| lwIP
    2.1.2
    Lightweight IP stack | 
| Macros | |
| #define | LWIP_IPV6_MLD LWIP_IPV6 | 
| #define | MEMP_NUM_MLD6_GROUP 4 | 
| #define LWIP_IPV6_MLD LWIP_IPV6 | 
LWIP_IPV6_MLD==1: Enable multicast listener discovery protocol. If LWIP_IPV6 is enabled but this setting is disabled, the MAC layer must indiscriminately pass all inbound IPv6 multicast traffic to lwIP.
| #define MEMP_NUM_MLD6_GROUP 4 | 
MEMP_NUM_MLD6_GROUP: Max number of IPv6 multicast groups that can be joined. There must be enough groups so that each netif can join the solicited-node multicast group for each of its local addresses, plus one for MDNS if applicable, plus any number of groups to be joined on UDP sockets.