Receiving UDP Data (standard interface)
Part of the FreeRTOS+TCP Networking Tutorial

static void vUDPReceivingUsingStandardInterface( void *pvParameters )
{
long lBytes;
uint8_t cReceivedString[ 60 ];
struct freertos_sockaddr xClient, xBindAddress;
uint32_t xClientLength = sizeof( xClient );
Socket_t xListeningSocket;

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

   /* Check the socket was created. */
   configASSERT( xListeningSocket != FREERTOS_INVALID_SOCKET );

   /* Bind to port 10000. */
   xBindAddress.sin_port = FreeRTOS_htons( 10000 );
   FreeRTOS_bind( xListeningSocket, &xBindAddress, sizeof( xBindAddress ) );

   for( ;; )
   {
       /* Receive data from the socket.  ulFlags is zero, so the standard
       interface is used.  By default the block time is portMAX_DELAY, but it
       can be changed using FreeRTOS_setsockopt(). */
       lBytes = FreeRTOS_recvfrom( xListeningSocket,
                                   cReceivedString,
                                   sizeof( cReceivedString ),
                                   0,
                                   &xClient,
                                   &xClientLength );

       if( lBytes > 0 )
       {
           /* Data was received and can be process here. */
       }
   }
}