CC3200-LAUNCHXL: TCP IP Socket issue

My requirement is to make WiFi to UART bridge. I have used TCP IP socket sdk code and modified it with FreeRTOS in two different task as show below:

//part of code added in the main

osi_TaskCreate( UART_to_WiFi, "WiFi_Tx",\
OSI_STACK_SIZE, NULL, 3, NULL );

/* Task creation for Data from WiFi to UART */
osi_TaskCreate( WiFi_to_UART, "WiFi_Rx",\
OSI_STACK_SIZE, NULL, 2, NULL );

/* Start the scheduler */
osi_start();

//UART_to_WiFi code 

static void UART_to_WiFi(void *pvParameters)
{
    /* local variables */
    char tx_buffer[1024];
    int index = 0;
    char chr;

while(1)
{
     /* clearing data */
     memset(tx_buffer,'\0',sizeof(tx_buffer));

     /* Read data from UART */
     for(;;)
      {
          chr = UartGetChar();
          if(chr == '\n')
          {
             tx_buffer[index] = chr;
             index = 0;
             break;
            }
            else
             {
                tx_buffer[index] = chr;
                index++;
             }
       }

         if(strlen(tx_buffer) > 0)
         {
            /* Sending data over WiFi */
            int err = sl_Send(sock, tx_buffer, strlen(tx_buffer), 0);

           if( err < 0 )
            {
               UART_PRINT("Error occurred during sending data \n\r");
             }
        }

  /* Task delay */
  osi_Sleep(12);
   }
}

//WiFi_to_UART code

static void WiFi_to_UART(void *pvParameters)
{
    /* local variables */
    char rx_buffer[1024];
    int index = 0;

    while(1)
    {
         /* clearing data */
         memset(rx_buffer,'\0',sizeof(rx_buffer));

         /* Receiving data over wifi */
         int err = sl_Recv(sock, rx_buffer, sizeof(rx_buffer), 0);

        if(err > 0)
        {
            /* Write data to the UART */
            while(index < strlen(rx_buffer))
             {
                 UartPutChar(rx_buffer[index]);
                 index++;
              }
             index = 0;
        }

      /* Task delay */
      osi_Sleep(15);
   }
}

The issue is that data its getting transmitted over WiFi but for the first time recv() function is not working. Due to this, the data is mismatching i.e. 2 Tx data is the 1Rx data and 3rd Tx data is the 2 Rx data and so on.

Addditionally, the socket function is as show below:

void socket_connect()
{
   /* Socket variables */
    int iStatus;
    SlSockAddrIn_t sAddr;
     int iAddrSize;

     /* Assign values to variables */
    sAddr.sin_family = SL_AF_INET;
    sAddr.sin_port = sl_Htons((unsigned short)g_uiPortNum);
    sAddr.sin_addr.s_addr = sl_Htonl((unsigned int)g_ulDestinationIp);
    iAddrSize = sizeof(SlSockAddrIn_t);

    while(1)
     {
          /* Socket creation */
          sock = sl_Socket(SL_AF_INET,SL_SOCK_STREAM, 0);
          if( sock < 0 )
          {
                UART_PRINT("Socket is not created \r\n");
           }
            else
           {
              UART_PRINT("Socket has been created \r\n");
            }

            /* Socket connection */
             iStatus = sl_Connect(sock, ( SlSockAddr_t *)&sAddr, iAddrSize);
             if( iStatus < 0 )
             {
                 UART_PRINT("Socket disconnected ... \r\n");
             }
             else
              {
                UART_PRINT("Socket has successfully connected \r\n");

                /* Show Green LED when socket is created successfully */
                GPIO_IF_LedOn(MCU_GREEN_LED_GPIO);

                break;
               }
         }
}

To the above, I have tried Non-blocking method, the client is getting connected to WiFi and socket but when during send function I am getting error code as -1

Can you please tell where the issue is going on?

Thanks,

Devaharsha