On Sun, 24 May 2020, Péter Szabados wrote:
I have an APC Back-UPS ES 550G. I use the usbhid-ups driver, which works fine
most of the time. However, after a few hours of running, it starts to
broadcast messages on the network that the UPS is not available, and any
attempted queries will return "Data stale". Restarting the driver solves the
problem, at least for the next few hours.
This is a regular question in this list, and it looks as if fixing the problem
will require some detective work, and detailed tracing.
What does command lsusb report for the your APC Back-UPS ES 550G? Is this
idVendor and idProduct in /usr/lib/udev/rules.d/62-nut-usbups.rules ?
In general, should users expect a usb UPS unit to work correctly if the unit is
not in the 62-nut-usbups.rules file? Does permanent "Data stale" occur even for
units that are in that file?
Have you tried increasing MAXAGE in upsd.conf as described in the FAQ
https://networkupstools.org/docs/FAQ.html#_what_8217_s_this_about_emphasis_data_stale_emphasis
Roger
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