[Nut-upsuser] How to change shutdown notification threshold on Fortron UPS Champs (blazer_usb)?

[Pavel Hofman]

Roger, thanks a lot, your suggestions will fully solve my problem.

Best regards,

Pavel.

Dne 02. 09. 22 v 15:09 Roger Price napsal(a):
> On Fri, 2 Sep 2022, Pavel Hofman wrote:
> 
>>> blazer_usb reports:
>>>>> ups.model: WPHVT2K0
>>>>> ups.productid: 5161
> 
> Clearly a bug in blazer_usb
> 
>>> If battery.charge.low is not available, perhaps it is possible to get 
>>> the same effect by watching the voltage drop to a critical value.  
>>> This needs upssched and a custom upssched-cmd script.
>>
>> I see. IIUC since I basically want to "override" the LOWBATT event, 
>> not to react to it, I will have to periodically parse upsc output and 
>> check for the current battery.voltage level when OB. It means 
>> basically doing all the work ups-monitor actually does, but with a 
>> different threshold (which I do not see how to change in ups-monitor). 
>> Do I assume correctly I cannot force/script ups-monitor to do that for 
>> me since it already has all the parsed data available?
>>
>> Can I at least call some ups-monitor feature to start the controlled 
>> shutdown on all the NUTS networked clients?
> 
> A lot of what you need is in chapter 7 of 
> https://rogerprice.org/NUT/ConfigExamples.A5.pdf . Ignore all the stuff 
> about heartbeat and timers.  The EXEC on lines 380 and 381 of 
> upsmon.conf in figure 54 will get you to line 398 in upssched.conf in 
> figure 56.
> 
> At line 398, remove the lines "warning-timer" and "failure-timer", and 
> add a line such as
> 
>    AT ONBATT <myups> EXECUTE watch-battery-charge
> 
> Change line 425 in upssched-cmd to VOLTAGE=$( upsc $UPS battery.voltage 
> ) You may need to ensure that $VOLTAGE is an integer.
> 
> At line 428 in upssched-cmd replace the sections (heart-failure-timer), 
> (two-minute-warning-timer) and (one-minute-warning-timer) with something 
> like
> 
>    (watch-battery-charge)
>       # Compare the $VOLTAGE with say 48 (Bash insists on integers)
>       if [[ $VOLTAGE > 48 ]]; then continue;
>       else MSG="Power failure shutdown: Calling upsmon -c fsd, $CHMSG"
>            /usr/sbin/upsmon -c fsd
>       fi ;;
> 
> Roger
> 
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