Extended Tokens and Stateless Clients in the Constrained Application Protocol (CoAP)
This document provides considerations for alleviating Constrained Application Protocol (CoAP) clients and intermediaries of keeping per-request state. To facilitate this, this document additionally introduces a new, optional CoAP protocol extension for extended token lengths.
This document updates RFCs 7252 and 8323 with an extended definition of the "TKL" field in the CoAP message header.