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RFC 7641
Title: Observing Resources in the Constrained
Application Protocol (CoAP)
Author: K. Hartke
Status: Standards Track
Stream: IETF
Date: September 2015
Mailbox: hartke@tzi.org
Pages: 30
Characters: 65842
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-core-observe-16.txt
URL: https://www.rfc-editor.org/info/rfc7641
DOI: http://dx.doi.org/10.17487/RFC7641
The Constrained Application Protocol (CoAP) is a RESTful application
protocol for constrained nodes and networks. The state of a resource
on a CoAP server can change over time. This document specifies a
simple protocol extension for CoAP that enables CoAP clients to
"observe" resources, i.e., to retrieve a representation of a resource
and keep this representation updated by the server over a period of
time. The protocol follows a best-effort approach for sending new
representations to clients and provides eventual consistency between
the state observed by each client and the actual resource state at
the server.
This document is a product of the Constrained RESTful Environments Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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