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Description
This is needed for todbot/CircuitPython_MicroOSC#1
It appears this is enabled at the lwip library level but needs to be enabled at the socketpool layer, a la the lwip_setsockopt_impl implementation which says:
case IP_MULTICAST_TTL:
LWIP_SOCKOPT_CHECK_OPTLEN_CONN_PCB_TYPE(sock, optlen, u8_t, NETCONN_UDP);
udp_set_multicast_ttl(sock->conn->pcb.udp, (u8_t)(*(const u8_t *)optval));
break;