创建、配置和绑定 UDP 套接字
FreeRTOS-Plus-TCP 联网教程节选

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, 

                                          /* Use FREERTOS_AF_INET6 for IPv6 UDP socket */

                                       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.

        */

   }

}



Creating, configuring and binding a UDP socket