CPS HID: Many unknown readings

[jimklimov]

Offloading from #2718 (comment) :

There are quite a few entries (for different Reports) in https://github.com/user-attachments/files/18149734/usbhid-ups_DDDDDD_d1_a_ups.txt.gz like:

   0.030167	[D4] Entering libusb_get_report
   0.030435	[D2] nut_libusb_get_report: Overflow
   0.030456	[D1] Can't retrieve Report 2d: Success
   0.030469	[D5] hid_lookup_path: 00840004 -> UPS
   0.030482	[D5] hid_lookup_path: ff01001d -> not found in lookup table
   0.030494	[D5] hid_lookup_path: ff01001b -> not found in lookup table
   0.030506	[D5] hid_lookup_path: ff01001f -> not found in lookup table
   0.030518	[D1] Path: UPS.ff01001d.ff01001b.ff01001f, Type: Feature, ReportID: 0x2d, Offset: 2, Size: 1

or in #1973 (comment) like:

   0.233154     [D1] Can't retrieve Report 29: Value too large for defined data type
   0.233264     [D1] Path: UPS.ff01001d.ff01001b.ff010017, Type: Output, ReportID: 0x29, Offset: 8, Size: 8
   0.239493     [D2] libusb_get_report: error sending control message: Value too large for defined data type
   0.239632     [D1] Can't retrieve Report 2d: Value too large for defined data type
   0.239748     [D1] Path: UPS.ff01001d.ff01001b.ff010010, Type: Feature, ReportID: 0x2d, Offset: 0, Size: 1
   0.240556     [D2] libusb_get_report: error sending control message: Value too large for defined data type

...where on one hand, we do not even know the mapping of numeric HID path components to their logical roles/names, and on another - something overflows. I did not investigate what happens, but we might expect a number by default and get a string (too large for a buffer) or something else - just guessing based on it being an unknown report, and that we SETINFO strings (mfr, model, etc.) just after those.

Also more specifically about string fetches (which I think #2604 should have solved, unless this dialog is broken in some other way):

   0.032835	[D2] Path: UPS.PowerSummary.iDeviceChemistry, Type: Feature, ReportID: 0x04, Offset: 0, Size: 8, Value: 4
   0.033137	[D1] nut_usb_get_string_descriptor: string descriptor 0 request failed, retrying...
   0.084018	[D1] nut_usb_get_string_descriptor: string descriptor 0 request failed, retrying...
   0.134874	[D2] nut_libusb_get_string: Overflow
   0.134914	[D5] send_to_all: SETINFO battery.type ""
...

   0.135121	[D2] Path: UPS.PowerSummary.iOEMInformation, Type: Feature, ReportID: 0x03, Offset: 0, Size: 8, Value: 3
   0.136103	[D1] nut_usb_get_string_descriptor: string descriptor 0 request failed, retrying...
   0.187014	[D1] nut_usb_get_string_descriptor: string descriptor 0 request failed, retrying...
   0.237877	[D2] nut_libusb_get_string: Overflow
   0.237918	[D5] send_to_all: SETINFO battery.mfr.date ""