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ESP32开发-两个WIFI设备的通讯搭建

java 2025/8/22 4:11:14

1. AP端代码（热点创建者）

#include <WiFi.h>
#include <WiFiClient.h>
#include <WiFiAP.h>const char* ap_ssid = "ESP32_AP";
const char* ap_password = "12345678";WiFiServer server(80); // 创建TCP服务器，端口80void setup() {Serial.begin(115200);delay(100);// 启动AP模式WiFi.softAP(ap_ssid, ap_password);Serial.println();Serial.print("AP IP地址: ");Serial.println(WiFi.softAPIP()); // 打印AP的IP地址server.begin(); // 启动服务器
}void loop() {WiFiClient client = server.available(); // 监听客户端连接if (client) {Serial.println("新客户端连接");while (client.connected()) {if (client.available()) {String message = client.readStringUntil('\n'); // 读取客户端消息Serial.print("收到消息: ");Serial.println(message);// 回复客户端client.print("AP已收到: " + message + "\n");}}client.stop();Serial.println("客户端断开");}
}

2. STA端代码（连接设备）

#include <WiFi.h>const char* ssid = "ESP32_AP";
const char* password = "12345678";WiFiClient client;
const char* host = "192.168.4.1"; // AP的默认IP
const int port = 80;void setup() {Serial.begin(115200);delay(100);// 连接到APWiFi.begin(ssid, password);Serial.print("正在连接到AP");while (WiFi.status() != WL_CONNECTED) {delay(500);Serial.print(".");}Serial.println();Serial.print("已连接，STA IP: ");Serial.println(WiFi.localIP());
}void loop() {Serial.println("尝试连接服务器...");if (!client.connect(host, port)) {Serial.println("连接失败");delay(1000);return;}// 发送消息到APString message = "Hello from STA " + String(millis());client.print(message + "\n");Serial.println("发送: " + message);// 等待回复unsigned long timeout = millis();while (client.connected() && millis() - timeout < 3000) {if (client.available()) {String line = client.readStringUntil('\n');Serial.print("收到回复: ");Serial.println(line);break;}}client.stop();delay(2000); // 每2秒通信一次
}