Nut upsuser - Apr 2025 - Salicru SPS One eventually loses connection

Hi,

I have a Saclicru SPS One 900VA. This is a warranty replacement for an 
earlier SPS One 900, except the first was a model with UK plugs, and 
this one is with IEC.

The first one used to work perfectly with the existing NUT 
configuration. With the new unit, although NUT starts and works for a 
while, eventually it stops working with a "stale data" message. I have
checked the FAQ and I can't quite figure out if the section on stale 
data applies.

I isolated the driver to get cleaner debug messages, and have provided 
them below. Once the stale message occurs, the only way to fix things is 
by rebooting the host running NUT (and connected to the UPS via USB).

Unfortunately I haven't yet been able to see the output at the time the 
data becomes stale (terminal buffer not big enough). I can try piping it 
to a file.

The output using -DD:

https://pastebin.com/y5ZNXZ55

I think this points to a change in the software in the UPS, but is there 
a way to work around this?

Many thanks

Further requested information:

OS: Linux host 6.1.0-32-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.129-1 
(2025-03-06) x86_64 GNU/Linux
NUT: nut/stable,now 2.8.0-7 all
Install method: Debian repo install (apt)

Thanks

On 10/04/2025 16:44, S Shaikh wrote:
> Hi,
>
> I have a Saclicru SPS One 900VA. This is a warranty replacement for an 
> earlier SPS One 900, except the first was a model with UK plugs, and 
> this one is with IEC.
>
> The first one used to work perfectly with the existing NUT 
> configuration. With the new unit, although NUT starts and works for a 
> while, eventually it stops working with a "stale data" message. I
have
> checked the FAQ and I can't quite figure out if the section on stale 
> data applies.
>
> I isolated the driver to get cleaner debug messages, and have provided 
> them below. Once the stale message occurs, the only way to fix things 
> is by rebooting the host running NUT (and connected to the UPS via USB).
>
> Unfortunately I haven't yet been able to see the output at the time 
> the data becomes stale (terminal buffer not big enough). I can try 
> piping it to a file.
>
> The output using -DD:
>
> https://pastebin.com/y5ZNXZ55
>
> I think this points to a change in the software in the UPS, but is 
> there a way to work around this?
>
> Many thanks

S Shaikh via Nut-upsuser <nut-upsuser at alioth-lists.debian.net> writes:
> I isolated the driver to get cleaner debug messages, and have provided
> them below. Once the stale message occurs, the only way to fix things
> is by rebooting the host running NUT (and connected to the UPS via
> USB).
>
> Unfortunately I haven't yet been able to see the output at the time
> the data becomes stale (terminal buffer not big enough). I can try
> piping it to a file.
My guess is that there is a USB-level disconnect and this is a problem
between your UPS and your computer more than a nut problem.

I would try a different port and a different cable.  I would look at
kernel dmesg.  If you see disconnect there, I would leave it without nut
running and see if it disconnects.

In situations where you think you have to reboot, you might also try
unplugging UBS cable, waiting 10s, and replugging.

Depending on the OS, a software USB reset request is also an option.

Jim

On Thu, Apr 10, 2025, 19:17 S Shaikh via Nut-upsuser <
nut-upsuser at alioth-lists.debian.net> wrote:
> Hi,
>
> I have a Saclicru SPS One 900VA. This is a warranty replacement for an
> earlier SPS One 900, except the first was a model with UK plugs, and
> this one is with IEC.
>
> The first one used to work perfectly with the existing NUT
> configuration. With the new unit, although NUT starts and works for a
> while, eventually it stops working with a "stale data" message. I
have
> checked the FAQ and I can't quite figure out if the section on stale
> data applies.
>
> I isolated the driver to get cleaner debug messages, and have provided
> them below. Once the stale message occurs, the only way to fix things is
> by rebooting the host running NUT (and connected to the UPS via USB).
>
> Unfortunately I haven't yet been able to see the output at the time the
> data becomes stale (terminal buffer not big enough). I can try piping it
> to a file.
>
> The output using -DD:
>
> https://pastebin.com/y5ZNXZ55
>
> I think this points to a change in the software in the UPS, but is there
> a way to work around this?
>
> Many thanks
>
> _______________________________________________
> Nut-upsuser mailing list
> Nut-upsuser at alioth-lists.debian.net
> https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser
>
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