Echo and Request-Tag
Göran Selander, Christian Amsà ⁄ ss, John Mattsson · 2018
This document specifies security enhancements to the Constrained Application Protocol (CoAP). Two optional extensions are defined: the Echo option and the Request-Tag option. Each of these options provide additional features to CoAP and protects against certain attacks. The document also updates the processing requirements on the Token of RFC 7252. The updated Token processing ensures secure binding of responses to requests.