Re: [core] Fwd: New Version Notification for draft-hartke-coap-observe-00

Klaus,

A few agreements in-line.

On Jun 24, 2010, at 8:52 PM, Klaus Hartke wrote:

> On 23 June 2010 17:24, Zach Shelby <zach@sensinode.com> wrote:

>> - Are we sure we need all the requirements here, or are some nice-to-have?
> 
> I believe that all requirements are needed to implement the
> architecture. Whether all elements of the architecture are needed,
> should be discussed.

Good point. 

> 
>> For example: "A subscribing client must be able to influence the representation format in which the server supplies the resource state" I would hope this doesn't end up resulting in a bunch of Accept: style headers? Couldn't that be left to the application to offer URLs with different representation formats? I am not convinced this should be a transfer protocol requirement for CoAP.
> 
> I think both options (/sensors/temperature.xml or Accept:
> application/xml) are valid ways to satisfy this requirement. If we go
> with the Accept header, we need to add a new option to CoAP. I'm in
> favour of .xml in the URL.

+1

> 
> There is another requirement related to the representation format,
> which is probably more important: "The representation format used
> during the lifetime of a subscription must not change." I think this
> is a requirement that should be stated somewhere.

+1

> 
>> - SUBSCRIBE, UNSUBSCRIBE, YIELD, BREAK, THROW are abstract concepts at this point, I would think these could be combined quite a bit in realization? What kind of realization do you guys have in mind (just for a sneak preview to see if this is nuts or not).
> 
> Carsten and I are working on concrete message types. The result will
> probably not be that different from what we have in coap-00 currently.

Yep, this is what I thought. 

Zach

> 
> Klaus
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-- 
Zach Shelby, Chief Nerd, Sensinode Ltd.
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