Subject: [core] 转发: New Version Notification for draft-li-core-conditional-observe-02.txt

From: Lishitao <[email-masked]>
Date: Fri, 8 Jun 2012 07:55:50 +0000

Hi all

I have submitted a new version of draft-li-core-conditional-observe-02 for conditional observe. 
The url can be find at http://datatracker.ietf.org/doc/draft-li-core-conditional-observe/

The main change for this version is about :

1, changing the structure of the Condition option, adding two flag in this option, one for reliability control, one for indicating value type

2, adding more condition types

3, indicating a new mechanism for cancellation

4, introducing a new option keep-alive, when server using NON message for notification, the server will not know whether the client is still an observer(in case the client suffer some traffic problem), and Pledge option defined in bormann-coap-misc cannot handle this, so a new keep-alive option is suggested for a client to use can let the server to confirm whether it is still an observer

5, in the annex, also suggests some other mechanisms that would be helpful for implementing COAP, one is the cancellation flag, another one is logic flag. Cancellation flag is another way that can be used to remove one of the existing condition from the observe relationship. Logic flag can be used to define the logic(AND or OR) between different conditions that shows in one observe request. Anyone interested in this parts can see the detail in the draft. 

Any comments are helpful! 

Regards
shitao
-----邮件原件-----
发件人: [email-masked] [mailto:[email-masked]] 
发送时间: 2012年6月8日 15:11
收件人: Lishitao
抄送: [email-masked]; [email-masked]
主题: New Version Notification for draft-li-core-conditional-observe-02.txt

A new version of I-D, draft-li-core-conditional-observe-02.txt has been successfully submitted by Shitao Li and posted to the IETF repository.

Filename:	 draft-li-core-conditional-observe
Revision:	 02
Title:		 Conditional observe in CoAP
Creation date:	 2012-06-08
WG ID:		 Individual Submission
Number of pages: 23

Abstract:
   CoAP is a RESTful application protocol for constrained nodes and
   networks.  Through the Observe option, clients can observe changes in
   the state of resources and obtain a current representation of the
   last resource state.  This document defines a new mechanism in CoAP
   Observe so that a CoAP client can conditionally observe a resource on
   a CoAP server, only being informed about state changes meeting a
   specific condition or set of conditions.  This offers possibilities
   to extend network intelligence, enhance scalability, and optimize the
   lifetime and performance in order to address the requirements from
   the Constrained Nodes and Networks.

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