The IESG has approved the following document: - 'CoAP (Constrained Application Protocol) over TCP, TLS, and WebSockets' (draft-ietf-core-coap-tcp-tls-11.txt) as Proposed Standard This document is the product of the Constrained RESTful Environments Working Group. The IESG contact persons are Adam Roach, Alexey Melnikov and Ben Campbell. A URL of this Internet Draft is: https://datatracker.ietf.org/doc/draft-ietf-core-coap-tcp-tls/ Technical Summary The Constrained Application Protocol (CoAP), although inspired by HTTP, was designed to use UDP instead of TCP. The message layer of the CoAP over UDP protocol includes support for reliable delivery, simple congestion control, and flow control. Some environments benefit from the availability of CoAP carried over reliable transports such as TCP or TLS. This document outlines the changes required to use CoAP over TCP, TLS, and WebSockets transports. It also formally updates RFC 7641 for use with these transports and RFC 7959 to enable the use of larger messages over a reliable transport. Working Group Summary The document has gone through multiple expert reviews over the years and was last presented on multiple IETF sessions. The discussion on whether the document should use coaps+ws:// versa coap+wss:// URI scheme was rather protracted, but the WG finally came to a conclusion. The decision to allocate several new URI schemes for different underlying transports has caused some controversy, but was finally settled after a discussion with IESG and URI experts. Document Quality Several vendors are interested in implementing the specification. Personnel Document Shepherd: Jaime Jiménez <jaime.jimenez@ericsson.com> Responsible Area Director: Alexey Melnikov
