[Nut-upsdev] What is the arduino sub-driver intended to be used for?

Kelly Byrd kbyrd at memcpy.com
Mon Nov 13 15:41:24 GMT 2023

oh! Ok, I'll go look at all the HID objects reported by the sample
code @abratchik has on top-of-tree of his repo and see what makes sense to
add to NUT. PR coming this week.

On Sun, Nov 12, 2023 at 2:38 PM Jim Klimov <jimklimov+nut at gmail.com> wrote:

> Well, the intention generally is to use it as a driver, so the more
> abilities the merrier (PR would be welcome) :)
> Per comments to initial PR that added it,
> https://github.com/networkupstools/nut/pull/1044 :
> > The idea of introducing this driver is to enable creation and
> prototyping of smart UPS based on Arduino, which is inexpensive versatile
> platform very much suitable for custom fully open-source UPS development.
> I don't think it was supposed to end and be finished work at that point,
> but distractions happen...
> It might be worth asking @abratchik if he has something tinkered over this
> time and ready to upstream, as well.
> Jim Klimov
> On Sun, Nov 12, 2023, 22:46 Kelly Byrd <kbyrd at memcpy.com> wrote:
>> I posted earlier on this list about getting an Arduino Pro Micro using
>> https://github.com/abratchik/HIDPowerDevice in a simple sketch to
>> monitor a DIY UPS I have built. With the changes from that thread (I had a
>> PR merged), I was able to get usbhid-ups to recognize my device and could
>> setup NUT the rest of the way. My intended configuration is to run NUT on a
>> Raspberry Pi, have that device be master and then have clients of that NUT
>> install take action when ACPresent goes from true to false.
>> The problem I ran into is  `upsc diyups at locahost` was always showing
>> ups.status as "OB". I ran tests and confirmed the raw reports
>> included "UPS.PowerSummary.PresentStatus.ACPresent correctly showing 1 and
>> 0 as appropriate as well as correctly reporting the
>> UPS.PowerSummary.PresentStatus.Charging
>> and UPS.PowerSummary.PresentStatus.Discharging bitfields.
>> I traced the problem down to drivers/arduino.c. Apparently the Arduino
>> subdriver doesn't have an entry
>> for "UPS.PowerSummary.PresentStatus.ACPresent" in it's arduino_hid2nut[]
>> definition. The only sections present are commented as:
>> /* USB HID PDC defaults */
>> I my local source tree, I made changes to these entries copied from
>> another USB HID-based subdriver, to add:
>>         /* USB HID UPS Status*/
>>         {"BOOL", 0, 0, "UPS.PowerSummary.PresentStatus.Charging", NULL,
>> NULL, HU_FLAG_QUICK_POLL, charging_info},
>>         {"BOOL", 0, 0, "UPS.PowerSummary.PresentStatus.Discharging",
>> NULL, NULL, HU_FLAG_QUICK_POLL, discharging_info},
>>         {"BOOL", 0, 0, "UPS.PowerSummary.PresentStatus.NeedReplacement",
>> NULL, NULL, 0, replacebatt_info},
>>         {"BOOL", 0, 0, "UPS.PowerSummary.PresentStatus.ACPresent", NULL,
>> NULL, HU_FLAG_QUICK_POLL, online_info},
>> and now everything works as expected! My question for this list is why
>> there were not included in the Arduino subdriver already? AFAICT, the
>> author of the HIDPowerDevice Arduino library added the Arduino subdriver
>> via a PR a few years ago along with basic support for the common Arduino
>> VID:PID combinations in other parts of the code. But, that same library
>> definitely reports more than
>> UPS.PowerSummary.DelayBeforeShutdown, UPS.PowerSummary.DelayBeforeStartup,
>> etc.
>> and the example code he gives primarily  demonstrates how to report
>> ACPresent, Charging, and also remaining run time.
>> Am I missing something? Is there a runtime config based way to instruct
>> NUT how to map ACPresent, Charging, etc HID statuses to NUT's specific
>> structure? Over on the GitHub for the other project, others have reported
>> success with NUT and Arduinos using that library, but I don't know what
>> "success" means to them. I can't see how it's actually useful without the
>> addition of the above lines. I'm probably missing the original intent.
>> Any insight or advice is appreciated. If I'm on the right track, I'll do
>> another PR to add the above status flags (and others you all think are
>> important) to Arduino.c
>> _______________________________________________
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>> Nut-upsdev at alioth-lists.debian.net
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