[Nut-upsuser] Powering off the big stuff first

[Jim Klimov]

I think the client should be able to do that with `upssched` as long as the
`upsmon` calls it to trigger the events. Thinking of it, the common
use-case is indeed time (e.g. 5 minutes after on-battery, certain systems
begin their shutdown), or the primary upsmon telling others to FSD ASAP.

Maybe the other use-cases you mention would benefit from a PR - primarily
for `upsmon` configuration syntax and actual logic to do certain actions
based on certain data states (e.g. "we ticked to battery 9% and previous
reading was >= 10% - gotta call the SHUTDOWNCMD handler!", which could be
upssched to filter out floating glitches, or directly the shutdown
script...)

And as always, PRs are welcome ;)

Jim


On Sun, Jul 16, 2023 at 9:39 PM Arnaldo H Viegas de Lima <
arnaldo at viegasdelima.com> wrote:

> One thing that I think NUT misses is the client side being able to decide
> to shutdown by itself based on time (this can be done), battery charge (ex
> if bellow 10%), and estimated runtime left (if available and considered
> reliable/calibrated).
> Without having to sort on the LB state from the server.
>
> Sent from my iPhone with  iTypos
>
> On Jul 16, 2023, at 4:34 PM, Willcox David via Nut-upsuser <
> nut-upsuser at alioth-lists.debian.net> wrote:
>
> 
> Interesting. Something similar came up in late May. Look for "[Nut-upsuser]
> Synthesize low batt (LB) fron SNMP UPS which does not support this?” Is
> there an archive of this list? I an’t find it. I’d been trying to figure
> out how to do that itself, but then found some code in drivers/dstate.c
> that looked like it would work, but someone else replied that they’d
> tried it and it didn’t work.
>
> But that was about getting the NUT server to synthesize LB to its clients
> before the actual UPS did.
>
> If you’re running NUT as a client on your server, then yes, as others
> have noted, upssched on your server is probably the way to go.
>
>
> On Jul 16, 2023, at 9:00 AM, Dan Langille via Nut-upsuser <
> nut-upsuser at alioth-lists.debian.net> wrote:
>
> Hello,
>
> I had an idea last week: why shut everything off (in my basement) when the
> power goes off (and run time goes below X minutes)?
>
> My idea: shutdown the big stuff first (two servers) leaving the little
> stuff (switches, wireless, gateway) running for a while longer. I might get
> another 30 minutes of internet that way. Let me watch a bit more streaming….
>
> I’m convinced that idea is achievable with a little programming.
>
> Mind you, most of my power outages exceed 1 hour.
>
> Do you already do something similar? Do you have something you’d like to
> share please?
>
> Thank you
>
> --
>  Dan Langille
>  dan at langille.org
>
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