232-ch579m learning and development Ethernet routine TCP server (project application package, LAN or WAN test)

explain

This section demonstrates that the development board acts as TCP Server and upper computer TCP Client LAN communication

Prepare a router or switch .

test

1. A router or switch connected by a network cable ( Connect to the same computer )

2. Compile and download the program in this section to the development board

3. The serial port on the development board will print the IP Address

4. Turn on the computer TCP Debugging assistant ( Install the following , Can test multiple channels TCP client )

5. Create connection

IP Fill in the address of the development board IP Address , This should be filled in according to the serial port printed above , My is 192.168.1.101

Development board TCP The port number that the server listens on is 6666

6. The development board will print the connected client information

TCP The debugging assistant will receive data from the development board at regular intervals

7. The computer debugging assistant sends data to the development board (TCP The server )

Development board (TCP The server ) Reply to whatever data you receive , At the same time, it will use the serial port to output the received information ,

8. Create another client to connect

The second client receives data from the server at regular intervals , Others will not be tested

Program description

1, The program is encapsulated , Let me explain how to use

2, To build a TCP Server variables

net_tcp_server_struct net_tcp_server;

3, hold net_tcp_server_data Function is put into the network event handler

4, Set the port number that the server listens to

5, Because it's a LAN , So in DHCP The callback function calls TCP Server creation function

The following callback function is written in this way , I will explain the processing procedure later ( The example I provided supports multiple connections , So there are a lot of programs )

6, After the client is connected, it will enter this

Because the actual project may need to send messages to the client elsewhere , So record this socket

It's written below if Judgment is to judge which variable is not used , Just use which variable to record

If there is only one client, you can

7, Receive messages from clients

You can also know the information of the client in the receiving ip Address and port number

    printf("ip address:%d,%d,%d,%d,%ld\r\n",
    SocketInf[socket_client_value->socket_id].IPAddr[0], 
    SocketInf[socket_client_value->socket_id].IPAddr[1], 
    SocketInf[socket_client_value->socket_id].IPAddr[2], 
    SocketInf[socket_client_value->socket_id].IPAddr[3],
    SocketInf[socket_client_value->socket_id].DesPort
    );

Copy

8, Send a message to the client

The direct return in the receive is written as follows

Sending data to the client elsewhere requires the previous variable

matters needing attention

1, In case of multiple client connections , actually  socket1,socket2,socket3,socket4 The record of variables may be variable .

Suppose there is 2 A client , 192.168.1.90  ;  192.168.1.101

In limine 192.168.1.90  Connect first   192.168.1.101 Back connection ,

Now? socket1 Recorded 192.168.1.90;  socket2 Recorded 192.168.101

But if two clients are disconnected and connected repeatedly from time to time , The record may change

Probably socket2 Record 192.168.90 ;  socket1 Record 192.168.1.101

I'll come back and write ...