RE: [gupnp] [PATCH] Respond to M-SEARCH requests for urns specifying an eligible version

[Stephen Depooter <stephend xandros com>]

If I have a device that implements versions 1, 2, and 3 of Media Server, and as per section 2.3 of the spec, includes and declares version 3 as the "highest supported version" of the MediaServer device type, then only the versions 1, 2, and 3 of MediaServer are supported.  Clearly the device must respond to any search request for a MediaServer on the network when the request is for a supported version.  Since by definition version 4, 5 and 6 have new functionality compared to versions 1,2 or 3, then they are not supported.  Thus any request for a version 4, 5, or 6 is not supported and should not be responded to.  Since the control point that is dong the searches receives no responses, it MAY fall back and search for a lower version if it is behaving according to the details of the 1.3.2 section of the spec.  Clearly the expectation is that if a control point is requesting a version of a device that is not supported it will not get flooded by irrelevant responses by every device that happens to implement only lower versions of the spec.

Any without providing a copy of the UPNP standards test tool, I can't hit you with the clue bat that clearly shows the expected behaviour as tested by the standards committee.  As written, the section 1.3.2 of version 1.1 of the UPNP standard, does not say that a device MUST not respond to any goddamned irrelevant M-SEARCH request, it only says that it must respond to requests for devices/services that ARE SUPPORTED.

I don't know how the DLNA certification body's test tool tests this aspect or even if it tests this, but if you want to support UPNP body certification, then you need to pass the UPNP standards body's test tool.

And with that, I'm done.  I won't waste anymore of my time trying to get this patch set accepted, feel free to merge the changes from the posted m-search branch on gitorious.

http://gitorious.org/gupnp/gssdp/merge_requests/1




Stephen Depooter



----- Original Message -----
From: "Zeeshan Ali (Khattak)" <zeenix gmail com>
Sent: Mon, 7/12/2010 5:35pm
To: "Stephen Depooter" <stephend xandros com>
Cc: gupnp o-hand com
Subject: Re: [gupnp] [PATCH] Respond to M-SEARCH requests for urns specifying an eligible version

Hi,

On Mon, Jul 12, 2010 at 10:19 PM, Stephen Depooter <stephend xandros com> wrote:
>
> Specifically the device must respond for any supported version.  Since the
> device clearly states in the description the highest supported version of a
> device or service implemented by the software, it must not respond to
> M-SEARCH queries for higher versions that the "highest supported version"

   That is exactly what i want to know: Where does the specs say this
"must not respond to M-SEARCH queries for higher versions"? I don't
see this requirement anywhere in the text your referred to and/or
pasted so far.

-- 
Regards,

Zeeshan Ali (Khattak)
FSF member#5124
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