udp_send( target, 1234, 4321, udp_send_buf, strlen( udp_send_buf ) );
            /*        |       |     |     |             |        */
            /*        |       |     |     |             Length   */
            /*        |       |     |     Buffer                 */
            /*        |       |     To port                      */
            /*        |       From port                          */
            /*        To, 0 for broadcast                        */