All technologies

CoAP

2 painsavg 7.5/10
security 1architecture 1

IP multicast lacks encryption standard

8

IP multicast is used for group communication in IoT protocols but has no standard encryption mechanism (DTLS/encryption for IP multicast still unspecified), forcing insecure broadcast or host-based communication only.

securityIPmulticastDTLS+1

REST/CoAP request-response model incompatible with IoT sleepy devices

7

REST-based IoT protocols (CoAP, Thread) require both client and server online simultaneously, incompatible with sleepy IoT devices. Resource discovery via DNS/multicast adds overhead.

architectureCoAPRESTThread+1