tse transmission get hanged in TCP protocal

Here is my changed simple_socket_sever.c

# include <stdio.h>
# include <string.h>
# include <ctype.h> 
# include "includes.h"
# include "simple_socket_server.h"                                                                    
# include "alt_error_handler.h"
# include "ipport.h"
# include "tcpport.h"
 
void sss_reset_connection(SSSConn* conn)
{
  memset(conn, 0, sizeof(SSSConn));
  conn->fd = -1;
  conn->state = READY;
  conn->rx_wr_pos = conn->rx_buffer;
  conn->rx_rd_pos = conn->rx_buffer;
  return;
}
void sss_handle_accept(int listen_socket, SSSConn* conn)
{
  int                 socket, len;
  struct sockaddr_in  incoming_addr;
  alt_u8 sendBuf;
  alt_u8 *send_ptr = sendBuf;
  len = sizeof(incoming_addr);
  if ((conn)->fd == -1)
  {
     if((socket=accept(listen_socket,(struct sockaddr*)&incoming_addr,&len))<0)
     {
         alt_NetworkErrorHandler(EXPANDED_DIAGNOSIS_CODE,
                                 " accept failed");
     }
     else
     {
        (conn)->fd = socket;
        //sss_send_menu(conn);
        send_ptr += sprintf(send_ptr,"Connected OK!\n\r"); 
        send_ptr += sprintf(send_ptr,inet_ntoa(incoming_addr.sin_addr));
        send_ptr += sprintf(send_ptr,"\n\r");
        send(conn->fd, sendBuf, send_ptr-sendBuf, 0);
        printf(" accepted connection request from %s\n",
               inet_ntoa(incoming_addr.sin_addr));
     }
  }
  else
  {
    printf(" rejected connection request from %s\n",
           inet_ntoa(incoming_addr.sin_addr));
  }
  return;
}
void sss_handle_receive(SSSConn* conn)
{
    
    char Buf;
    memset(Buf,0,10);
    //OSTimeDlyHMSM(0,0,1,0);
    
    recv(conn->fd,Buf,2,0);
    printf("%s\nrecieved OK!\n\n",Buf);
    
    //OSTimeDlyHMSM(0,0,1,0);
      
    send(conn->fd,"2",2,0);
    printf("2 sent OK!\n\n");  
  
  return;
}
void SSSSimpleSocketServerTask()
{
  int fd_listen, max_socket; 
  struct sockaddr_in addr;
  static SSSConn conn;
  fd_set readfds; 
    
  if ((fd_listen = socket(AF_INET, SOCK_STREAM, 0)) < 0)
  {
    alt_NetworkErrorHandler(EXPANDED_DIAGNOSIS_CODE," Socket creation failed");
  }
  
  addr.sin_family = AF_INET; 
  addr.sin_port = htons(SSS_PORT); //SSS_PORT=30 &#65288;simple_socket_server.h&#65289;
  addr.sin_addr.s_addr = INADDR_ANY; 
  
  if ((bind(fd_listen,(struct sockaddr *)&addr,sizeof(addr))) < 0)
  {
    alt_NetworkErrorHandler(EXPANDED_DIAGNOSIS_CODE," Bind failed");
  }
    
  if ((listen(fd_listen,1)) < 0)
  {
    alt_NetworkErrorHandler(EXPANDED_DIAGNOSIS_CODE," Listen failed");
  }
  sss_reset_connection(&conn);
  printf(" Simple Socket Server listening on port %d\n", SSS_PORT);
   
  int cnt=0;
  sss_handle_accept(fd_listen, &conn);
  
  while(1)
  {
         sss_handle_receive(&conn);
        printf("cnt=%d\n\n",++cnt);
  } /* while(1) */
}