NUT 2.8.1-3 "Can't claim USB device [051d:0002]@0/0: Entity not found" using usbhid-ups

[ErikDB87]

Hi all,

Yesterday, I bought a UPS for the first time in my life, and was eager to dive into NUT. But not all is working as expected... I saw a similar thread started on 18 October, but it didn't help me. (I also spent a handful of hours searching the web for solutions, and of course read the manual and FAQ - "queequeg".)

I tried shutting my UPS (APC "Back-UPS BX750MI FW:295202G -302202G") down with sudo upsdrvctl shutdown, but no response. Digging around, I found a few things that raised my suspicion, but I can't figure it out...

I followed this fine gentleman's guide (but tweaked it a bit - I don't know why he uses master and slave for example?): https://technotim.live/posts/NUT-server-guide/.
I must add that I created a few users and user groups during installation and configuration, following the documentation. But in the end, I lost oversight, and everything didn't work. So it's entirely possible there's a permissions issue somewhere. But I don't have any idea where...

Because of the trial-and-error approach, in the .conf files (shown below), a lot of stuff is commented out. I assume I can delete it, but I also assume the # should be adequate? Anyway, I keep it in the output below for clarity.

I'll just paste various outputs here, I hope that's a reasonable approach?

Thanks in advance for anyone's help!

Kind regards,

Erik

erik@MinipcLG2:/$ sudo upsdrvctl shutdown apcupskelder
Network UPS Tools - UPS driver controller 2.8.1
Network UPS Tools - Generic HID driver 0.52 (2.8.1)
USB communication driver (libusb 1.0) 0.46
select with socket: Invalid argument
Can't claim USB device [051d:0002]@0/0: Entity not found
upsnotify: failed to notify about state 4: no notification tech defined, will not spam more about it
Driver failed to start (exit status=1)

erik@MinipcLG2:/$ sudo nut-scanner -U
Scanning USB bus.
[nutdev1]
        driver = "usbhid-ups"
        port = "auto"
        vendorid = "051D"
        productid = "0002"
        product = "Back-UPS BX750MI  FW:295202G -302202G"
        serial = "9B2416A22014"
        vendor = "American Power Conversion"
        bus = "001"
        device = "004"
        busport = "002"
        ###NOTMATCHED-YET###bcdDevice = "0106"

erik@MinipcLG2:/etc/nut$ sudo usbhid-ups -a apcupskelder
sudo: usbhid-ups: opdracht niet gevonden

This seems strange? But after some googling, I found the below alternative - although I would expect it to work without /lib/nut/):

erik@MinipcLG2:/$ sudo /lib/nut/usbhid-ups -a apcupskelder
Network UPS Tools - Generic HID driver 0.52 (2.8.1)
USB communication driver (libusb 1.0) 0.46
Duplicate driver instance detected (PID file /run/nut/usbhid-ups-apcupskelder.pid exists)! Terminating other driver!

Bericht aan allen van root@MinipcLG2 (somewhere) (Wed Oct 30 10:27:32 2024):

Communications with UPS apcupskelder@localhost lost


Bericht aan allen van root@MinipcLG2 (somewhere) (Wed Oct 30 10:27:32 2024):

Communications with UPS apcupskelder@localhost lost

HIDParse: LogMax is less than LogMin. Vendor HID report descriptor may be incorrect; interpreting LogMax -1 as 255 in ReportID: 0x0c
HIDParse: LogMax is less than LogMin. Vendor HID report descriptor may be incorrect; interpreting LogMax -1 as 255 in ReportID: 0x22
HIDParse: LogMax is less than LogMin. Vendor HID report descriptor may be incorrect; interpreting LogMax -1 as 255 in ReportID: 0x40
Using subdriver: APC HID 0.100

Bericht aan allen van root@MinipcLG2 (somewhere) (Wed Oct 30 10:27:40 2024):

Communications with UPS apcupskelder@localhost established


Bericht aan allen van root@MinipcLG2 (somewhere) (Wed Oct 30 10:27:48 2024):

Communications with UPS apcupskelder@localhost lost


Bericht aan allen van root@MinipcLG2 (somewhere) (Wed Oct 30 10:27:56 2024):

Communications with UPS apcupskelder@localhost established

erik@MinipcLG2:/$ cat /etc/group | grep nut
users:x:100:nutuser,nutmon
nut:x:130:
nutuser:x:1002:
nutgroup:x:1003:nutuser
nutmon:x:1004:
nutmongroep:x:1005:nutmon

erik@MinipcLG2:/$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 004: ID 051d:0002 American Power Conversion Uninterruptible Power Supply
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

erik@MinipcLG2:/$ ls -l /dev/bus/usb/001/004
crw-rw-r-- 1 root nut 189, 3 okt 30 10:31 /dev/bus/usb/001/004

erik@MinipcLG2:/$ cat /etc/os-release
NAME="Linux Mint"
VERSION="22 (Wilma)"
ID=linuxmint
ID_LIKE="ubuntu debian"
PRETTY_NAME="Linux Mint 22"
VERSION_ID="22"
HOME_URL="https://www.linuxmint.com/"
SUPPORT_URL="https://forums.linuxmint.com/"
BUG_REPORT_URL="http://linuxmint-troubleshooting-guide.readthedocs.io/en/latest/"
PRIVACY_POLICY_URL="https://www.linuxmint.com/"
VERSION_CODENAME=wilma
UBUNTU_CODENAME=noble

erik@MinipcLG2:/$ hostnamectl
 Static hostname: MinipcLG2
       Icon name: computer-desktop
         Chassis: desktop 🖥️
      Machine ID: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
         Boot ID: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Operating System: Linux Mint 22
          Kernel: Linux 6.8.0-47-generic
    Architecture: x86-64
 Hardware Vendor: HP
  Hardware Model: HP EliteDesk 800 G2 DM 65W
Firmware Version: N21 Ver. 02.10
   Firmware Date: Sun 2016-01-24
    Firmware Age: 8y 9month 6d

erik@MinipcLG2:/$ uname -r
6.8.0-47-generic

erik@MinipcLG2:/$ sudo apt list nut*
Bezig met oplijsten... Klaar
nut-cgi/noble,now 2.8.1-3.1ubuntu2 amd64 [geïnstalleerd]
nut-client/noble,now 2.8.1-3.1ubuntu2 amd64 [geïnstalleerd]
nut-doc/noble 2.8.1-3.1ubuntu2 all
nut-i2c/noble 2.8.1-3.1ubuntu2 amd64
nut-ipmi/noble 2.8.1-3.1ubuntu2 amd64
nut-modbus/noble 2.8.1-3.1ubuntu2 amd64
nut-monitor/noble 2.8.1-3.1ubuntu2 all
nut-powerman-pdu/noble 2.8.1-3.1ubuntu2 amd64
nut-server/noble,now 2.8.1-3.1ubuntu2 amd64 [geïnstalleerd]
nut-snmp/noble 2.8.1-3.1ubuntu2 amd64
nut-xml/noble 2.8.1-3.1ubuntu2 amd64
nut/noble,now 2.8.1-3.1ubuntu2 all [geïnstalleerd]
nutcracker/noble 0.5.0+dfsg-2 amd64
nutsqlite/noble 2.0.6-4 all
nuttcp/noble 6.1.2-4build1 amd64

erik@MinipcLG2:/$ sudo /lib/nut/usbhid-ups -DDD -a apcupskelder
Network UPS Tools - Generic HID driver 0.52 (2.8.1)
USB communication driver (libusb 1.0) 0.46
   0.000000     [D3] do_global_args: var='pollinterval' val='1'
   0.000024     [D1] testval_reloadable: setting 'pollinterval' exists and differs: new value '1' vs. '2'
   0.000057     [D3] do_global_args: var='maxretry' val='3'
   0.000083     [D3] main_arg: var='driver' val='usbhid-ups'
   0.000108     [D3] main_arg: var='port' val='auto'
   0.000136     [D3] main_arg: var='desc' val='Back-UPS BX750MI  FW:295202G -302202G'
   0.000152     [D3] main_arg: var='vendorid' val='051d'
   0.000179     [D3] main_arg: var='productid' val='0002'
   0.000203     [D3] main_arg: var='serial' val='9B2416A22014'
   0.000248     [D1] Network UPS Tools version 2.8.1 (release/snapshot of 2.8.1) built with gcc (Ubuntu 13.2.0-23ubuntu2) 13.2.0 and configured with flags: --build=x86_64-linux-gnu --prefix=/usr --includedir=${prefix}/include --mandir=${prefix}/share/man --infodir=${prefix}/share/info --sysconfdir=/etc --localstatedir=/var --disable-option-checking --disable-silent-rules --libdir=${prefix}/lib/x86_64-linux-gnu --runstatedir=/run --disable-maintainer-mode --disable-dependency-tracking --prefix= --sysconfdir=/etc/nut --includedir=/usr/include --mandir=/usr/share/man --libdir=${prefix}/lib/x86_64-linux-gnu --libexecdir=/usr/libexec --with-ssl --with-nss --with-cgi --with-dev --enable-static --with-statepath=/run/nut --with-altpidpath=/run/nut --with-drvpath=/lib/nut --with-cgipath=/usr/lib/cgi-bin/nut --with-htmlpath=/usr/share/nut/www --with-pidpath=/run/nut --datadir=/usr/share/nut --with-pkgconfig-dir=/usr/lib/x86_64-linux-gnu/pkgconfig --with-user=nut --with-group=nut --with-udev-dir=/lib/udev --with-systemdsystemunitdir=/lib/systemd/system --with-systemdshutdowndir=/lib/systemd/system-shutdown --with-systemdtmpfilesdir=/usr/lib/tmpfiles.d --with-python=python3 --with-python3=/usr/bin/python3 --with-doc=man,html-single,html-chunked,pdf
   0.000352     [D1] debug level is '3'
   0.002200     [D1] Succeeded to become_user(nut): now UID=121 GID=130
   0.002266     [D1] upsdrv_initups (non-SHUT)...
   0.002285     [D2] Initializing an USB-connected UPS with library libusb-1.0.27 (API: 0x100010a) (NUT subdriver name='USB communication driver (libusb 1.0)' ver='0.46')
   0.008020     [D2] Checking device 1 of 4 (1D6B/0003)
   0.008045     [D1] Failed to open device (1D6B/0003), skipping: Access denied (insufficient permissions)
   0.008052     [D2] Checking device 2 of 4 (0403/6001)
   0.008064     [D1] Failed to open device (0403/6001), skipping: Access denied (insufficient permissions)
   0.008079     [D2] Checking device 3 of 4 (051D/0002)
   0.010003     [D2] - VendorID: 051d
   0.010014     [D2] - ProductID: 0002
   0.010018     [D2] - Manufacturer: American Power Conversion
   0.010022     [D2] - Product: Back-UPS BX750MI  FW:295202G -302202G
   0.010026     [D2] - Serial Number: 9B2416A22014
   0.010030     [D2] - Bus: 001
   0.010034     [D2] - Bus Port: 002
   0.010038     [D2] - Device: 004
   0.010042     [D2] - Device release number: 0106
   0.010046     [D2] Trying to match device
   0.010058     [D2] match_function_subdriver (non-SHUT mode): matching a device...
   0.010068     [D3] match_function_regex: matching a device...
   0.010145     [D2] Device matches
   0.010155     [D2] Reading first configuration descriptor
   0.010172     [D3] libusb_kernel_driver_active() returned 0: Success
   0.010186     [D2] failed to claim USB device: Resource busy
   0.010198     [D2] Kernel driver already detached
   0.010210     [D2] failed to claim USB device: Resource busy
   0.010225     [D2] Kernel driver already detached
   0.010237     [D2] failed to claim USB device: Resource busy
   0.010249     [D2] Kernel driver already detached
   0.010263     [D2] failed to claim USB device: Resource busy
   0.010275     [D2] Kernel driver already detached
   0.010286     Can't claim USB device [051d:0002]@0/0: Entity not found
   0.010300     upsnotify: failed to notify about state 4: no notification tech defined, will not spam more about it

erik@MinipcLG2:/etc/nut$ sudo cat /etc/nut/hosts.conf
MONITOR apcupskelder@localhost "APC-UPS kelder"

erik@MinipcLG2:/etc/nut$ sudo cat /etc/nut/nut.conf
MODE=netserver

erik@MinipcLG2:/etc/nut$ sudo cat /etc/nut/ups.conf
pollinterval = 1
maxretry = 3


[apcupskelder]
        driver = usbhid-ups
        port = auto
        desc = "Back-UPS BX750MI  FW:295202G -302202G"
        vendorid = 051d
        productid = 0002
        serial = 9B2416A22014
#        vendor = "American Power Conversion"
#        bus = 001
#        device = 005
#        busport = 002
        ###NOTMATCHED-YET###bcdDevice = "0106"

erik@MinipcLG2:/etc/nut$ sudo cat /etc/nut/upsd.conf
LISTEN 0.0.0.0 3493

erik@MinipcLG2:/etc/nut$ sudo cat /etc/nut/upsd.users
#[bespieder]
[monuser]
  password  = indUStr*a
#  bekijker primary
#  admin master
  admin primary

erik@MinipcLG2:/etc/nut$ sudo cat /etc/nut/upsmon.conf
#RUN_AS_USER nutgebruiker
RUN_AS_USER root
#MONITOR apcupskelder@localhost 1 bekijker indUStr*a primary
#MONITOR apcupskelder@localhost 1 admin indUStr*a master
MONITOR apcupskelder@localhost 1 admin indUStr*a primary


MINSUPPLIES 1
SHUTDOWNCMD "/sbin/shutdown -h +0"
NOTIFYCMD /usr/sbin/upssched
POLLFREQ 2
POLLFREQALERT 1
HOSTSYNC 15
DEADTIME 15
POWERDOWNFLAG /etc/nut/killpower

NOTIFYMSG ONLINE    "UPS %s on line power"
NOTIFYMSG ONBATT    "UPS %s on battery"
NOTIFYMSG LOWBATT   "UPS %s battery is low"
NOTIFYMSG FSD       "UPS %s: forced shutdown in progress"
NOTIFYMSG COMMOK    "Communications with UPS %s established"
NOTIFYMSG COMMBAD   "Communications with UPS %s lost"
NOTIFYMSG SHUTDOWN  "Auto logout and shutdown proceeding"
NOTIFYMSG REPLBATT  "UPS %s battery needs to be replaced"
NOTIFYMSG NOCOMM    "UPS %s is unavailable"
NOTIFYMSG NOPARENT  "upsmon parent process died - shutdown impossible"

NOTIFYFLAG ONLINE   SYSLOG+WALL+EXEC
NOTIFYFLAG ONBATT   SYSLOG+WALL+EXEC
NOTIFYFLAG LOWBATT  SYSLOG+WALL
NOTIFYFLAG FSD      SYSLOG+WALL+EXEC
NOTIFYFLAG COMMOK   SYSLOG+WALL+EXEC
NOTIFYFLAG COMMBAD  SYSLOG+WALL+EXEC
NOTIFYFLAG SHUTDOWN SYSLOG+WALL+EXEC
NOTIFYFLAG REPLBATT SYSLOG+WALL
NOTIFYFLAG NOCOMM   SYSLOG+WALL+EXEC
NOTIFYFLAG NOPARENT SYSLOG+WALL

RBWARNTIME 43200

NOCOMMWARNTIME 600

FINALDELAY 5

[ErikDB87]

I thought removing and installing the package again might solve the problem. I also removed /etc/nut.

But somehow, the directory /etc/nut is created again, but the config files in it are not...?

So I did this:

sudo apt remove nut nut-client nut-server
sudo reboot
sudo apt autoremove
sudo reboot
sudo rm -r /etc/nut
sudo apt install nut nut-client nut-server

And now:

erik@MinipcLG2:/etc/nut$ ls -pal
totaal 16
drwxr-xr-x   2 root root  4096 nov  2 16:29 ./
drwxr-xr-x 182 root root 12288 nov  2 16:29 ../

Somehow, I made it worse... But I don't understand how installing the packages again fails to install these files...?

EDIT
Some googling almost fixed this: https://ubuntuforums.org/showthread.php?t=2487834

But hosts.conf is still missing...

[jimklimov]

I believe some answers around this general issue are in the mailing list.

As for packaging, NUT team does not impact it directly, so it is technically a distro matter. That said, probably different packages defined for NUT there which deliver files which might need configuration files, all deliver the /etc/nut directory. There may be some package which also delivers *.conf.sample files which are just that - well-commented samples (to copy into *.conf and adapt to your setup). Packaging can not divine your device details, IP addresses, etc. to recreate your customized config files.

[ErikDB87]

Of course I didn't expect my amended config files to appear. :) But the standard ones - which were installed when I first installed NUT, didn't reappear... I manually added hosts.conf using sudo nano hosts.conf.

Anyway, I had hoped this reinstall would have reset all the permissions. But I was wrong...

But it looks like I'm where I started out; so maybe no harm no foul?

[jimklimov]

Probably no foul. As you edited ups.conf, NDE could have picked up the device definition and created the nut-driver@apcupskelder.service instance again, so the manually-started driver conflicts with it again.

Re-check if the unit does exist and does not complain (like on the mailing list) - if so, go on to upsd (nut-server) and upsc client (to check it works) and finally upsmon for notifications and safe shutdown.

[ErikDB87]

I'm not sure I fully understand what you mean... I'm not really a Linux master :)

But here are some outputs:

erik@MinipcLG2:/etc/nut$ systemctl status nut-driver@apcupskelder.service
● nut-driver@apcupskelder.service - Network UPS Tools - device driver for NUT device 'apcupskelder'
     Loaded: loaded (/usr/lib/systemd/system/nut-driver@.service; enabled; preset: enabled)
    Drop-In: /etc/systemd/system/nut-driver@apcupskelder.service.d
             └─nut-driver-enumerator-generated-checksum.conf, nut-driver-enumerator-generated.conf
     Active: active (running) since Sat 2024-11-02 20:27:55 CET; 48s ago
    Process: 11894 ExecStartPre=/usr/bin/systemd-tmpfiles --create /usr/lib/tmpfiles.d/nut-common-tmpfiles.conf (code=exited, status=0/SUCCESS)
    Process: 11896 ExecStart=/bin/sh -c NUTDEV="`/usr/libexec/nut-driver-enumerator.sh --get-device-for-service apcupskelder`" && [ -n "$NUTDEV" ] || { echo "FATAL: Could not find a NUT device section for service unit apcupskelder" >&2 ; exit 1 ; } ; exec /sbin/upsdrvctl  start "$NUTDEV" (code=exited, status=0/SUCCESS)
   Main PID: 11934 (usbhid-ups)
      Tasks: 1 (limit: 9284)
     Memory: 608.0K (peak: 2.6M)
        CPU: 99ms
     CGroup: /system.slice/system-nut\x2ddriver.slice/nut-driver@apcupskelder.service
             └─11934 /lib/nut/usbhid-ups -a apcupskelder

nov 02 20:27:55 MinipcLG2 nut-driver@apcupskelder[11923]: HIDParse: LogMax is less than LogMin. Vendor HID report descriptor may be incorrect; interpreting LogMax -1 as 255 in ReportID: 0x22
nov 02 20:27:55 MinipcLG2 nut-driver@apcupskelder[11923]: HIDParse: LogMax is less than LogMin. Vendor HID report descriptor may be incorrect; interpreting LogMax -1 as 255 in ReportID: 0x40
nov 02 20:27:55 MinipcLG2 nut-driver@apcupskelder[11923]: Using subdriver: APC HID 0.100
nov 02 20:27:55 MinipcLG2 nut-driver@apcupskelder[11923]: Network UPS Tools - Generic HID driver 0.52 (2.8.1)
nov 02 20:27:55 MinipcLG2 nut-driver@apcupskelder[11923]: USB communication driver (libusb 1.0) 0.46
nov 02 20:27:55 MinipcLG2 usbhid-ups[11934]: Startup successful
nov 02 20:27:55 MinipcLG2 usbhid-ups[11934]: upsnotify: failed to notify about state 2: no notification tech defined, will not spam more about it
nov 02 20:27:55 MinipcLG2 nut-driver@apcupskelder[11896]: Network UPS Tools - UPS driver controller 2.8.1
nov 02 20:27:55 MinipcLG2 systemd[1]: Started nut-driver@apcupskelder.service - Network UPS Tools - device driver for NUT device 'apcupskelder'.
nov 02 20:27:56 MinipcLG2 usbhid-ups[11934]: sock_connect: enabling asynchronous mode (auto)

erik@MinipcLG2:/etc/nut$ systemctl status nut-server.service
● nut-server.service - Network UPS Tools - power devices information server
     Loaded: loaded (/usr/lib/systemd/system/nut-server.service; enabled; preset: enabled)
     Active: active (running) since Sat 2024-11-02 20:27:35 CET; 3min 24s ago
    Process: 11815 ExecStartPre=/usr/bin/systemd-tmpfiles --create /usr/lib/tmpfiles.d/nut-common-tmpfiles.conf (code=exited, status=0/SUCCESS)
   Main PID: 11818 (upsd)
      Tasks: 1 (limit: 9284)
     Memory: 464.0K (peak: 1.5M)
        CPU: 65ms
     CGroup: /system.slice/nut-server.service
             └─11818 /lib/nut/upsd -F

nov 02 20:27:35 MinipcLG2 nut-server[11818]: Running as foreground process, not saving a PID file
nov 02 20:27:35 MinipcLG2 nut-server[11818]: upsnotify: failed to notify about state 2: no notification tech defined, will not spam more about it
nov 02 20:27:35 MinipcLG2 upsd[11818]: Running as foreground process, not saving a PID file
nov 02 20:27:35 MinipcLG2 upsd[11818]: upsnotify: failed to notify about state 2: no notification tech defined, will not spam more about it
nov 02 20:27:35 MinipcLG2 nut-server[11818]: Can't connect to UPS [apcupskelder] (usbhid-ups-apcupskelder): No such file or directory
nov 02 20:27:35 MinipcLG2 upsd[11818]: Can't connect to UPS [apcupskelder] (usbhid-ups-apcupskelder): No such file or directory
nov 02 20:27:37 MinipcLG2 nut-server[11818]: Connected to UPS [apcupskelder]: usbhid-ups-apcupskelder
nov 02 20:27:37 MinipcLG2 upsd[11818]: Connected to UPS [apcupskelder]: usbhid-ups-apcupskelder
nov 02 20:27:56 MinipcLG2 nut-server[11818]: Connected to UPS [apcupskelder]: usbhid-ups-apcupskelder
nov 02 20:27:56 MinipcLG2 upsd[11818]: Connected to UPS [apcupskelder]: usbhid-ups-apcupskelder

erik@MinipcLG2:/etc/nut$ systemctl status upsd
● nut-server.service - Network UPS Tools - power devices information server
     Loaded: loaded (/usr/lib/systemd/system/nut-server.service; enabled; preset: enabled)
     Active: active (running) since Sat 2024-11-02 20:27:35 CET; 3min 49s ago
    Process: 11815 ExecStartPre=/usr/bin/systemd-tmpfiles --create /usr/lib/tmpfiles.d/nut-common-tmpfiles.conf (code=exited, status=0/SUCCESS)
   Main PID: 11818 (upsd)
      Tasks: 1 (limit: 9284)
     Memory: 464.0K (peak: 1.5M)
        CPU: 71ms
     CGroup: /system.slice/nut-server.service
             └─11818 /lib/nut/upsd -F

nov 02 20:27:35 MinipcLG2 nut-server[11818]: Running as foreground process, not saving a PID file
nov 02 20:27:35 MinipcLG2 nut-server[11818]: upsnotify: failed to notify about state 2: no notification tech defined, will not spam more about it
nov 02 20:27:35 MinipcLG2 upsd[11818]: Running as foreground process, not saving a PID file
nov 02 20:27:35 MinipcLG2 upsd[11818]: upsnotify: failed to notify about state 2: no notification tech defined, will not spam more about it
nov 02 20:27:35 MinipcLG2 nut-server[11818]: Can't connect to UPS [apcupskelder] (usbhid-ups-apcupskelder): No such file or directory
nov 02 20:27:35 MinipcLG2 upsd[11818]: Can't connect to UPS [apcupskelder] (usbhid-ups-apcupskelder): No such file or directory
nov 02 20:27:37 MinipcLG2 nut-server[11818]: Connected to UPS [apcupskelder]: usbhid-ups-apcupskelder
nov 02 20:27:37 MinipcLG2 upsd[11818]: Connected to UPS [apcupskelder]: usbhid-ups-apcupskelder
nov 02 20:27:56 MinipcLG2 nut-server[11818]: Connected to UPS [apcupskelder]: usbhid-ups-apcupskelder
nov 02 20:27:56 MinipcLG2 upsd[11818]: Connected to UPS [apcupskelder]: usbhid-ups-apcupskelder

erik@MinipcLG2:~$ systemctl status upsc
Unit upsc.service could not be found.

erik@MinipcLG2:/etc/nut$ systemctl status upsmon
● nut-monitor.service - Network UPS Tools - power device monitor and shutdown controller
     Loaded: loaded (/usr/lib/systemd/system/nut-monitor.service; enabled; preset: enabled)
     Active: active (running) since Sat 2024-11-02 20:27:35 CET; 4min 10s ago
    Process: 11836 ExecStartPre=/usr/bin/systemd-tmpfiles --create /usr/lib/tmpfiles.d/nut-common-tmpfiles.conf (code=exited, status=0/SUCCESS)
   Main PID: 11839 (upsmon)
      Tasks: 2 (limit: 9284)
     Memory: 888.0K (peak: 2.0M)
        CPU: 86ms
     CGroup: /system.slice/nut-monitor.service
             ├─11839 /lib/nut/upsmon -F
             └─11842 /lib/nut/upsmon -F

nov 02 20:27:35 MinipcLG2 nut-monitor[11839]: Using power down flag file /etc/nut/killpower
nov 02 20:27:35 MinipcLG2 nut-monitor[11842]: Init SSL without certificate database
nov 02 20:27:35 MinipcLG2 nut-monitor[11842]: upsnotify: failed to notify about state 2: no notification tech defined, will not spam more about it
nov 02 20:27:35 MinipcLG2 nut-monitor[11842]: Login on UPS [apcupskelder@localhost] failed - got [ERR ACCESS-DENIED]
nov 02 20:27:52 MinipcLG2 nut-monitor[11842]: Poll UPS [apcupskelder@localhost] failed - Driver not connected
nov 02 20:27:52 MinipcLG2 nut-monitor[11842]: Communications with UPS apcupskelder@localhost lost
nov 02 20:27:52 MinipcLG2 nut-monitor[11925]: Network UPS Tools upsmon 2.8.1
nov 02 20:27:54 MinipcLG2 nut-monitor[11842]: Poll UPS [apcupskelder@localhost] failed - Driver not connected
nov 02 20:27:56 MinipcLG2 nut-monitor[11842]: Communications with UPS apcupskelder@localhost established
nov 02 20:27:56 MinipcLG2 nut-monitor[11936]: Network UPS Tools upsmon 2.8.1

There seem to be some problems with usbhid-ups-apcupskelder...

[jimklimov]

Looks great actually: nut-driver@apcupskelder.service initialized around 20:27:55, and at 20:27:56 accepted a socket connection. That's the same moment logged by nut-server.service (aliased as upsd to match the program name):

nov 02 20:27:56 MinipcLG2 upsd[11818]: Connected to UPS [apcupskelder]: usbhid-ups-apcupskelder

upsc is not a service, it is a command-line client. You should just run

:; upsc apcupskelder

(if on the same machine as upsd) and it should report a number of key: value pairs for some driver settings and all device readings it found.

WARNING: The nut-monitor.service (aliased as upsmon) did have a hiccup:

Login on UPS ***@***.*** failed - got [ERR ACCESS-DENIED]

This usually means either mismatch between /etc/nut/upsd.users and the credentials in MONITOR line of upsmon.conf, or bad permissions so one of the daemons can not read its config (or too open permissions so it can refuse to trust that file, whose passwords anyone can know).

I am a bit puzzled about upsnotify: failed to notify about state 2: no notification tech defined, will not spam more about it lines (daemon should have noticed it run under systemd, but that is not too consequential).

[ErikDB87]

upsc is not a service, it is a command-line client. You should just run\n\n:; upsc apcupskelder\n(if on the same machine as upsd) and it should report a number of key: value pairs for some driver settings and all device readings it found.

Indeed:

erik@MinipcLG2:~$ upsc apcupskelder
Init SSL without certificate database
battery.charge: 100
battery.charge.low: 10
battery.mfr.date: 2001/01/01
battery.runtime: 3920
battery.runtime.low: 120
battery.type: PbAc
battery.voltage: 13.6
battery.voltage.nominal: 12.0
device.mfr: American Power Conversion
device.model: Back-UPS BX750MI
device.serial: 9B2416A22014
device.type: ups
driver.debug: 0
driver.flag.allow_killpower: 0
driver.name: usbhid-ups
driver.parameter.pollfreq: 30
driver.parameter.pollinterval: 1
driver.parameter.port: auto
driver.parameter.productid: 0002
driver.parameter.serial: 9B2416A22014
driver.parameter.synchronous: auto
driver.parameter.vendorid: 051d
driver.state: quiet
driver.version: 2.8.1
driver.version.data: APC HID 0.100
driver.version.internal: 0.52
driver.version.usb: libusb-1.0.27 (API: 0x100010a)
input.sensitivity: low
input.transfer.high: 295
input.transfer.low: 145
input.voltage: 230.0
input.voltage.nominal: 230
ups.beeper.status: enabled
ups.delay.shutdown: 20
ups.firmware: 295202G -302202G
ups.load: 0
ups.mfr: American Power Conversion
ups.mfr.date: 2024/04/23
ups.model: Back-UPS BX750MI
ups.productid: 0002
ups.realpower.nominal: 410
ups.serial: 9B2416A22014
ups.status: OL
ups.test.result: Done and passed
ups.timer.reboot: 0
ups.timer.shutdown: -1
ups.vendorid: 051d 

WARNING: The nut-monitor.service (aliased as upsmon) did have a hiccup:\n\nLogin on UPS @.*** failed - got [ERR ACCESS-DENIED]\nThis usually means either mismatch between /etc/nut/upsd.users and the credentials in MONITOR line of upsmon.conf, or bad permissions so one of the daemons can not read its config (or too open permissions so it can refuse to trust that file, whose passwords anyone can know).

I had hoped a fresh install would have reset all the permissions... Do you have any idea which commands might fix the permissions issues?

[jimklimov]

Looking at your earlier post, the upsd.users you've posted seems very wrong. Please check the sample at https://github.com/networkupstools/nut/blob/master/conf/upsd.users.sample about syntax and expected contents. Also maybe change the passwords in the final configuration, just in case ;)

Also note, with an APC BX###MI device, #2565 and related issues and PRs may be relevant. That fix is not part of a released version yet though, so if you'd end up needing it before a release is cut and gets through distro packaging queues - a custom build would be required, e.g. per https://github.com/networkupstools/nut/wiki/Building-NUT-for-in%E2%80%90place-upgrades-or-non%E2%80%90disruptive-tests