Communicating with NUCUPS, but voltages and currents reported as zero

[adamcandy]

Hi @nicupavel and @mini-box, Fantastic to have a Linux tool to talk with the mini-box UPSs - good job! I have built and tested. It looks to be communicating with the UPS fine, but has a few issues reading some of the data, such as voltage and current (see logs below). This is possibly connected to the hid_interrupt_read failed with return code -110 error reported but the usb library. Have tried running with root user and also made sure to stop NUT and processes that might have locked access to the USB interface. (in fact this cleared the error interface 0 already claimed by driver "usbfs", attempting to detach it I saw initially.) Is there anything you can suggest we try to correct this? Thank you for your help. Cheers, Adam

$ openups -t nucups -s
Device selected: nucups
Selected device nucups: DC-DC NUC UPS
Found and initialized hid device:
Product: DCDC-NUC UPS, Manufacturer: MINI-BOX.COM, Firmware Version: (null)
hid_interrupt_read failed with return code -110
Read error: -110
hid_interrupt_read failed with return code -110
Read error: -110
 Input: 0
 Output: 0
 Charger Flags: 11521
 State Flags: 0
 Shutdown Flags: 0
 VIn: 0.000000
 IOut: 0.000000
 VOut:0.000000
 VIgnition: 0.000000
 POut: 0.000000
 Temperature1: 0.000000
 Temperature2: 0.000000
 Temperature3: 0.000000
 Temperature4: 0.000000
 BatVoltage1: 3.851000
  BatVoltage2: 3.850000
 BatVoltage3: 3.852000
 BatVoltage4: 3.850000
 CellBalanceOn1: 0
 CellBalanceOn2: 0
 CellBalanceOn3: 0
 CellBalanceOn4: 0
 CellDetected1: 1
 CellDetected2: 1
 CellDetected3: 1
 CellDetected4: 1
 BatOverallVoltage: 15.404000
 BatPack: 18.174999
 IChgDchg: 0.000000
 VerMajor: 0
 VerMinor: 0
 State: 0
 ChargeEndedCondition: 3
 BatteryLevel: 99
 Mode: 0
 CPUUsage: 0
Read configuration
failed to release interface: 0

$ lsusb
...
Bus 001 Device 008: ID 04d8:d007 Microchip Technology, Inc. 
...