[Nut-upsuser] APC ups reports "OL DISCHRG" as its normal status, even when plugged into mains

[Matt Kinni]

Hello nut users!
I have an APC Back-UPS BGM1500 connected via a serial->usb cable, using 
the usbhid-ups driver.  Everything appears to work and automated 
shutdowns occur as expected in response to the lowbatt signal, but 
nut-driver is spamming the logs with this error message on every poll 
interval:
> 0.430476     [D1] Quick update...
> 0.430484     ups_status_set: seems that UPS [GamingUPS] is in OL+DISCHRG state now. Is it calibrating or do you perhaps want to set 'onlinedischarge' option? Some UPS models (e.g. CyberPower UT series) emit OL+DISCHRG when offline.
> 1.866888     sock_connect: enabling asynchronous mode (auto)
> 2.262626     [D1] upsdrv_updateinfo...
> 2.270082     [D1] Got 1 HID objects...
> 2.270092     [D1] Quick update...
> 2.284067     ups_status_set: seems that UPS [GamingUPS] is in OL+DISCHRG state now. Is it calibrating or do you perhaps want to set 'onlinedischarge' option? Some UPS models (e.g. CyberPower UT series) emit OL+DISCHRG when offline.
> 4.264627     [D1] upsdrv_updateinfo...
> 4.334114     [D1] Got 9 HID objects...
> 4.334131     [D1] Quick update...
> 4.345097     ups_status_set: seems that UPS [GamingUPS] is in OL+DISCHRG state now. Is it calibrating or do you perhaps want to set 'onlinedischarge' option? Some UPS models (e.g. CyberPower UT series) emit OL+DISCHRG when offline.
> 6.266562     [D1] upsdrv_updateinfo...
> 6.270145     [D1] Got 1 HID objects...
> 6.270162     [D1] Quick update...
> 6.284123     ups_status_set: seems that UPS [GamingUPS] is in OL+DISCHRG state now. Is it calibrating or do you perhaps want to set 'onlinedischarge' option? Some UPS models (e.g. CyberPower UT series) emit OL+DISCHRG when offline.

"DISCHRG" is always present on the status line regardless of whether the 
ups is actually connected to the wall or not, so this appears to be its 
"normal" state and can't be taken at face value.

Is there any way I can get the usb driver to stop complaining about 
this?  Unfortunately I don't think setting 'onlinedischarge' in ups.conf 
would produce the desired effect, but I'd like to stop the log spam.

Thanks