Nut upsuser - Jun 2008 - Multiple ups/Belkin 1500VA no serial number

I'm setting up a cluster with multiple ups's using nut 2.2. The
ups's are
Belkin 1500 (ID 050d:0751) which don't appear to report a serial number. Is 
there any other way I can setup ups.conf with multiple of these ups over usb 
on Linux?

If I just setup the vendor and product id's, every definition in ups.conf 
appears to match the first one, and therefore all of them but the first one 
fails. Is there some undocumented matcher I can use to distinguish them, or 
some flag to tell the ups to simple skip ups that have already been matched?

Regards,
Alex Peyser
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> I'm setting up a cluster with multiple ups's using nut 2.2. The
ups's are
> Belkin 1500 (ID 050d:0751) which don't appear to report a serial
number.
> Is there any other way I can setup ups.conf with multiple of these ups
> over usb on Linux?
>
> If I just setup the vendor and product id's, every definition in
ups.conf
> appears to match the first one, and therefore all of them but the first
> one  fails. Is there some undocumented matcher I can use to distinguish
> them, or some flag to tell the ups to simple skip ups that have already
> been matched?
The 'libusb' library doesn't provide the physical port number these
devices are connected to, so if you can't tell them apart through the
regular expressions, this isn't possible. Which in your case means, that
each UPS must have its own USB *root* device, as the only difference will
be the USB bus they're connected to. You can't monitor two devices that
are looking identical from the same USB bus.

Best regards, Arjen
-- 
Eindhoven - The Netherlands
Key fingerprint - 66 4E 03 2C 9D B5 CB 9B  7A FE 7E C1 EE 88 BC 57

Thanks Arjen,

I hadn't previously looked into libusb, but is there a reason why the
filename
member of usb_device is't matched on?  On linux, they may not be unique or 
deterministic in theory --- but in practice they are, particularly for 
servers where you're not constantly plugging in and out devices.

Am I missing something in the logic, or do I just have an unusual case?

I've written up a patch that works for me -- it pulls out the filename from 
the usb_device, and matches it with a file= parameter for ups.conf. I'd
guess
that a better long-term solution would be to have upsdrv listen to hal for 
ups's that are connecting -- but that would obviously be a lot more work,
and
it requires mucking up the server with hal stuff.

Regards,
Alex Peyser

On Thursday 05 June 2008 08:01:32 am 
nut-upsuser-request at lists.alioth.debian.org wrote:
> Message: 1
> Date: Wed, 4 Jun 2008 19:22:56 -0400
> From: Alex Peyser <a.peyser at umiami.edu>
> Subject: [Nut-upsuser] Multiple ups/Belkin 1500VA no serial number
> To: nut-upsuser at lists.alioth.debian.org
> Message-ID: <200806041922.59758.a.peyser at umiami.edu>
> Content-Type: text/plain; charset="us-ascii"
>
> I'm setting up a cluster with multiple ups's using nut 2.2. The
ups's are
> Belkin 1500 (ID 050d:0751) which don't appear to report a serial
number. Is
> there any other way I can setup ups.conf with multiple of these ups over
> usb on Linux?
>
> If I just setup the vendor and product id's, every definition in
ups.conf
> appears to match the first one, and therefore all of them but the first one
> fails. Is there some undocumented matcher I can use to distinguish them, or
> some flag to tell the ups to simple skip ups that have already been
> matched?
>
> Regards,
> Alex Peyser
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> ------------------------------
>
> Message: 2
> Date: Thu, 5 Jun 2008 08:45:11 +0200 (CEST)
> From: "Arjen de Korte" <nut+users at de-korte.org>
> Subject: Re: [Nut-upsuser] Multiple ups/Belkin 1500VA no serial number
> To: "Alex Peyser" <a.peyser at umiami.edu>
> Cc: nut-upsuser at lists.alioth.debian.org
> Message-ID:
> 	<1161.193.67.155.121.1212648311.squirrel at mail.de-korte.org>
> Content-Type: text/plain;charset=iso-8859-1
>
> > I'm setting up a cluster with multiple ups's using nut 2.2.
The ups's are
> > Belkin 1500 (ID 050d:0751) which don't appear to report a serial
number.
> > Is there any other way I can setup ups.conf with multiple of these ups
> > over usb on Linux?
> >
> > If I just setup the vendor and product id's, every definition in
ups.conf
> > appears to match the first one, and therefore all of them but the
first
> > one  fails. Is there some undocumented matcher I can use to
distinguish
> > them, or some flag to tell the ups to simple skip ups that have
already
> > been matched?
>
> The 'libusb' library doesn't provide the physical port number
these
> devices are connected to, so if you can't tell them apart through the
> regular expressions, this isn't possible. Which in your case means,
that
> each UPS must have its own USB *root* device, as the only difference will
> be the USB bus they're connected to. You can't monitor two devices
that
> are looking identical from the same USB bus.
>
> Best regards, Arjen

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