Arduino ESP8266 上传湿温度数据到 OneNet 并控制舵机（无 OneNet 库）

以下是一个基于 Arduino 和 ESP8266 的代码示例，用于上传湿温度数据到 OneNet，并获取命令以控制舵机的开关。

#include <SoftwareSerial.h>

// 定义串口
SoftwareSerial esp8266(2, 3); // RX, TX

// 定义 WiFi 信息
const char* ssid = 'your_SSID';
const char* password = 'your_PASSWORD';

// 定义 OneNet 的设备 ID 和 API Key
const char* DeviceID = 'your_DEVICE_ID';
const char* APIKey = 'your_API_KEY';

// 定义舵机控制引脚
const int servoPin = 9;

void setup() {
  // 初始化串口和舵机引脚
  Serial.begin(9600);
  pinMode(servoPin, OUTPUT);

  // 初始化 ESP8266 串口
  esp8266.begin(9600);
  delay(1000);

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

void loop() {
  // 读取湿温度数据
  float humidity = 50.0;
  float temperature = 25.0;

  // 组装上传数据的 JSON 字符串
  String data = '{\"humidity\":' + String(humidity) + ',\"temperature\":' + String(temperature) + '}';

  // 发送 HTTP 请求上传数据到 OneNet
  String cmd = 'AT+CIPSTART="TCP","api.heclouds.com",80\r\n';
  esp8266.print(cmd);
  delay(1000);
  if (esp8266.find('OK')) {
    Serial.println('TCP connection established');
  }
  cmd = 'POST /devices/' + String(DeviceID) + '/datapoints HTTP/1.1\r\n';
  cmd += 'Host: api.heclouds.com\r\n';
  cmd += 'Content-Type: application/json\r\n';
  cmd += 'Content-Length: ' + String(data.length()) + '\r\n';
  cmd += 'api-key: ' + String(APIKey) + '\r\n';
  cmd += 'Connection: close\r\n';
  cmd += '\r\n';
  cmd += data;
  cmd += '\r\n';
  esp8266.print('AT+CIPSEND=');
  esp8266.println(cmd.length());
  delay(1000);
  if (esp8266.find('>')) {
    Serial.print('Sending data to OneNet: ');
    Serial.println(data);
    esp8266.print(cmd);
    delay(1000);
    if (esp8266.find('OK')) {
      Serial.println('Data sent to OneNet');
    } else {
      Serial.println('Error sending data');
    }
  } else {
    Serial.println('Error sending command');
  }

  // 获取命令并控制舵机
  cmd = 'AT+CIPSTART="TCP","api.heclouds.com",80\r\n';
  esp8266.print(cmd);
  delay(1000);
  if (esp8266.find('OK')) {
    Serial.println('TCP connection established');
  }
  cmd = 'GET /devices/' + String(DeviceID) + '/cmds?limit=1 HTTP/1.1\r\n';
  cmd += 'Host: api.heclouds.com\r\n';
  cmd += 'api-key: ' + String(APIKey) + '\r\n';
  cmd += 'Connection: close\r\n';
  cmd += '\r\n';
  esp8266.print('AT+CIPSEND=');
  esp8266.println(cmd.length());
  delay(1000);
  if (esp8266.find('>')) {
    Serial.println('Getting command from OneNet');
    esp8266.print(cmd);
    delay(1000);
    if (esp8266.find('OK')) {
      String response = '';
      while (esp8266.available()) {
        char c = esp8266.read();
        response += c;
      }
      Serial.print('OneNet response: ');
      Serial.println(response);

      // 解析命令并控制舵机
      int command = -1;
      int index = response.indexOf('value');
      if (index != -1) {
        index = response.indexOf(':', index);
        if (index != -1) {
          int end = response.indexOf(',', index);
          if (end == -1) {
            end = response.indexOf('}', index);
          }
          if (end != -1) {
            command = response.substring(index + 1, end).toInt();
          }
        }
      }
      if (command != -1) {
        Serial.print('Command received: ');
        Serial.println(command);
        if (command == 1) {
          digitalWrite(servoPin, HIGH);
        } else if (command == 0) {
          digitalWrite(servoPin, LOW);
        }
      }
    } else {
      Serial.println('Error getting command');
    }
  } else {
    Serial.println('Error sending command');
  }

  // 断开 TCP 连接
  cmd = 'AT+CIPCLOSE\r\n';
  esp8266.print(cmd);
  delay(1000);
}