add esp32 mqtt

wifi-mqtt-esp32-PubSubClient-dht11/wifi-mqtt-esp32-PubSubClient-dht11/wifi-mqtt-esp32-PubSubClient-dht11.ino

@@ -0,0 +1,126 @@
+#include <WiFi.h>
+#include <PubSubClient.h>
+#include <DHT.h>
+
+#define DHT_PIN 15
+#define DHT_TYPE DHT11
+
+DHT dht(DHT_PIN, DHT_TYPE);
+
+// 配置信息
+const char* ssid = "rehome";
+const char* password = "Ruihong123";
+
+const char* mqtt_server = "47.242.184.139";
+const int mqtt_port = 1883;
+const char* mqtt_user = "admin"; // 如果需要认证
+const char* mqtt_password = "publish452131wW452131wW$";
+
+WiFiClient espClient;
+PubSubClient client(espClient);
+
+unsigned long lastSensorRead = 0;
+const long sensorInterval = 10000; // 10秒
+
+void setup_wifi() {
+  delay(10);
+  Serial.println();
+  Serial.print("正在连接: ");
+  Serial.println(ssid);
+
+  WiFi.begin(ssid, password);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+
+  Serial.println("");
+  Serial.println("WiFi 连接成功");
+  Serial.println("IP 地址: ");
+  Serial.println(WiFi.localIP());
+}
+
+void callback(char* topic, byte* payload, unsigned int length) {
+  Serial.print("收到消息 [");
+  Serial.print(topic);
+  Serial.print("]: ");
+  
+  for (int i = 0; i < length; i++) {
+    Serial.print((char)payload[i]);
+  }
+  Serial.println();
+}
+
+void reconnect() {
+  while (!client.connected()) {
+    Serial.print("尝试 MQTT 连接...");
+    
+    // 客户端 ID
+    String clientId = "ESP32Client-";
+    clientId += String(random(0xffff), HEX);
+    
+    // 尝试连接
+    if (client.connect(clientId.c_str(), mqtt_user, mqtt_password)) {
+      Serial.println("连接成功");
+      
+      // 订阅主题
+      client.subscribe("esp32/status");
+      
+    } else {
+      Serial.print("失败，错误代码: ");
+      Serial.print(client.state());
+      Serial.println(" 5秒后重试...");
+      delay(5000);
+    }
+  }
+}
+
+void readAndPublishSensorData() {
+  float temperature = dht.readTemperature();
+  float humidity = dht.readHumidity();
+  
+  if (!isnan(temperature) && !isnan(humidity)) {
+    char tempStr[8];
+    char humStr[8];
+    
+    dtostrf(temperature, 6, 2, tempStr);
+    dtostrf(humidity, 6, 2, humStr);
+    
+    client.publish("iot/sensor/temperature", tempStr);
+    client.publish("iot/sensor/humidity", humStr);
+    
+    Serial.printf("传感器数据已发布: 温度=%s°C, 湿度=%s%%\n", tempStr, humStr);
+
+    String sendStr = String(temperature)+" "+String(humidity);
+    client.publish("esp32/status", sendStr.c_str());
+    
+  }
+}
+
+void setup() {
+  Serial.begin(115200);
+  dht.begin();
+  
+  setup_wifi();
+  client.setServer(mqtt_server, 1883);
+  client.setCallback(callback);
+  
+  //pinMode(LED_BUILTIN, OUTPUT);
+}
+
+void loop() {
+  if(WiFi.status() != WL_CONNECTED){
+    setup_wifi();
+  }
+  if (!client.connected()) {
+    reconnect();
+  }
+  client.loop();
+  
+  // 定期读取传感器数据
+  if (millis() - lastSensorRead > sensorInterval) {
+    lastSensorRead = millis();
+    readAndPublishSensorData();
+  }
+}

wifi-mqtt-esp32-PubSubClient/wifi-mqtt-esp32-PubSubClient/wifi-mqtt-esp32-PubSubClient.ino

@@ -0,0 +1,98 @@
+#include <WiFi.h>
+#include <PubSubClient.h>
+
+// WiFi 配置
+const char* ssid = "rehome";
+const char* password = "Ruihong123";
+
+// MQTT 配置
+const char* mqtt_server = "47.242.184.139"; // 公共测试服务器
+const int mqtt_port = 1883;
+const char* mqtt_user = "admin"; // 如果需要认证
+const char* mqtt_password = "publish452131wW452131wW$";
+
+WiFiClient espClient;
+PubSubClient client(espClient);
+
+void setup_wifi() {
+  delay(10);
+  Serial.println();
+  Serial.print("正在连接: ");
+  Serial.println(ssid);
+
+  WiFi.begin(ssid, password);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+
+  Serial.println("");
+  Serial.println("WiFi 连接成功");
+  Serial.println("IP 地址: ");
+  Serial.println(WiFi.localIP());
+}
+
+void callback(char* topic, byte* payload, unsigned int length) {
+  Serial.print("收到消息 [");
+  Serial.print(topic);
+  Serial.print("]: ");
+  
+  for (int i = 0; i < length; i++) {
+    Serial.print((char)payload[i]);
+  }
+  Serial.println();
+}
+
+void reconnect() {
+  while (!client.connected()) {
+    Serial.print("尝试 MQTT 连接...");
+    
+    // 客户端 ID
+    String clientId = "ESP32Client-";
+    clientId += String(random(0xffff), HEX);
+    
+    // 尝试连接
+    if (client.connect(clientId.c_str(), mqtt_user, mqtt_password)) {
+      Serial.println("连接成功");
+      
+      // 订阅主题
+      client.subscribe("esp32/status");
+      
+    } else {
+      Serial.print("失败，错误代码: ");
+      Serial.print(client.state());
+      Serial.println(" 5秒后重试...");
+      delay(5000);
+    }
+  }
+}
+
+void setup() {
+  Serial.begin(115200);
+  setup_wifi();
+  
+  client.setServer(mqtt_server, mqtt_port);
+  client.setCallback(callback);
+}
+
+void loop() {
+  if(WiFi.status() != WL_CONNECTED){
+    setup_wifi();
+  }
+  if (!client.connected()) {
+    reconnect();
+  }
+  client.loop();
+
+  // 发布消息示例
+  static unsigned long lastMsg = 0;
+  if (millis() - lastMsg > 5000) {
+    lastMsg = millis();
+    
+    String message = "Hello from ESP32 - " + String(millis());
+    client.publish("esp32/status", message.c_str());
+    
+    Serial.println("消息已发布: " + message);
+  }
+}