.. _netx_duo_tcp_server:

Netx Duo Tcp服务端
==============================

概述
------

这个例程演示了netx的tcp服务端功能。

硬件设置
------------

用网线连接开发板和电脑/路由器/交换机

工程配置
------------

- 以太网端口配置：参考 `以太网通用工程设置 <../../../../lwip/doc/Ethernet_Common_Project_Settings_zh.rst>`_

- 可以通过`set(CONFIG_ECLIPSE_THREADX_NETXDUO_ADDONS_DHCP 1)`的语句来使能DHCP功能。

运行现象
------------

当工程正确运行后,程序会监听端口 **ECHO_SERVER_PORT** (7777)。一旦有一个客户端连接到了服务端，程序会等待客户端发送数据直到收到数据、10秒没收到数据或者客户端关闭了链接。如果收到了客户端的数据，程序会将同样的数据返回给客户端，随后关闭链接。物理链接状态会被周期性的打印到终端上,直到链接状态为 **Up** 。以下消息会被打印到终端上:

.. code-block:: console

   Reference Clock: Internal Clock
   Enet phy init passed !
   Link Status: Down
   NetXDuo is running

   IP address: 192.168.1.223

   Mask: 255.255.255.0

   Link Status: Up
   Link Speed:  100Mbps
   Link Duplex: Full duplex
   A client is connected to the server.
   Receive data from client.
   Send data back to client success.
   Close the connection
   A client is connected to the server.
   Receive data from client.
   Send data back to client success.
   Close the connection
   A client is connected to the server.
   Failed to receive from the socket, reason 1.
   Close the connection