[Nut-upsuser] Debian 10 nut 2.7.4-8 and APC Back UPS 600i on 940-0020B

[tovis r-visor]

Dir list!

I'm using nut for many years on my home "server" without problems running
on Debian 6.x nut version 2.4.3
Now I have decided to move to Debian 10. I have started from zero and
install new system on a different disk. I have successfully installed new
nut version 2.7.4
I've found one issue, that new version see always "low battery" state.
Excerpt from syslog:
Aug 27 16:52:52 nusi upsdrvctl[501]: UPS type: APC Back-UPS (940-0020B/C
cable)
Aug 27 16:52:52 nusi upsdrvctl[501]: parse_input_signals: input overrides
specified, but no effective difference - check for typos?
Aug 27 16:52:52 nusi upsdrvctl[501]: Network UPS Tools - UPS driver
controller 2.7.4
Aug 27 16:52:53 nusi upsd[506]: fopen /var/run/nut/upsd.pid: No such file
or directory
Aug 27 16:52:53 nusi upsd[506]: listening on 127.0.0.1 port 3493
Aug 27 16:52:53 nusi upsd[506]: listening on 127.0.0.1 port 3493
Aug 27 16:52:53 nusi upsd[571]: Startup successful
Aug 27 16:52:53 nusi upsmon[776]: fopen /var/run/nut/upsmon.pid: No such
file or directory
Aug 27 16:52:53 nusi upsmon[776]: UPS: APC600 at localhost (master) (power
value 1)
Aug 27 16:52:53 nusi upsmon[776]: Using power down flag file /etc/killpower
Aug 27 16:52:53 nusi upsmon[780]: Startup successful
Aug 27 16:52:53 nusi systemd[1]: nut-monitor.service: Can't open PID file
/run/nut/upsmon.pid (yet?) after start: No such file or directory
Aug 27 16:52:53 nusi upsmon[781]: Init SSL without certificate database
Aug 27 16:52:54 nusi upsd[571]: User monmaster at 127.0.0.1 logged into UPS
[APC600]
Aug 27 16:52:54 nusi upsmon[781]: UPS APC600 at localhost battery is low

Strange thing this message
Aug 27 16:52:53 nusi systemd[1]: nut-monitor.service: Can't open PID file
/run/nut/upsmon.pid (yet?) after start: No such file or directory

Because it is /run/nut/upsmon.pid after login exist (and /var/~run too).
Also all three services are up (nut-driver, nut-monitor and nut-server as
I remember).

Also I've tried
# upsc APC600
device.mfr: APC
device.model: Back-UPS
device.type: ups
driver.name: genericups
driver.parameter.pollinterval: 2
driver.parameter.port: /dev/ttyS0
driver.parameter.synchronous: no
driver.parameter.upstype: 2
driver.version: 2.7.4
driver.version.internal: 1.36
ups.mfr: APC
ups.model: Back-UPS
ups.status: LB OL

On old system (Debian 6.x), every thing is OK:
# upsc APC600
device.mfr: APC
device.model: Back-UPS
device.type: ups
driver.name: genericups
driver.parameter.pollinterval: 2
driver.parameter.port: /dev/ttyS0
driver.parameter.upstype: 2
driver.version: 2.4.3
driver.version.internal: 1.36
ups.mfr: APC
ups.model: Back-UPS
ups.status: OL

I have read many thing in documentation /usr/sharte/doc/nut but does not
find a clue. May be that pid file problem still prevent communication
between driver-monitor-server-clinet?

Any suggestion?
  tovis