[Nut-upsuser] Stopping dummy ups from broadcasting messages

[Roger Price]

On Fri, 16 Feb 2024, Dan Grostick wrote:

> [heartbeat]
>	driver=dummy-ups
>	port=heartbeat.conf
>	mode=dummy-once
>	desc= "Heart beat verfication of NUT"

I would be interesting to see the file heartbeat.conf and the NOTIFYFLAG 
declarations in upsmon.conf .

See also chapter 6.3 "Configuration file upsmon.conf for workstation with 
heartbeat" in https://rogerprice.org/NUT/ConfigExamples.A5.pdf

Roger