[Nut-upsuser] Problems with APC Smart-UPS Series

[Sebastian Holzapfel]

Ok, so I ask for help.
I was able to configure through usbhid-ups driver my APC Smart-UPS SRT
3000XLA, however the driver reports that the UPS is on-baterry all the time
despite that it's actually on-line. Searching over the internet I have
found that actually drivers for APC usually use proprietary power flags and
fails to refresh the standard powerflags used by NUT.
For example this is an actual capture of the state that NUT reports that
the UPS is:
# upsc ups at A.B.C.D
device.mfr: American Power Conversion
device.model: Smart-UPS SRT
device.serial: AS183929XXXX
device.type: ups
driver.debug: 0
driver.flag.allow_killpower: 0
driver.name: usbhid-ups
driver.parameter.interrupt_pipe_no_events_tolerance: -1
driver.parameter.pollfreq: 30
driver.parameter.pollinterval: 2
driver.parameter.port: auto
driver.parameter.synchronous: auto
driver.state: quiet
driver.version: 2.8.4
driver.version.data: APC HID 0.100
driver.version.internal: 0.67
driver.version.usb: libusb-1.0.27 (API: 0x0100010A)
ups.firmware: UPS 06.0 / ID=1010
ups.mfr: American Power Conversion
ups.model: Smart-UPS SRT
ups.productid: 0003
ups.serial: AS183929XXXX
ups.status: OB
ups.vendorid: 051d

See, there is not even any power information, and it says that is
on-battery where actually it isn't.
Now, this is a common problem known with this UPS's. Mostly, everyone who
has faced this problem has resorted to buying the SNMP network module of
the UPS, but the problem is that this optional unit isn't available on my
country so I'm out of luck with that and forced to still use the USB
interface.
Now, the new version of the original software that manages this UPS, called
PowerChute Serial Shutdown, actually may act as an SNMP server but uses its
own sets of OID's rather than the universally standard ones. I don't know
how it can manage Synology but it's able to actually understand the SNMP
OID's that PowerChute servers and can get the true info of the probable
battery backup time, the load and almost everything; despite that Synology
DOES use under the hood NUT too but with some major modification (the
service is not officially called NUT but it is NUT given the hidden config
that is under /usr/syno/etc/ups/ is the same structure as is), maybe this
modifications that they do are able to make this units compatible with
PowerChute Serial Shutdown, who knows? Probably it is, since I tried to
configure NUT to get the states through PowerChute using the snmp driver
but it was unsuccessful to read what the software reported.
Anyways, if I do an snmpwalk to get the PowerChute OID's of the SNMP server
that has and I can provide what the values stands for, can the MIB's be
added to the SNMP driver on NUT for a newer release?
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