'm having problems with one of my UPS (BEST MD500), the upsd has
> > stale data, we get a power hit and upsmon give the following
> > message:
> >
> > upsmon[918]: UPS [UPS1 at localhost] was last known to be not fully
> > online and currently is not communicating, assuming dead
> >
> > upsmon starts a shutdown and then upsd gives a data is no longer
> > stale, but the shutdown still happens. Or a way to have upsmon
> > wait awhile before starting the shutdown?
> >
> > Is there someway to stop the shutdown when this happens? I'm
still
> > debugging why the driver is loosing communication with the UPS.
> > --
> > Michael
> > _______________________________________________
> > Nut-upsuser mailing list
> > Nut-upsuser at alioth-lists.debian.net
> > https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser
> >
> Cheers, and happy holidays.
>
> I am not sure your logs here show the whole picture. For upsmon to
> behave this way, thee must have been a power event and the driver
> told the data server the UPS is on battery. Pollfreq increases too
> (time delay decreases). If the UPS connection gets lost then, this is
> deemed immediately critical as we don't know how long the system can
> be up. Maybe battery is old and does not fit its spec or latest
> calibration. So we issue FSD to save as much as we can ASAP.
>
> Need to check in code if there are now any throttle toggles for
> this.
>
> And then if shutdown did begin, generally the only way to bring the
> system back up consistently is to reboot it one way or another. Your
> custom SHUTDOWNCMD implementation may do whatever fits your case
> though.
>
> Hope this helps,
> Jim Klimov
>
>
> On Tue, Dec 23, 2025, 21:54 Michael Hughes via Nut-upsuser <
> nut-upsuser at alioth-lists.debian.net> wrote:
>
Jim,
Yes, there was a power outage message before the lost communication.
I had thought about changing the poll interval since the communication
is done through RS-232.
--
Michael
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