CCS/TM4C129XNCZAD: UDP broadcast messaging on Tiva4C

Farid Marcus

Tool/software: Code Composer Studio

I would like to implement a UDP broadcast on: The PC will broadcast some packet to my TIVA4C MCU. I have been able to communicated so far using UDP messaging between my PC and Tiva using udp_echo.c example. But it does not seem this example works for UDP broadcast. The call back function void udp_echo_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct
ip_addr *addr, u16_t port) just ignore any broadcast message sent from the PC.

Is there any configuration in the stack that I need to enable?

Thank you

over 5 years ago

0 Bob Crosby over 5 years ago

TI__Guru 72500 points

Your question is about LWIP and UDP, not the TM4C microcontroller or the LWIP port itself. As such I am not an expert in that area. You might have more success asking this question on an LWIP forum. Here is some information I found in a google search:

https://stackoverflow.com/questions/44395214/raw-lwip-udp-broadcast

0 Farid Marcus over 5 years ago in reply to Bob Crosby

Prodigy 180 points

Hi Bob,

Thank you for you feedback. I followed the solution suggested in the link you posted, but I still cant receive UDP boardcast messages: I added this line of code below after pcb = udp_new();

ip_set_option(pcb, IP_SOF_BROADCAST);

also changed these

#define IP_SOF_BROADCAST 1

#define IP_SOF_BROADCAST_RECV 1

I hope someone add more feedback to this. This is the first time I am using LWIP.

Thank you all in advance.

0 Bob Crosby over 5 years ago in reply to Farid Marcus

TI__Guru 72500 points

I really cannot help with LWIP details. One of my colleagues knows ethernet better than me, but he is on vacation until Thursday. I will ask him when he gets back.