A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : CoAP Endpoint Identification
Author : Oliver Kleine
Filename : draft-kleine-core-coap-endpoint-id-00.txt
Pages : 12
Date : 2014-04-02
Abstract:
The Constrained Application Protocol (CoAP) is an application layer
protocol for constrained devices (e.g.low power, few memory) and
networks (e.g. lossy, low bandwidth) which relies on UDP on the
transport layer. With CoAP it is often the case, that message
exchanges need to extend the common request/response pattern, e.g.
for seperate responses. This holds, e.g. for CON requests that are
confirmed by the server with an empty ACK and answered later with a
seperate response. According to the CoAP specification the request/
response matching is realized using a unique pair of server address
and token per client.
Due to the mobile nature of some devices. e.g. smartphones, they are
often assigned new IP addresses because of a network change. Thus,
the IP address of a CoAP server might change during an ongoing
conversion. This draft proposes a method to assign each
communication partner with an identifier (endpoint ID) which replaces
the IP address as (partial) key to relate requests and responses.
Besides the common seperate responses, the proposed method is also
useful to handle IP address changes, e.g. during an ongoing
observation ([observe]) or a blockwise transfer ([block]).
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-kleine-core-coap-endpoint-id/
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-kleine-core-coap-endpoint-id-00
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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