CoAP

The IETF Constrained RESTful Environments (CORE) working group [CORE WG] has defined the Constrained Application Protocol (CoAP) [CoAP] which easily translates to HTTP for integration with the web, while meeting specialized requirements

such as: multicast support, very low overhead, and simplicity for constrained environments. CoAP has been designed as a generic protocol for LLNs taking into account the features of the underlying architecture [CoAParchitecture]. The CORE working group, instead of blindly making a compression of HTTP, defined a subset of the RESTful specification, making it interoperable with HTTP but also specializing it for so constrained environments. Briefly, the main features addressed by CoAP are:

·       Constrained web protocol specialized to M2M requirements.

·       Stateless HTTP mapping through the use of proxies or direct mapping of HTTP interfaces to CoAP.

·       UDP transport with application layer reliable unicast and best-effort multicast support.

·       Asynchronous message exchanges.

·       Low header overhead and parsing complexity.

·       URI and Content-type support.

·       Simple proxy and caching capabilities.

·       Optional resource discovery.

 

References

[CORE WG] http://datatracker.ietf.org/wg/core/charter/

[CoAP] Z. Shelby, K. Hartke, C. Bormann, and B. Frank, The Constrained Application Protocol (CoAP), RFC7252, June 2014

[CoAParchitecture] C. Bormann, A. P. Castellani, and Z. Shelby, “CoAP: An Application Protocol for Billions of Tiny Internet Nodes,” IEEE Internet Computing, vol. 16, no. 2, pp. 62–67, 2012.

Welcome to IoT6 website!

IoT6 is a 3 years FP7 European research project on the future Internet of Things. It aims at exploring the potential of IPv6 and related standards (6LoWPAN, CORE, COAP, etc.) to overcome the current shortcomings and fragmentation of the Internet of Things. We are pleased to present you our project and to share with you some IoT and IPv6-related resources and documents, including our IoT6 SME handbook.

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