Use one UDP PCB, bind it to IPADDR_ANY and port x. Use udp_sendto() to send to any IP/port combination. http://www.nongnu.org/lwip/2_0_0/group__udp__raw.html
You get the src address/port of any request in your receive callback: void my_udp_recv_fn (void *arg, struct udp_pcb <http://www.nongnu.org/lwip/2_0_0/structudp__pcb.html> *pcb, struct pbuf <http://www.nongnu.org/lwip/2_0_0/structpbuf.html> *p, const ip_addr_t <http://www.nongnu.org/lwip/2_0_0/group__ipaddr.html#ga44f9ada14c65d17aecf802d82eb273c5> *addr, u16_t port) { [create new pbuf with response] udp_sendto(pcb, response_pbuf, addr, port); } Dirk
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