IPv4
µC/TCP-IP supports IP IPv4 multicasting with IGMP. In order to receive packets addressed to a given IP multicast group address, the stack must have been configured to support multicasting in net_cfg.h, and Multicast Configuration, and that host group has to be joined.
The following examples show how to join and leave an IPv4 multicast group with µC/TCP-IP:
IPv6
µC/TCP-IP supports IPv6 multicasting with MLDP. In order to receive packets addressed to a given IP multicast group address, With IPv6 MLDP is always enabled but you might need to increase the number of group, see Multicast Configuration.
The following examples show how to join and leave an IPv6 multicast group with µC/TCP-IP: