[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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