[lwip-users] uneven UDP transfer

[Huston007]

Hello there.
so look. I use LwIP 1.3.2 on ST32F207 ARM microcontroller. I want to send a
lot of data from ST32 to PC using UDP, in standalone application.

I make a application basic on udp-server demo. Its great work, if _i dont
free the pbuf in udp_receive callback_.

if i add a pbuf_free(p); at end of callback, the data transfer corrupting,
it going to be uneven, fragmentary. This is my code:


//my receive callback:
void udp_echoserver_receive_callback(void *arg, struct udp_pcb *upcb, struct
pbuf *p, struct ip_addr *addr, u16_t port)
{
  //remember the structures to use it in send function
  upcb1 = upcb;
  addr1 = addr;

  parseIncomingMessage(p); //searching for commands in incoming messages

  /* Free the p buffer */

  pbuf_free(p); //this is it! if i use it, it is uneven transmit! If not,
app receive only few messages and going to corrupt
}
And there is my send function:


void udpSendArray(uint16_t data[])
{
        err_t err;
        uint16_t len = udpPackageSize + headerSize;

        struct pbuf *pb = pbuf_alloc(PBUF_TRANSPORT,len, PBUF_REF);
        
        pb->payload = data; 
        
        udp_connect(upcb1, addr1, UDP_CLIENT_PORT);
        err = udp_send(upcb1, pb);
        if(err!=ERR_OK) {
                //do something. But application never enter this block
        }
        udp_disconnect(upcb1);
        pbuf_free(pb);
} 
this function periodically calling from main cycle (main.c):


  while (1)
  {
    /* check if any packet received */
    if (ETH_CheckFrameReceived())
    {
      /* process received ethernet packet */
      LwIP_Pkt_Handle();
    }
    /* handle periodic timers for LwIP */
    LwIP_Periodic_Handle(LocalTime);  
        
        if (full_transmit) udpSendArray(bufADC1);
  }
My code is correct, i think. or not? How to make it work normal? I cant kill
this bug
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