[lwip-users] Data sending problem over TCP

[Sanchayan]

Hi,

 

I am trying to implement a web server with lwip on LM3S6965 Stellaris Cortex M3 Micro Controller and also need to sent anywhere from 25 to 4000 bytes of data over TCP from my board. Right now, i am trying to send a few bytes of data, on a switch press over the board, but i am not being able  to send it. I can't see my packets in Wireshark. Below is the code, i have written. Can someone help me out, as to what i am doing wrong or additonal things i need to do. Attached is the wireshark file, when the function gets executed. This is all i get.

 

unsigned char buff[25];

struct tcp_pcb *my_pcb;

void send_my_data( void );
static void close_my_conn( struct tcp_pcb *pcb );

 

void send_my_data( void )                   // This function gets called when i press the switch.
{
     unsigned long myipaddr;

     err_t err;
     err_t write_error;

     struct ip_addr ipaddr; 

     myipaddr = 0x0A110258;  // The IP address 10.17.2.88 to which i need to send the data

     ipaddr.addr = htonl( myipaddr ); 
     buff[0] = 0x31;
     buff[1] = 0x32;
     buff[2] = 0x33;
     buff[3] = 0x34;
     buff[4] = 0x35;
     buff[5] = 0x36;                 // The data i need to send

 

     my_pcb = tcp_new();

 

     tcp_bind( my_pcb, IP_ADDR_ANY, 2101 );                                      // Bind to any local address the board has been assigned

 

     err = tcp_connect( my_pcb, &ipaddr, 2101, NULL );
  
     write_error = tcp_write( my_pcb, buff, 6, 0 );                                     // I Get a return value of 0 for both err and write_error when i check in my Keil debugger for MCU
 
     tcp_output( my_pcb );                                                                    // I need to send the 6 bytes in buff array over TCP
  
     if( ( err == ERR_MEM ) & ( write_error ) )
     {
          close_my_conn( my_pcb ); 
     }      
}
static void close_my_conn( struct tcp_pcb *pcb )
{
    tcp_arg( pcb, NULL );
    tcp_sent( pcb, NULL );
    tcp_recv( pcb, NULL );
    tcp_close( pcb );
}

 

Thanks & Best Regards,
Sanchayan Maity.

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TCP.pcap
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