Constrained Application Protocol

The Constrained Application Protocol (CoAP) is a specialized web transfer protocol, as defined in RFC 7252, for use with constrained nodes and constrained networks in the Internet of Things. The protocol is designed for machine-to-machine (M2M) applications such as smart energy and building automation.

Features

The work on Constrained Environments aims at realizing the REST architecture in a suitable form for the most constrained nodes and networks. The nodes usually consist of 8-bit microcontrollers with limited amounts of RAM and ROM.

CoAP has the following main features:

• Web protocol fulfilling M2M requirements in constrained environments
• UDP [RFC0768] binding with optional reliability supporting unicast and multicast requests
• Asynchronous message exchanges
• Low header overhead and parsing complexity
• URI and Content-type support
• Simple proxy and caching capabilities
• Stateless HTTP mapping
• Security binding to Datagram Transport Layer Security (DTLS)

Courses

• Vertiefendes Wahlfach-Projekt (2018)

References

• RFC 7252: https://tools.ietf.org/html/rfc7252
• CoAP: RFC 7252 Constrained Application Protocol https://coap.technology/
• Learning Internet of Things: https://www.oreilly.com/library/view/learning-internet-of/9781783553532/