[lwip-users] Are UDP packets received at tcpip stack in lwip1.3.2 + safeRTOS

[Jin Won Seo]

Hi all,

My project uses StellarisWare+lwip1.3.2+BOOTP+TFTP.

Now I am analyzing lwip1.3.2 codes and if RTOS is used then call tcpip_init(lwIPPrivateInit, 0) in lwiplib.c.

Then tcpip_thread() is called in tcpip.c

Depending on received message's type either ethernet_input() or ip_input() are executed.

sys_mbox_fetch(mbox, (void *)&msg);

    switch (msg->type) {
case TCPIP_MSG_INPKT:
      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: PACKET %p\n", (void *)msg));
#if LWIP_ARP
      if (msg->msg.inp.netif->flags & NETIF_FLAG_ETHARP) {
        ethernet_input(msg->msg.inp.p, msg->msg.inp.netif);
      } else
#endif /* LWIP_ARP */
      {
        ip_input(msg->msg.inp.p, msg->msg.inp.netif);
      }
      memp_free(MEMP_TCPIP_MSG_INPKT, msg);
      break;

case TCPIP_MSG_CALLBACK:
......
......
}

I am not sure once UDP packets are received, they get through this codes. safeRtos seems like only binding tcpip stack, so I am now tracing lwip codes to see if UDP packets can be received from tcpip_init(lwiPPrivateInit,0) in lwip+safeRTOS.

I know UDP and TCP/IP are different, but I don't how I can receive UDP packets using lwip+safeRTOS.

Thanks,
Jin