https://datatracker.ietf.org/doc/draft-kovatsch-lwig-coap/02/
draft-kovatsch-lwig-coap-02 - CoAP Implementation Guidance
The Constrained Application Protocol (CoAP) is designed for resource- constrained nodes and networks, e.g., sensor nodes in a low-power lossy network (LLN)....
draftcoapimplementationguidance