[Nut-upsuser] Synthesize low batt (LB) fron SNMP UPS which does not support this?

[Jim Klimov]

Makes sense, and a PR is a way to solicit feedback :)

I'd document this for ups.conf (man page and examples), including a note
that for devices which do provide a healthy LB these values may be set to 0
safely. Wondering if non-zero defaults should be there anyway. @Community,
WDYT?

Also, this critical-state check should be done only when the UPS is on
battery (and perhaps not calibrating), to avoid shutdowns as soon as we
start after an outage :) (In a similar fashion, enterprise UPSes are known
to raise an FSD to their subscribers, if manually powered on before
criticality thresholds are cleared, since they can't guarantee a safe
shutdown to keep data intact, if wall power gets lost again).

Thanks,
Jim


On Wed, May 17, 2023, 10:50 Carsten Aulbert <carsten.aulbert at aei.mpg.de>
wrote:

> Hi all,
>
> On 5/16/23 20:08, Carsten Aulbert wrote:
> > Idly browsing the client sources, I guess I could try to add our logic
> > here[1] and use [2] to gather the battery stats from our UPS and then
> > decide if this UPS is considered critical or not. But for this, I would
> > need to dust off/excavate my ancient poor C knowledge ;-).
> >
> > I guess I will give this a try unless someone has a brilliant idea and
> > could save my sanity.
>
> I've given it a try now and would like to get some feedback whether this
> is something worth considering as a PR or if this is too niche for master:
>
>
> https://github.com/networkupstools/nut/compare/master...carsten-AEI:nut:upsmon_low_bat_enhancement?expand=1
>
> Cheers
>
> Carsten
>
> --
> Dr. Carsten Aulbert, Max Planck Institute for Gravitational Physics,
> Callinstraße 38, 30167 Hannover, Germany, Phone +49 511 762 17185
> _______________________________________________
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