esp8266上阿里云代码

以下是一个简单的ESP8266连接阿里云的示例代码：

#include <ESP8266WiFi.h>
#include <PubSubClient.h>

// WiFi网络信息
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// 阿里云服务器信息
const char* server = "your_IoT_Platform_endpoint";
const char* deviceName = "your_device_name";
const char* deviceSecret = "your_device_secret";
const char* productKey = "your_product_key";

// MQTT信息
const char* subTopic = "/sys/" + String(productKey) + "/" + String(deviceName) + "/thing/service/property/set";
const char* pubTopic = "/sys/" + String(productKey) + "/" + String(deviceName) + "/thing/event/property/post";
const char* mqttClientId = "clientId_" + String(productKey) + "_" + String(deviceName);
const char* mqttUsername = String(deviceName) + "&" + String(productKey);
const char* mqttPassword = "";

WiFiClient wifiClient;
PubSubClient mqttClient(wifiClient);

void setup() {
  Serial.begin(9600);

  // 连接WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi!");

  // 连接MQTT服务器
  mqttClient.setServer(server, 1883);
  mqttClient.setCallback(mqttCallback);
  while (!mqttClient.connected()) {
    String mqttClientIdStr = mqttClientId;
    String mqttUsernameStr = mqttUsername;
    String mqttPasswordStr = mqttPassword;
    Serial.println("Connecting to MQTT server...");
    if (mqttClient.connect(mqttClientIdStr.c_str(), mqttUsernameStr.c_str(), mqttPasswordStr.c_str())) {
      Serial.println("Connected to MQTT server!");
    } else {
      Serial.print("Failed to connect to MQTT server, rc=");
      Serial.println(mqttClient.state());
      delay(5000);
    }
  }

  // 订阅主题
  mqttClient.subscribe(subTopic);
}

void loop() {
  // 处理MQTT消息
  mqttClient.loop();

  // 发布消息
  StaticJsonDocument<256> jsonDoc;
  jsonDoc["id"] = millis();
  jsonDoc["version"] = "1.0";
  JsonObject data = jsonDoc.createNestedObject("params");
  data["temperature"] = 23.5;
  data["humidity"] = 65.8;
  char jsonStr[256];
  serializeJson(jsonDoc, jsonStr);
  mqttClient.publish(pubTopic, jsonStr);
}

void mqttCallback(char* topic, byte* payload, unsigned int length) {
  // 处理订阅的消息
  // ...
}

注意替换代码中的以下信息：

- `your_SSID`：WiFi网络名称。
- `your_PASSWORD`：WiFi网络密码。
- `your_IoT_Platform_endpoint`：阿里云IoT平台的服务器地址。
- `your_device_name`：设备的名称。
- `your_device_secret`：设备的密钥。
- `your_product_key`：产品的密钥。

此外，代码中还包含了一个`mqttCallback`函数，用于处理订阅的消息。您需要根据自己的需求来实现这个函数。