我的物联项目环境搭建（2）Esp8266设备端代码（测试版）

﹏ヽ暗。殇╰゛Y 2022-05-09 13:00 203阅读 0赞

**步骤一、Arduino1.8.5**

#include <ESP8266WiFi.h>
    #include <PubSubClient.h>
    
    // Update these with values suitable for your network.
    
    const char* ssid = "xxxxx";
    const char* password = "xxx";
    //const char* mqtt_server = "axxxxxx.xxx.com";
    const char* mqtt_server = "192.168.1.187";
    //const char* mqtt_server = "xxx.xxx.xx.xxx";
    byte mac[6];  // the MAC address of your Wifi shield
    
    WiFiClient espClient;
    PubSubClient client(espClient);
    long lastMsg = 0;
    char msg[50];
    int value = 0;
    
    void setup() {
      pinMode(BUILTIN_LED, OUTPUT);     // Initialize the BUILTIN_LED pin as an output
      Serial.begin(115200);
      setup_wifi();
      client.setServer(mqtt_server, 1883);
      client.setCallback(callback);
    }
    
    void setup_wifi() {
    
      delay(10);
      // We start by connecting to a WiFi network
      Serial.println();
      Serial.print("Connecting to ");
      Serial.println(ssid);
    
      WiFi.begin(ssid, password);
    
      while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
      }
    
      Serial.println("");
      Serial.println("WiFi connected");
      Serial.println("IP address: ");
      Serial.println(WiFi.localIP());
       WiFi.macAddress(mac);
      Serial.print("MAC: ");
      Serial.print(mac[5],HEX);
      Serial.print(":");
      Serial.print(mac[4],HEX);
      Serial.print(":");
      Serial.print(mac[3],HEX);
      Serial.print(":");
      Serial.print(mac[2],HEX);
      Serial.print(":");
      Serial.print(mac[1],HEX);
      Serial.print(":");
      Serial.println(mac[0],HEX);
    }
    
    void callback(char* topic, byte* payload, unsigned int length) {
      Serial.print("Message arrived [");
      Serial.print(topic);
      Serial.print("] ");
      for (int i = 0; i < length; i++) {
        Serial.print((char)payload[i]);
      }
      Serial.println();
    
      // Switch on the LED if an 1 was received as first character
      if ((char)payload[0] == '1') {
        digitalWrite(BUILTIN_LED, LOW);   // Turn the LED on (Note that LOW is the voltage level
        // but actually the LED is on; this is because
        // it is acive low on the ESP-01)
      } else {
        digitalWrite(BUILTIN_LED, HIGH);  // Turn the LED off by making the voltage HIGH
      }
    
    }
    
    void reconnect() {
      // Loop until we're reconnected
      while (!client.connected()) {
        Serial.print("Attempting MQTT connection...");
        // Attempt to connect
        if (client.connect("ESP8266Client")) {
          Serial.println("connected");
          // Once connected, publish an announcement...
          client.publish("outTopic", "hello world");
          // ... and resubscribe
          client.subscribe("inTopic");
        } else {
          Serial.print("failed, rc=");
          Serial.print(client.state());
          Serial.println(" try again in 5 seconds");
          // Wait 5 seconds before retrying
          delay(5000);
        }
      }
    }
    void loop() {
    
      if (!client.connected()) {
        reconnect();
      }
      client.loop();
    
      long now = millis();
      if (now - lastMsg > 2000) {
        lastMsg = now;
        ++value;
        snprintf (msg, 75, "hello world #%ld", value);
        Serial.print("Publish message: ");
        Serial.println(msg);
        
        client.publish("outTopic", msg);
    
       // client.publish("outTopic", msg);
      }
    }

**步骤二、开发调试版：Esp8266**  
**步骤三、mqtt协议实现状态上传及数据下发**