ESP8266/ESP32构建MQTT协议连接进入EMQX服务器进行服务器指令通讯（客户端控制灯）

一、配置Arduino IDE以及esp8266/esp32环境

Arduino IDE 2.0安装，ESP8266/ESP32环境配置（Win11）_JASON丶LI的博客-CSDN博客https://blog.csdn.net/weixin_61908666/article/details/127828616?spm=1001.2014.3001.5501

二、搭建emqx环境

win11搭建EMQX环境_JASON丶LI的博客-CSDN博客https://blog.csdn.net/weixin_61908666/article/details/127944288?spm=1001.2014.3001.5502

三、点灯测试

输入下列代码上传到开发板（作者用的是ESP8266）

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_BUILTIN, LOW);

  delay(1000);                      
  digitalWrite(LED_BUILTIN, HIGH);  
  delay(2000);                      
}

看到ESP8266上蓝色的呼吸灯一闪一闪就成功啦！！！

四、代码实现将ESP8266接入服务器并订阅对应信息

const char *ssid = "Jason";  // 输入你的WiFi名称
const char *password = "88888888";  // 输入你的WiFi密码
const char *mqtt_broker = "10.12.3.89";  //输入你的无线局域网适配器IPv4地址
const int mqtt_port = 1883;  //默认为1883

 Win+R打开运行框-->输入cmd-->输入ipconfig-->查找IPv4地址

 ESP8266接入服务器

创建WebSocket客户端

 下发指令

 查看ESP8266接收指令情况

 

源代码：

#include <ESP8266WiFi.h>  //esp8266
#include <PubSubClient.h>
//#include <WiFi.h>  // esp32  

const char *ssid = "Jason";  // 输入你的WiFi名称
const char *password = "88888888";  // 输入你的WiFi密码
const char *mqtt_broker = "10.12.3.89";  //输入你的无线局域网适配器IPv4地址
const int mqtt_port = 1883;  //默认为1883

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(115200); // 频段
  WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.println("Connecting to WiFi..");
    }
    Serial.println("Connected to the WiFi network");
    client.setServer(mqtt_broker, mqtt_port);
    client.setCallback(callback);
        while (!client.connected()) {
        Serial.println("Connecting to public emqx mqtt broker.....");
        if (client.connect("esp8266-client")) {
            Serial.println("Public emqx mqtt broker connected");
        } else {
            Serial.print("failed with state ");
            Serial.print(client.state());
            delay(2000);
        }
    }
    // publish and subscribe
    client.publish("esp8266/test", "hello emqx");
    client.subscribe("Android");
}

void callback(char *topic, byte *payload, unsigned int length) {
  
    Serial.print("Message arrived in topic: ");
    Serial.println(topic);
    Serial.print("Message:");
    String message;
    for (int i = 0; i < length; i++) {
        message = message + (char) payload[i];  // convert *byte to string
    }
    Serial.print(message);
    if (message == "lon") {
            digitalWrite(LED_BUILTIN, LOW);// LED on
      Serial.print(" on ready");
    }
      
    if (message == "loff"){ 
      digitalWrite(LED_BUILTIN, HIGH);// LED off
      Serial.print(" on ready");
      } 
    
    Serial.println();
    Serial.println("-----------------------");
}

void loop() {
  // digitalWrite(LED_BUILTIN, LOW);

  // delay(1000);                      
  // digitalWrite(LED_BUILTIN, HIGH);  
  // delay(2000);
  client.loop();                      
}

本文为作者独立编写

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