EDIT: Got it fixed thanks to some help from their mailing list. The command in upsmon.conf is case sensitive. It should be MONITOR and not monitor. That seems to have fixed the issue.

----------------------------

Any NUT experts out there? I'd really appreciate some help here.

I have two identical APC UPSes, plugged into a Rasberry Pi and I am trying to setup NUT for both of them.

nut-scanner returns:

$ nut-scanner -q
SNMP library not found. SNMP search disabled.
Neon library not found. XML search disabled.
IPMI library not found. IPMI search disabled.
[nutdev1]
        driver = "usbhid-ups"
        port = "auto"
        vendorid = "051D"
        productid = "0002"
        bus = "001"
[nutdev2]
        driver = "usbhid-ups"
        port = "auto"
        vendorid = "051D"
        productid = "0002"
        bus = "001"

As you can see they are absolutely identical, with no way to discern them apart, and I think this is the root of my issue.

When I run:

lsusb -v

I get results that include the serial numbers. So thanks to this post, I was able to create some custom udev rules to create /dev/apc-t and /dev/apc-b and this appears to work.

My ups.conf specifies the devices like this:

[APC-t]
        driver = usbhid-ups
        port = /dev/apc-t
        desc = "APC UPS - Top"
        vendorid = 051D
        productid = 0002
        bus = 001
        serial = "xxxxxxx855"

[APC-b]
        driver = usbhid-ups
        port = /dev/apc-b
        desc = "APC UPS - Bottom"
        vendorid = 051D
        productid = 0002
        bus = 001
        serial = "xxxxxxx867"

However, when I try to restart the nut-client service they error out and I get:

Starting Network UPS Tools - power device monitor and shutdown controller...
fopen /run/nut/upsmon.pid: No such file or directory
/etc/nut/upsmon.conf line 86: invalid directive monitor APC-t@localhost 1 admin <8 random letters> master
/etc/nut/upsmon.conf line 87: invalid directive monitor APC-b@localhost 1 admin <8 random letters> master
Using power down flag file /etc/killpower
Network UPS Tools upsmon 2.7.4
Fatal error: insufficient power configured!
Sum of power values........: 0
Minimum value (MINSUPPLIES): 1
Edit your upsmon.conf and change the values.
nut-monitor.service: Control process exited, code=exited, status=1/FAILURE
nut-monitor.service: Failed with result 'exit-code'.
Failed to start Network UPS Tools - power device monitor and shutdown controller.

Restarting the nut-server service seems to work fine

Connected to UPS [APC-b]: usbhid-ups-APC-b
Connected to UPS [APC-t]: usbhid-ups-APC-t
Connected to UPS [APC-b]: usbhid-ups-APC-b
Connected to UPS [APC-t]: usbhid-ups-APC-t
Startup successful
Started Network UPS Tools - power devices information server.
Data for UPS [APC-t] is stale - check driver
Data for UPS [APC-b] is stale - check driver
UPS [APC-t] data is no longer stale
UPS [APC-b] data is no longer stale

At this point I have no idea what to do to get this work.

Here are all the config files.

nut.conf

MODE=netserver

ups.conf

maxretry = 3

pollinterval = 1

[APC-t]
        driver = usbhid-ups
        port = /dev/apc-t
        desc = "APC UPS - Top"
        vendorid = 051D
        productid = 0002
        bus = 001
        serial = "xxxxxxx855"

[APC-b]
        driver = usbhid-ups
        port = /dev/apc-b
        desc = "APC UPS - Bottom"
        vendorid = 051D
        productid = 0002
        bus = 001
        serial = "xxxxxxx867"

upsd.conf

LISTEN 0.0.0.0 3493

upsd.users

           [admin]
               password = <8 random letters>
               upsmon master

upsmon.conf

RUN_AS_USER root

monitor APC-t@localhost 1 admin <8 random letters> master
monitor APC-b@localhost 1 admin <8 random letters> master
MINSUPPLIES 1
SHUTDOWNCMD "/sbin/shutdown -h +0"
POLLFREQ 5
POLLFREQALERT 5
HOSTSYNC 15
DEADTIME 15
POWERDOWNFLAG /etc/killpower
RBWARNTIME 43200
NOCOMMWARNTIME 300
FINALDELAY 5

ls /dev/a*

/dev/apc-b  /dev/apc-t  /dev/autofs

Oddly, I can get info from the UPSes

upsc APC-t@localhost

Init SSL without certificate database
battery.charge: 100
battery.charge.low: 10
battery.charge.warning: 50
battery.mfr.date: 2020/01/29
battery.runtime: 1320
battery.runtime.low: 120
battery.temperature: 27.4
battery.type: PbAc
battery.voltage: 27.5
battery.voltage.nominal: 24.0
device.mfr: American Power Conversion
device.model: Smart-UPS 1500 RM
device.serial: xxxxxxxx855
device.type: ups
driver.name: usbhid-ups
driver.parameter.bus: 001
driver.parameter.pollfreq: 30
driver.parameter.pollinterval: 1
driver.parameter.port: /dev/apc-t
driver.parameter.productid: 0002
driver.parameter.serial: xxxxxxxx855
driver.parameter.synchronous: no
driver.parameter.vendorid: 051D
driver.version: 2.7.4
driver.version.data: APC HID 0.96
driver.version.internal: 0.41
input.sensitivity: high
input.transfer.high: 127
input.transfer.low: 106
input.voltage: 121.6
output.frequency: 60.0
output.voltage: 121.6
output.voltage.nominal: 120.0
ups.beeper.status: enabled
ups.delay.shutdown: 20
ups.delay.start: 30
ups.firmware: 617.3.D
ups.firmware.aux: 8.1
ups.load: 28.6
ups.mfr: American Power Conversion
ups.mfr.date: 2007/08/29
ups.model: Smart-UPS 1500 RM
ups.productid: 0002
ups.serial: AS0735130855
ups.status: OL
ups.test.result: No test initiated
ups.timer.reboot: -1
ups.timer.shutdown: -1
ups.timer.start: -1
ups.vendorid: 051d

upsc APC-b@localhost

Init SSL without certificate database
battery.charge: 100
battery.charge.low: 10
battery.charge.warning: 50
battery.mfr.date: 2020/01/29
battery.runtime: 1020
battery.runtime.low: 120
battery.temperature: 27.9
battery.type: PbAc
battery.voltage: 27.5
battery.voltage.nominal: 24.0
device.mfr: American Power Conversion
device.model: Smart-UPS 1500 RM
device.serial: xxxxxxxx867
device.type: ups
driver.name: usbhid-ups
driver.parameter.bus: 001
driver.parameter.pollfreq: 30
driver.parameter.pollinterval: 1
driver.parameter.port: /dev/apc-b
driver.parameter.productid: 0002
driver.parameter.serial: xxxxxxxx867
driver.parameter.synchronous: no
driver.parameter.vendorid: 051D
driver.version: 2.7.4
driver.version.data: APC HID 0.96
driver.version.internal: 0.41
input.sensitivity: high
input.transfer.high: 127
input.transfer.low: 106
input.voltage: 122.4
output.frequency: 60.0
output.voltage: 122.4
output.voltage.nominal: 120.0
ups.beeper.status: enabled
ups.delay.shutdown: 20
ups.delay.start: 30
ups.firmware: 617.3.D
ups.firmware.aux: 8.1
ups.load: 48.7
ups.mfr: American Power Conversion
ups.mfr.date: 2007/08/29
ups.model: Smart-UPS 1500 RM
ups.productid: 0002
ups.serial: AS0735130867
ups.status: OL
ups.test.result: No test initiated
ups.timer.reboot: -1
ups.timer.shutdown: -1
ups.timer.start: -1
ups.vendorid: 051d