| lwIP
    2.1.2
    Lightweight IP stack | 
#include <raw.h>
| Data Fields | |
| u8_t | mcast_ifindex | 
| u8_t | mcast_ttl | 
| raw_recv_fn | recv | 
the RAW protocol control block
| u8_t raw_pcb::mcast_ifindex | 
outgoing network interface for multicast packets, by interface index (if nonzero)
| u8_t raw_pcb::mcast_ttl | 
TTL for outgoing multicast packets
| raw_recv_fn raw_pcb::recv | 
receive callback function