[lwip-users] Socket API: Only six connections getting Accepted

[saad saeed]

Hello,

I have a problem I am trying to establish multiple connections (9 in my case) with a server which is running on lwIP 2.0.2. My problem is I am trying to do this with Socket API. Following is my code

"

int s;

int n;

struct sockaddr_in addr;

struct sockaddr_in from;

char buff[80];

s=lwip_socket(AF_INET,SOCK_STREAM,0u);

if(s==-1)

{

 PRINTF("Socket not created.\r\n");

}

else

{

  PRINTF("Socket created.\r \n");

   addr.sin_family=AF_INET;

   addr.sin_port=htons(6500);

   addr.sin_addr.s_addr=inet_addr("192.168.1.105");

   if(lwip_bind(s,(struct sockaddr*)&addr,sizeof(addr)) < 0)

   {

       PRINTF("Binding error. \r\n");

   }

 else

 {

    fcntl(s, F_SETFL, O_NONBLOCK);

    PRINTF("Binding recieve.\r \n");

    if (lwip_listen(s,10) == -1)

    {

     PRINTF("Listen error. \r\n");

    }

  else

  {

     PRINTF("Listen successfull. \r\n");

     socklen_t size  =sizeof(from);

     while(1)

     {

      n=lwip_accept(s,(struct sockaddr*) &from, &size);

      if (n > 0)

      {

       PRINTF("Recieved a connection. \r\n");

      }

   }

  }

 }

}

"

But when I do this, I get less than 9 connections accepted, probably around 7 or 6. I have also tried doing this using NETCON API and my code is I got the desired connections accepted.

"

  conn = netconn_new(NETCONN_TCP);

  netconn_bind(conn, IP_ADDR_ANY, 6500);

  LWIP_ERROR("tcpecho: invalid conn", (conn != NULL), return;);

netconn_listen(conn);

  while (1) {

    err = netconn_accept(conn, &newconn);

    if (err == ERR_OK) {

      PRINTF("accepted new connection %p \r\n", newconn);

    }

  }

"

For convenience, I am attaching my lwip_opt.h and opt.h files. Please, help me with this.

Kind Regards,

Saad.

lwipopts.h
Description: lwipopts.h

opt.h
Description: opt.h