[C]NodeMCU(ESP8266)接入阿里云物联网平台

#include <ESP8266WiFi.h>

/* 依赖 PubSubClient 2.4.0 */

#include <PubSubClient.h>

/* 依赖 ArduinoJson 5.13.4 */

#include <ArduinoJson.h>



#define SENSOR_PIN    13



/* 连接您的WIFI SSID和密码 */

#define WIFI_SSID         "路由器SSID"

#define WIFI_PASSWD       "密码"





/* 设备的三元组信息*/

#define PRODUCT_KEY       "设备PRODUCT_KEY"

#define DEVICE_NAME       "替换DEVICE_NAME"

#define DEVICE_SECRET     "替换DEVICE_SECRET"

#define REGION_ID         "cn-shanghai"



/* 线上环境域名和端口号，不需要改 */

#define MQTT_SERVER       PRODUCT_KEY ".iot-as-mqtt." REGION_ID ".aliyuncs.com"

#define MQTT_PORT         1883

#define MQTT_USRNAME      DEVICE_NAME "&" PRODUCT_KEY



#define CLIENT_ID         "esp8266|securemode=3,timestamp=1234567890,signmethod=hmacsha1|"

// 算法工具: http://iot-face.oss-cn-shanghai.aliyuncs.com/tools.htm 进行加密生成password

// password教程 https://www.yuque.com/cloud-dev/iot-tech/mebm5g

#define MQTT_PASSWD       "参考上面password教程，算法工具生成"



#define ALINK_BODY_FORMAT         "{\"id\":\"123\",\"version\":\"1.0\",\"method\":\"thing.event.property.post\",\"params\":%s}"

#define ALINK_TOPIC_PROP_POST     "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/event/property/post"



unsigned long lastMs = 0;

WiFiClient espClient;

PubSubClient  client(espClient);





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);



}





void wifiInit()

{

    WiFi.mode(WIFI_STA);

    WiFi.begin(WIFI_SSID, WIFI_PASSWD);

    while (WiFi.status() != WL_CONNECTED)

    {

        delay(1000);

        Serial.println("WiFi not Connect");

    }



    Serial.println("Connected to AP");

    Serial.println("IP address: ");

    Serial.println(WiFi.localIP());



    

Serial.print("espClient [");





    client.setServer(MQTT_SERVER, MQTT_PORT);   /* 连接WiFi之后，连接MQTT服务器 */

    client.setCallback(callback);

}





void mqttCheckConnect()

{

    while (!client.connected())

    {

        Serial.println("Connecting to MQTT Server ...");

        if (client.connect(CLIENT_ID, MQTT_USRNAME, MQTT_PASSWD))



        {



            Serial.println("MQTT Connected!");



        }

        else

        {

            Serial.print("MQTT Connect err:");

            Serial.println(client.state());

            delay(5000);

        }

    }

}





void mqttIntervalPost()

{

    char param[32];

    char jsonBuf[128];



    sprintf(param, "{\"idle\":%d}", digitalRead(13));

    sprintf(jsonBuf, ALINK_BODY_FORMAT, param);

    Serial.println(jsonBuf);

    boolean d = client.publish(ALINK_TOPIC_PROP_POST, jsonBuf);

    Serial.print("publish:0 失败;1成功");

    Serial.println(d);

}





void setup() 

{



    pinMode(SENSOR_PIN,  INPUT);

    /* initialize serial for debugging */

    Serial.begin(115200);

    Serial.println("Demo Start");



    wifiInit();

}





// the loop function runs over and over again forever

void loop()

{

    if (millis() - lastMs >= 5000)

    {

        lastMs = millis();

        mqttCheckConnect(); 



        /* 上报 */

        mqttIntervalPost();

    }



    client.loop();

    if (digitalRead(SENSOR_PIN) == HIGH){

    Serial.println("Motion detected!");

    delay(2000);

      }

    else {

    Serial.println("Motion absent!");

    delay(2000);

  }



}