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The Constrained Application Protocol (CoAP) (RFC7252)

IP.com Disclosure Number: IPCOM000237605D
Original Publication Date: 2014-Jun-01
Included in the Prior Art Database: 2014-Jun-27

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

Z. Shelby: AUTHOR [+3]


The use of web services (web APIs) on the Internet has become ubiquitous in most applications and depends on the fundamental Representational State Transfer [REST] architecture of the Web.

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Internet Engineering Task Force (IETF)                         Z. Shelby Request for Comments: 7252                                           ARM Category: Standards Track                                      K. Hartke ISSN: 2070-1721                                               C. Bormann                                                  Universitaet Bremen TZI                                                                June 2014

               The Constrained Application Protocol (CoAP)


   The Constrained Application Protocol (CoAP) is a specialized web    transfer protocol for use with constrained nodes and constrained    (e.g., low-power, lossy) networks.  The nodes often have 8-bit    microcontrollers with small amounts of ROM and RAM, while constrained    networks such as IPv6 over Low-Power Wireless Personal Area Networks    (6LoWPANs) often have high packet error rates and a typical    throughput of 10s of kbit/s.  The protocol is designed for machine-    to-machine (M2M) applications such as smart energy and building    automation.

   CoAP provides a request/response interaction model between    application endpoints, supports built-in discovery of services and    resources, and includes key concepts of the Web such as URIs and    Internet media types.  CoAP is designed to easily interface with HTTP    for integration with the Web while meeting specialized requirements    such as multicast support, very low overhead, and simplicity for    constrained environments.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at    http://www.rfc-editor.org/info/rfc7252.

 Shelby, et al.               Standards Track                    [Page 1]
 RFC 7252       The Constrained Application Protocol (CoAP)     June 2014

 Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    (http://trustee.ietf.org/license-info) in effect on the date of    publication of this document.  Please...