Multicast allows a single client to communicate with a group of servers simultaneously, which is essential for IoT scenarios like turning off all lights in a room or discovering available services on a network (#2).
Refer to https://datatracker.ietf.org/doc/html/rfc7252#section-8
See also https://pmc.ncbi.nlm.nih.gov/articles/PMC4970179/
Multicast allows a single client to communicate with a group of servers simultaneously, which is essential for IoT scenarios like turning off all lights in a room or discovering available services on a network (#2).
Refer to https://datatracker.ietf.org/doc/html/rfc7252#section-8
See also https://pmc.ncbi.nlm.nih.gov/articles/PMC4970179/