ESP8266 连接阿里云物联网平台

项目代码

  1 #include <ESP8266WiFi.h>
  2 #include <PubSubClient.h>
  3 #include "DHT.h"
  4 
  5 
  6 /* 配置WIFI 
  7 */ 
  8 #define WIFI_SSID "*****"     //WIFI名称
  9 #define WIFI_PASSWD "*****"   //WIFI 密码
 10 
 11 // GPIO 5 D1
 12 #define LED 5
 13 
 14 WiFiClient espClient;
 15 PubSubClient client(espClient);
 16 // MQTT Broker
 17 
 18 /* 设备证书信息*/
 19 #define PRODUCT_KEY       "*****"
 20 #define DEVICE_NAME       "*****"
 21 #define DEVICE_SECRET     "*****"
 22 #define REGION_ID         "cn-shanghai"
 23 
 24 //
 25 #define ALINK_TOPIC_PROP_POST     "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/event/property/post"
 26 /* 线上环境域名和端口号，不需要改 */
 27 #define MQTT_SERVER       "*****"
 28 #define MQTT_PORT         1883
 29 #define MQTT_USRNAME      DEVICE_NAME "&" PRODUCT_KEY
 30 
 31 #define CLIENT_ID         PRODUCT_KEY "." DEVICE_NAME "*****"
 32 #define MQTT_PASSWD       "*****"
 33 #define ALINK_BODY_FORMAT  "{\"id\":\"123\",\"version\":\"1.0\",\"method\":\"thing.event.property.post\",\"params\":{\"CurrentHumidity\":%f,\"CurrentTemperature\":%f}}"
 34 
 35 unsigned long lastMs = 0;
 36  
 37 #define DHTPIN  2      //与ESP8266的D4相连
 38 #define DHTTYPE DHT11   // DHT 11
 39 
 40 DHT dht(DHTPIN, DHTTYPE);
 41 
 42 
 43 /*****************************************************
 44  * 函数名称：connectMQTT()
 45  * 函数说明：连接MQTT
 46  * 参数说明：无
 47 ******************************************************/
 48 void connectMQTT(){
 49        client.setServer(MQTT_SERVER, MQTT_PORT);
 50        client.setCallback(callback);
 51        while (!client.connected()) {  
 52         Serial.println("Connecting to public emqx mqtt broker.....");
 53         if (client.connect(CLIENT_ID,MQTT_USRNAME,MQTT_PASSWD)) {
 54             Serial.println("Public emqx mqtt broker connected");
 55         } else {
 56             Serial.print("failed with state ");
 57             Serial.println(client.state());
 58             delay(2000);
 59         }
 60     } 
 61     client.subscribe(ALINK_TOPIC_PROP_POST);
 62   }
 63 
 64 
 65 void callback(char *topic, byte *payload, unsigned int length) {
 66     Serial.print("Message arrived in topic: ");
 67     Serial.println(topic);
 68     Serial.print("Message:");
 69     String message;
 70     for (int i = 0; i < length; i++) {
 71         message = message + (char) payload[i];  // convert *byte to string
 72     }
 73     Serial.print(message);
 74     if (message == "on") {  // LED on
 75       digitalWrite(LED, LOW);
 76       digitalWrite(LED_BUILTIN, LOW); 
 77       }  
 78     if (message == "off") {// LED off
 79       digitalWrite(LED, HIGH); 
 80       digitalWrite(LED_BUILTIN, HIGH);
 81       } 
 82     Serial.println();
 83     Serial.println("-----------------------");
 84 } 
 85 
 86 void setup(void) {
 87     Serial.begin(115200);
 88     dht.begin();
 89   
 90     WiFi.mode(WIFI_STA);
 91      WiFi.begin(WIFI_SSID, WIFI_PASSWD);
 92     Serial.print("AutoConfig Waiting......");
 93      while (WiFi.status() != WL_CONNECTED)
 94       {
 95           delay(1000);
 96           Serial.println("WiFi not Connect");
 97     }  
 98     Serial.println("Connected to AP");
 99     Serial.println("IP address: ");
100     Serial.println(WiFi.localIP());
101     connectMQTT();  
102 }
103 
104 void loop(void) {
105  
106   client.loop(); 
107   // 读取温度或湿度大约需要250毫秒！
108   // 传感器读数也可能长达2秒“旧”（这是一个非常慢的传感器） 
109   float h = dht.readHumidity();
110   // 读取温度为摄氏温度（默认值）
111   float t = dht.readTemperature();
112   // 将温度读取为华氏度（isFahrenheit = true）
113   float f = dht.readTemperature(true);
114   Serial.printf("Humidity: %f %\n",h);//湿度
115   Serial.printf("Temperature: %f℃, %f℉ \n", t, f);//温度 
116 
117    if (millis() - lastMs >= 5000)
118     { 
119       lastMs = millis();
120         
121       char msg[200];
122       snprintf (msg, 200, ALINK_BODY_FORMAT, h,t);
123       client.publish(ALINK_TOPIC_PROP_POST,msg);
124     }
125 
126     delay(2000);
127 }

View Code

如果连接失败请修改（MQTT Connect err:-1）

路径：X:\Arduino\libraries\PubSubClient\src\PubSubClient.h

// MQTT_MAX_PACKET_SIZE : Maximum packet size
#ifndef MQTT_MAX_PACKET_SIZE
#define MQTT_MAX_PACKET_SIZE 1024 //由原来的128改为1024
#endif

// MQTT_KEEPALIVE : keepAlive interval in Seconds
#ifndef MQTT_KEEPALIVE
#define MQTT_KEEPALIVE 60 //由原来的15改为60
#endif

posted on 2024-05-30 13:32 freexiaoyu 阅读(75) 评论(0) 编辑收藏举报