[6lowapp] draft-shelby-6lowapp-coap-00

[Zach Shelby <[e-mail]>]

Does anyone have comments/ideas regarding http://www.ietf.org/id/draft-shelby-6lowapp-coap-00.txt that we submitted before the holidays? We would like to start some design work, so any feedback would be really useful. I've identified some areas where we need input/discussion on the list:

1. Content-type encoding (Section 2.4). Any ideas or suggestions on how to encode this and what is enough space? How should such an encoding be managed, ask IANA to do that? Any pointers to a similar encoding done elsewhere?

2. Caching (Section 2.6). Should we go towards an in-band or an out-of-band discovery approach? Personally I think an in-band approach is by far the simplest, although it requires some header space when present.

3. Subscribe/Notify (Section 2.7). This is an area that definitely needs discussion. The current proposal is to use a REST interface to create subscriptions and which are then sent using a NOTIFY message to a call-back URL. How to format the body o the subscription (URL to subscribe to, URL call-back, parameters?). 

4. Resource Discovery (Section 2.9). The proposal is to use a new DISCOVER method which can be sent either unicast or multicast. The only difficult part there is the format of the list of resources (URLs) which would be returned in such a response. This is a little bit like index.html. We had some discussions in Hiroshima that XMPP has developed some ways of coding lists of URLs and that could be re-used. Does someone have a pointer for us on that? 

Thanks,
Zach

-- 
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Zach Shelby
Head of Research
Sensinode Ltd.
Kidekuja 2
88610 Vuokatti, FINLAND

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