igmp_join

#include <rtl.h>

BOOL igmp_join (
    U8  *group_ip);     /* IP Address of the Host Group. */

The igmp_join function requests that this host become a member of the host group identified by group_ip. Before any datagrams destined to a particular group can be received, an upper-layer protocol must ask the IP module to join that group.

The igmp_join function is in the RL-TCPnet library. The prototype is defined in rtl.h.

The igmp_join function returns __TRUE when this host successfully joined a host group. Otherwise, the function returns __FALSE.

igmp_leave, udp_mcast_ttl, udp_send

U8 sgroup[4] = { 238, 0, 100, 1};
 ..
if (igmp_join (sgroup) == __TRUE) {
  printf ("This Host is a member of group: %d.%d.%d.%d\n",
           sgroup[0],sgroup[1],sgroup[2],sgroup[3]);
}
else {
  printf ("Failed to join a host group.\n");
}
 ..