| lwIP
    2.0.3
    Lightweight IP stack | 
| Macros | |
| #define | LWIP_UDP 1 | 
| #define | LWIP_UDPLITE 0 | 
| #define | UDP_TTL (IP_DEFAULT_TTL) | 
| #define | LWIP_NETBUF_RECVINFO 0 | 
| #define LWIP_NETBUF_RECVINFO 0 | 
LWIP_NETBUF_RECVINFO==1: append destination addr and port to every netbuf.
| #define LWIP_UDP 1 | 
LWIP_UDP==1: Turn on UDP.
| #define LWIP_UDPLITE 0 | 
LWIP_UDPLITE==1: Turn on UDP-Lite. (Requires LWIP_UDP)
| #define UDP_TTL (IP_DEFAULT_TTL) | 
UDP_TTL: Default Time-To-Live value.