A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Stateful Observation in CoAP
Author(s) : Changsha Ma
Peilin Hong
Kaiping Xue
Filename : draft-ma-core-stateful-observe-00.txt
Pages : 16
Date : 2012-07-29
Abstract:
The Observe Option allows a CoAP client to observe changes in the
state of resources and obtain a current representation of the last
resource state. To be an observer of an origin server's rescourses,
the client is required to register its interest with the server. A
successful registration will make the client added into the server's
observation list, while a failed one may drive the client to re-
register.
However, even repeated and frequent re-registrations cannot guarantee
the client to eventually become an observer of the target server. In
the case that the server is unable or unwilling to accept an
observer, the time-intensive re-registrations will just bring
redundant messages in the constrained network and considerable energy
consumption on both the client and the server.
This memo defines a new CoAP option, State, for providing stateful
observation on the resources of CoAP servers. By observing the state
of the server in terms of the Observe Option, a client can explicitly
judge when the server will not actively reject an observation
registration, and wisely performs the re-registration. This avoids
the potential registration flooding that causes considerable network
overhead and energy consumption on the constrained nodes.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ma-core-stateful-observe
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ma-core-stateful-observe-00
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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