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Altera_Forum's avatar
Altera_Forum
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20 years ago

LWIP broadcast

Hello, I have set up NIOS w/LWIP as UDP client. Addresses are fixed, not using DHCP. I can send and receive okay to fixed IP addresses, but LWIP will not receive a packet when the server sets th...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

I have developed my own patch that appears to solve the problem. In file udp.c, line 216, replace

ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest)))) {

with

ip_addr_cmp(&(pcb->local_ip), &(iphdr->dest))) ||

ip_addr_isbroadcast(&iphdr->dest, inp) ) {

effectively adding a check for broadcast to one of the many checks of the packet control block. I am not sure this is rigorously correct, but appears to work. Comments invited.

Regards,

Tim