The Constrained Restful Environments (CoRE) Working Group is an IETF working that provides a framework for REST applications intended to run on constrained IP networks.
You can see the current drafts on the CoRE WG Github as well as join the mailing list to participate. Presentations, agendas and minutes from past meetings can be found in the WG Materials repository.
We will be having virtual interim meetings every other week starting from 2024-08-28 until IETF 121.
We will meet at IETF 121, on 2024-11-05 at 09:30-11:30 UTC
There is a number of available implementations of CoAP.