Contributed by 黎明将至!, organized by Ai-Thinker

Ai-WB2-32S AT+SOCKET TCP Server Setup (Communication Between Two Modules)

Introduction

Hello everyone! This article introduces how to set up a TCP server on the Ai-WB2-32S using AT+SOCKET commands plus AP mode. You will need two Ai-WB2-32S modules: module 1 acts as the TCP server, and module 2 acts as the TCP client.

Method 1 (One Module Hosts a Hotspot, the Other Connects to It)

Prepare two WiFi-capable modules (one as the server, one as the client).

Step 1: Configure the Server

AT+WMODE=2 (Enable AP mode)

AT+WAP=SDT,12345678,1,3,0 (Configure AP mode parameters)

AT+SOCKET=3,8001 (Configure the server and set the port number)

Step 2: Configure the Client

AT+WMODE=1 (Enable STA mode)

AT+WJAP=SDT,12345678 (Connect to the WiFi broadcast by the server)

AT+WJAP? (Check the server's IP address)

AT+SOCKET=4,192.168.43.1,8001 (Connect to the server; a ConID will be returned)

AT+SOCKETSENDLINE=ConID,3,123 (Send data to the server via the ConID)

Step 3: Check the Server

When the client connects, a ConID is assigned. When the client sends data, you will see the following:

+EVENT:SocketDown,2,3 At this point, use AT+SOCKETREAD=2 (the 2 here is the ConID) to view the actual data;

AT+SOCKETSENDLINE=2,3,456 (Send data to the client)

Step 4: The Client Views the Data

AT+SOCKETREAD=1 (the 1 here is the ConID obtained when connecting to the server)

Method 2 (Both Modules Connect to the Same Hotspot)

Step 1: Create the TCP Server (Commands Run on Module 1)

AT+WMODE=1,1 (Set to STA mode)

AT+WJAP=WiFi account, WiFi password

AT+SOCKET=3,8001 (Create the TCP server and set the port number to 8001)

Step 2: Create the TCP Client (Commands Run on Module 2)

AT+MODE=1,1 (Set to STA mode)

AT+WJAP=WiFi account, WiFi password (connect to the same hotspot as the server)

AT+WJAP?（注意这里为模组一的AT指令，查询TCPServer的IP地址）

AT+SOCKET=4,Server IP address,Server port number (the server port is the one set earlier; after connecting to the TCP server, a ConID will be returned)

AT+SOCKETSENDLINE=ConID,3,123 (ConID obtained from the previous command; 3 is the maximum data length; 123 is the actual data)

Step 3: Read Data from the Client and Send Data to the Client

AT+SOCKETREAD=ConID（这里的指令在模组一里面执行，ConID is the ConID generated when the client connects, i.e., the ConID on the left side of the figure above）

AT+SOCKETSENDLINE=ConID,3,345（模组一执行，ConID is the ConID generated when the client establishes the connection, i.e., the ConID on the left side of the figure above; 3 is the maximum data length to send to the client; 345 is the actual data to send）

AT+SOCKETREAD=ConID（模组二执行，the ConID here is the one generated when the connection to the server was established; read the actual data sent by the server）

3. Notes

Original link: <https://blog.csdn.net/qq_54193285/article/details/135896373?spm=1001.2014.3001.5501>