ESP8266连接阿里云物联网平台

首先我们需要下载下面的依赖库
https://github.com/legenddcr/aliyun-mqtt-arduino
https://github.com/rweather/arduinolibs

这个我已经打包放到lib文件夹里面去了，我们只需要解压放到arduino的lib库里去
默认在C盘的文档里面

然后我们修改PubSubClient库的连接参数。这里改成60

下面我们把测试代码烧进去

#include
#include <PubSubClient.h>
#include <ArduinoJson.h>

#include "aliyun_mqtt.h"

// GPIO 13, D7 on the Node MCU v3
#define SENSOR_PIN 13

#define WIFI_SSID "wifi名字"
#define WIFI_PASSWD "wifi密码"

#define PRODUCT_KEY "a1NRzHXlTTp"
#define DEVICE_NAME "Band"
#define DEVICE_SECRET "563221c763c3cbd474a4180afb775948"

#define ALINK_BODY_FORMAT "{\"id\":\"123\",\"version\":\"1.0\",\"method\":\"%s\",\"params\":%s}"
#define ALINK_TOPIC_PROP_POST "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/event/property/post"
#define ALINK_TOPIC_PROP_POSTRSP "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/event/property/post_reply"
#define ALINK_TOPIC_PROP_SET "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/service/property/set"
#define ALINK_METHOD_PROP_POST "thing.event.property.post"

unsigned long lastMs = 0;

WiFiClient espClient;
PubSubClient mqttClient(espClient);

void initWifi(const char *ssid, const char *password)
{
    WiFi.mode(WIFI_STA);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED)
    {
        Serial.println("WiFi does not connect, try again ...");
        delay(3000);
    }

    Serial.println("Wifi is connected.");
    Serial.println("IP address: ");
    Serial.println(WiFi.localIP());
}

void callback(char *topic, byte *payload, unsigned int length)
{
    Serial.print("Message arrived [");
    Serial.print(topic);
    Serial.print("] ");
    payload[length] = '\0';
    Serial.println((char *)payload);

    if (strstr(topic, ALINK_TOPIC_PROP_SET))
    {
        StaticJsonBuffer<100> jsonBuffer;
        JsonObject &root = jsonBuffer.parseObject(payload);
        if (!root.success())
        {
            Serial.println("parseObject() failed");
            return;
        }
    }
}

void mqttCheckConnect()
{
//    Serial.println(mqttClient);
    Serial.println(PRODUCT_KEY);
    Serial.println(DEVICE_NAME);
    Serial.println(DEVICE_SECRET);
    while (!connectAliyunMQTT(mqttClient, PRODUCT_KEY, DEVICE_NAME, DEVICE_SECRET,"cn-shanghai"))
    {
    }

    Serial.println("MQTT connect succeed!");
    // client.subscribe(ALINK_TOPIC_PROP_POSTRSP);
    mqttClient.subscribe(ALINK_TOPIC_PROP_SET);
    Serial.println("subscribe done");
}

void mqttIntervalPost()
{
    char param[32];
    char jsonBuf[128];

    sprintf(param, "{\"HeartRate\":%d}", digitalRead(13));
    sprintf(jsonBuf, ALINK_BODY_FORMAT, ALINK_METHOD_PROP_POST, param);
    Serial.println(jsonBuf);
    mqttClient.publish(ALINK_TOPIC_PROP_POST, jsonBuf);
}

void setup()
{

    pinMode(SENSOR_PIN, INPUT);
    /* initialize serial for debugging */
    Serial.begin(115200);

    Serial.println("Demo Start");

    initWifi(WIFI_SSID, WIFI_PASSWD);

    mqttClient.setCallback(callback);
}

// the loop function runs over and over again forever
void loop()
{
    if (millis() - lastMs >= 5000)
    {
        lastMs = millis();
        mqttCheckConnect();

        /* Post */
        mqttIntervalPost();
    }

    mqttClient.loop();

    unsigned int WAIT_MS = 60000;
    if (digitalRead(SENSOR_PIN) == HIGH)
    {
        Serial.println("Motion detected!");
    }
    else
    {
        Serial.println("Motion absent!");
    }
    delay(WAIT_MS); // ms
    Serial.println(millis() / WAIT_MS);
}

然后我们就可以正确使用了，我遇到下面这两个问题
1.sha256.h 文件找不到，这个需要自己去下载这个库，然后找到我们需要的部分放到arduino里面就可以了。
2.一直连接不上，这个修改一下PubSubClient库的连接参数也成功解决

最终代码

#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <ArduinoJson.h>
#include "aliyun_mqtt.h"

/*
* esp8266连接阿里云平台
* 作者: 小游
* 参考demo: https://github.com/legenddcr/aliyun-mqtt-arduino/blob/master/examples/uno/uno.ino
* 完成时间: 2020/10/17
*/

// wifi账号密码
#define WIFI_SSID "xiaoyou"
#define WIFI_PASSWD "1806040103"

// 阿里云设备的必要信息
#define PRODUCT_KEY "a1NRzHXlTTp"
#define DEVICE_NAME "Band"
#define DEVICE_SECRET "563221c763c3cbd474a4180afb775948"
// 下面这个密码需要通过sha256加密获得 加密网址http://iot-face.oss-cn-shanghai.aliyuncs.com/tools.htm 秘钥就是DEVICE_SECRET，
// 加密的明文是下面这个，自己记得去掉[] 如果是自己的自行替换[]里面的内容
//clientId[Band]deviceName[Band]productKey[a1NRzHXlTTp]timestamp[23668]
#define TIMESTAMP "23668" 
#define MQTT_PASSWORD "dcf3dc9d40317ade161a42934eefe2ec4e0e4a2398dcd44798ae0bf833738e8d"

// 阿里云自带的订阅链接，这里我们用不到
#define ALINK_TOPIC_PROP_POST "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/event/property/post"
//#define ALINK_TOPIC_PROP_POSTRSP "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/event/property/post_reply"
//#define ALINK_TOPIC_PROP_SET "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/service/property/set"

// wifi的连接和mqtt的连接端
WiFiClient espClient;
PubSubClient mqttClient(espClient);

// 初始化wifi连接
void initWifi(const char *ssid, const char *password)
{
    WiFi.mode(WIFI_STA);
    WiFi.begin(ssid, password);
    // 不断检测是否连接wifi是否成功
    while (WiFi.status() != WL_CONNECTED)
    {
        Serial.println("WiFi does not connect, try again ...");
        delay(3000);
    }
    // 打印出wifi的ip地址
    Serial.println("Wifi is connected.");
    Serial.println("IP address: ");
    Serial.println(WiFi.localIP());
}

// 检查mqtt的连接状态
void mqttCheckConnect()
{
    // 判断是否连接
    while (!mqttClient.connected())
    {
        // 如果连接失败就自动重连
        Serial.println(F("Connecting to Aliyun IoT ..."));
        // 设置更据我们获取到的密码进行连接
        if (connectAliyunMQTTWithPassword(mqttClient, MQTT_PASSWORD))
        {
            Serial.println("[MQTT Connected]");
        }
        else
        {
            // 如果连接失败就尝试5秒后重连
            Serial.print(F("[MQTT Connect FAILED] [rc = "));
            Serial.print(mqttClient.state());
            Serial.println(F(": retrying in 5 seconds]"));
            // Wait 5 seconds before retrying
            delay(5000);
        }
    }
}

// mqtt发送数据
void mqttSendData(String HeartRate,String SystolicPressure,String DiastolicPressure)
{
    // 设置参数
    String payload = "{";
    payload += "\"HeartRate\":";
    payload += HeartRate;
    payload += ",\"SystolicPressure\":";
    payload += SystolicPressure;
    payload += ",\"DiastolicPressure\":";
    payload += DiastolicPressure;
    payload += "}";
    
    // 设置我们需要发送的数据
    String jsonData = F("{\"id\":\"123\",\"version\":\"1.0\",\"method\":\"thing.event.property.post\",\"params\":");
    jsonData += payload;
    jsonData += F("}");

    //吧json字符串转换为数组数据
    char alinkData[256];
    jsonData.toCharArray(alinkData, 256);
    // mqtt发布数据
    mqttClient.publish(ALINK_TOPIC_PROP_POST, alinkData);
    Serial.println(alinkData);
}

// 程序初始化
void setup()
{
    // 设置波特率，连接wifi，以及设置mqtt的基本参数
    Serial.begin(9600);
    Serial.println("Demo Start");
    initWifi(WIFI_SSID, WIFI_PASSWD);
    mqttPrepare(TIMESTAMP, PRODUCT_KEY, DEVICE_NAME, DEVICE_SECRET);
}

// 程序循环
void loop()
{
    // 检查mqtt的连接状态
    mqttCheckConnect();
    // 这里相当于mqtt的心跳包
    mqttClient.loop();
    // 监听串口，判断串口是否有数发送过来
    if(Serial.available()){
      //开始读取数据
      // 注意 双引号引起来的都是字符串常量，单引号引起来的都是字符常量， 我们这里需要要用单引号
      String data = Serial.readStringUntil('e');
      String h =  data.substring(7,10);
      String l = data.substring(11,14);
      String heart = data.substring(15,18);
      // 打印读取到的数据
      Serial.print("getHardData：");
      Serial.println(data);
      // mqtt数据上报
      mqttSendData(heart,h,l);
    }
    delay(100);
}