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IPv4 Multicasting

µC/TCP-IP supports IP IPv4 multicasting with IGMP. In order to receive packets addressed to a given IP IPv4 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.

Anchor10948921094892The following examples show how to join and leave an IP IPv4 multicast group with µC/TCP-IP:anchor

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NET_IP_ADDR  group_ip_addr;

NET_ERR

      err;
 
 
if_nbr        = NET_IF_NBR_BASE_CFGD;

group_ip_addr = NetASCII_Str_to_IP(

"233.0.0.

1", &err);

if (err != NET_ASCII_ERR_NONE)

 {
  /* Handle error. */

}
NetIGMP_HostGrpJoin(if_nbr, group_ip_addr, &err);

if (err != NET_IGMP_ERR_NONE)

 {
  /* Handle error. */

}
[...]

NetIGMP_HostGrpLeave(if_nbr, group_ip_addr, &err);

if (err != NET_IGMP_ERR_NONE)

 {
  /* Handle error. */

}

NET_IF_NBR   if_nbr;

IPv6 Multicasting

µC/TCP-IP supports IPv6 multicasting with MLDP. In order to receive packets addressed to a given IPv6 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:

NET_IF_NBR     if_nbr;
NET_IPv6_ADDR  group_ip_addr;
NET_ERR        err;
 
 
if_nbr        = NET_IF_NBR_BASE_CFGD;
group_ip_addr = NetASCII_Str_to_IP("FF03::1", &err);
if (err != NET_ASCII_ERR_NONE) {
  /* Handle error. */
}
NetMLDP_HostGrpJoin(if_nbr, group_ip_addr, &err);
if (err != NET_MDLP_ERR_NONE) {
  /* Handle error. */
}
[...]
NetMLDP_HostGrpLeave(if_nbr, group_ip_addr, &err);
if (err != NET_MDLP_ERR_NONE) {
  /* Handle error. */
}