lwip binds only the first time

biafra — Tue, 07 Mar 2017 16:18:18 GMT

Hi everyone,

I'm working on a custom board using MK65FX1M0VM18 device with KSDK 2.1.

The application works fine but there is a problem that stops me: a task is a TCP server that receives connection and commands from the network. When the application runs I can successful connect to the server and send the commands that are executed. But if I disconnect and try to connect again, I cannot connect until the board is reset.

This is some snippet of code:

while( 1 )

{

sock = socket( AF_INET, SOCK_STREAM, 0 );

if( sock < 0 )

{

/* error */

}

      memset( &socka, 0, sizeof( socka ));
      socka.sin_family = AF_INET;
      socka.sin_port = htons( SOCKET_PORT );
      socka.sin_addr.s_addr = htonl( INADDR_ANY );

if( bind( sock, ( struct sockaddr * )&socka, sizeof( socka )) < 0 )

{

/* error */

}

if( listen( sock, 5 ) < 0 )
{

/* error */

}

socksize = sizeof( socka );

      conn = accept( sock, ( struct sockaddr * )&socka, &socksize );
      if( conn == < 0 )
      {

/* error */

}

while( recv( conn, buff_cmd, sizeof( buff_cmd ), 0 ) > 0 )

{

/* execute commands */

if( command == disconnect )

break;

}

shutdown( conn, SHUT_RDWR );

shutdown( sock, SHUT_RDWR );

}

The first cycle everything is ok: the command processing is working fine. When I send the disconnect command, the command is executed and the two shutdown() function are called. The cycle is then repeated: the socket() function is executed fine, but the following bind() function exits with negative code (fails).

Which is the reason for this behaviour?

Is there anyone that can point me in the right direction?

Many thanks

Biafra

Re: lwip binds only the first time

xiangjun_rong — Mon, 13 Mar 2017 09:26:34 GMT

Hi, Francesco,

Can you debug the code to chevk which line fails ? how about resetting the ethernet module?

Xiangjun Rong

topic lwip binds only the first time in Kinetis Software Development Kit

lwip binds only the first time

Re: lwip binds only the first time