Also, it specifies Key Update for OSCORE (KUDOS), a light-weight procedure that two friends can use to update their keying substance and build a new OSCORE Security Context. Esko Dijk, Chonggang Wang, Marco Tiloca, 2022-07-11, This doc specifies the use of the Constrained Application Protocol (CoAP) for group interaction, which include the use of UDP/IP multicast as the default underlying data transportation.