Re: [lwip-users] UDP bind error due to address and port reuse

[Dirk Ziegelmeier]

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 *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port)
{

   [create new pbuf with response]

   udp_sendto(pcb, response_pbuf, addr, port);

​}

​Dirk
​