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Status:

PROPOSED STANDARD

Updated by:

RFC 8323

Author:

K. Hartke

Stream:

IETF

Source:

core (wit)

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DOI:  https://doi.org/10.17487/RFC7641

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Abstract

The Constrained Application Protocol (CoAP) is a RESTful applicationprotocol for constrained nodes and networks. The state of a resourceon a CoAP server can change over time. This document specifies asimple protocol extension for CoAP that enables CoAP clients to"observe" resources, i.e., to retrieve a representation of a resourceand keep this representation updated by the server over a period oftime. The protocol follows a best-effort approach for sending newrepresentations to clients and provides eventual consistency betweenthe state observed by each client and the actual resource state atthe server.

For the definition ofStatus,seeRFC 2026.

For the definition ofStream, seeRFC 8729.