[lwip-users] lwip 1.2.0 + freeRTOS

[Sirjee Rooplall]

 

 

 

 

Hi, I am using lwip 1.2.0 under freeRTOS, I am also using PPP + external modem to establish a PPP connection to a server over GPRS.

 

All works well, provided I can establish a connection to the server and the connection is closed.

 

If for some reason the connection is not closed, i.e the TCP/IP stack does not get to the FIN_2 closing state, all hell breaks loose and my system crashes when I attempt to re-connect to the server.

 

I s there an elegant way to remove the connection witout causing future failure.

 

To connect I use:

 

conn = netconn_new(NETCONN_TCP);

netconn_connect(conn, IP, PORT);

vTaskDelay(100); // wait 100ms

 

Then I check the state of the pcb:

if (conn->pcb.tcp->state == ESTABLISHED)

{

  conn->state = NETCONN_CONNECT;

}

else

{

  // CloseConnection();

}

 

void CloseConnection(void)

{

  err_count = 4;
  while( netconn_close( pxSeverConnectionHandle ) != ERR_OK )
  {
     if (--err_count == 0) break;
     vTaskDelay( 10 );
  }
  err_count = 4;

 

  err_count = 4;
  while( netconn_delete( pxSeverConnectionHandle ) != ERR_OK )
  {
     if (--err_count == 0) break;
     vTaskDelay( 10 );
  }

 

  vPortEnterCritical();
  pxSeverConnectionHandle = NULL;
  vPortExitCritical();
}

 

What am I doing wrong in my approach that could be causing this problem.

 

Kind Regards,

 

Sirjee Rooplall
Figment Design laboratories (Pty) Ltd
mailto: address@hidden
Mobile: +27 (0)83 230 8466