The IESG has approved the following document: - 'Constrained Application Protocol (CoAP)' (draft-ietf-core-coap-18.txt) as Proposed Standard This document is the product of the Constrained RESTful Environments Working Group. The IESG contact persons are Barry Leiba and Pete Resnick. A URL of this Internet Draft is: http://datatracker.ietf.org/doc/draft-ietf-core-coap/ Technical Summary 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 6LoWPAN 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 resources, and includes key concepts of the Web such as URIs and Internet media types. CoAP easily interfaces with HTTP for integration with the Web while meeting specialized requirements such as multicast support, very low overhead and simplicity for constrained environments. Working Group Summary WG review has been intense, with input from many participants beyond the document authors, and particularly input from implementers. There are no particular controversies to note. Document Quality There have been multiple expert reviews, from security, applications (once a general review, and once specifically on the URI schema), and transport areas. All the reviews produced useful input, that resulted in significant changes to the specification. All review feedback is now incorporated in the final document. There are at least 15 publically disclosed implementations, both commercial and open-source. There have been several interoperability events, and a high level of interoperability has been reported from those events. Personnel Document Shepherd is Andrew McGregor <andrewmcgr@google.com> Responsible Area Director is Barry Leiba <barryleiba@computer.org> Zach Shelby <zach@sensinode.com> is suggested as the designated expert for the IANA registries defined in Sections 12.2 and 12.3.
