Create, Configure and Bind a UDP Socket
Part of the FreeRTOS+TCP Networking Tutorial

static void prvSimpleUDPServerTask( void *pvParameters )
{
long lBytes;
struct freertos_sockaddr xBindAddress;
Socket_t xListeningSocket;
const TickType_t xSendTimeOut = 200 / portTICK_PERIOD_MS;

   /* Attempt to open the UDP socket. */
   xListeningSocket = FreeRTOS_socket( FREERTOS_AF_INET,
                                       FREERTOS_SOCK_DGRAM,/*FREERTOS_SOCK_DGRAM for UDP.*/
                                       FREERTOS_IPPROTO_UDP );

   /* Check for errors. */
   configASSERT( xListeningSocket != FREERTOS_INVALID_SOCKET );

   /* Ensure calls to FreeRTOS_sendto() timeout if a network buffer cannot be
   obtained within 200ms. */
   FreeRTOS_setsockopt( xListeningSocket,
                        0,
                        FREERTOS_SO_SNDTIMEO,
                        &xSendTimeOut,
                        sizeof( xSendTimeOut ) );

   /* Bind the socket to port 0x1234. */
   xBindAddress.sin_port = FreeRTOS_htons( 0x1234 );
   FreeRTOS_bind( xListeningSocket, &xBindAddress, sizeof( xBindAddress ) );

   for( ;; )
   {
       /*
        * The socket can now send and receive data here.
        */
   }
}