[Nut-upsuser] Dummy-ups cycles between online and onbatt every 5 minutes. (Nut 2.8.0)

[Roger Price]

On Fri, 16 Jun 2023, Dan Grostick via Nut-upsuser wrote:

> Now that upsstats.cgi works, I've noticed that dummy-ups changes state every 5 
> minutes between OL and OB (probably when the 300 second timer expires). The 
> UPS state stays online.

This is a part of the heartbeat intended to assure that communication between 
upsd and upsmon is effective.  No UPS is involved.  Every 600 seconds an 11 
minute timer is reset before it runs out.  If it were to run out, the 
installation is broken. See https://rogerprice.org/NUT/ConfigExamples.A5.pdf for 
gory detail.

> Also "online" and "onbatt" are broadcast to the console probably via WALL.

The heartbeat doesn't need this.  It's just noise.

> (The state changes don't seem to be form the ups as upsshed-cmd doesn't run). 

Normal.  The heartbeat doesn't involve any specific UPS.

> Upssched-cmd does run when the UPS is actually unplugged and plugged back in.

That's because a real UPS in involved.

Roger