The Constrained Application Protocol (CoAP) (RFC7252)
Original Publication Date: 2014-Jun-01
Included in the Prior Art Database: 2014-Jun-27
Internet Society Requests For Comment (RFCs)
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.
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
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