Wokwi - Online ESP32, STM32, Arduino Simulator

#include <WiFi.h>
#include "PubSubClient.h"

const char * MQTTServer = "broker.emqx.io";//
const char * MQTT_Topic = "sunny";//

// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "b35c1a01-7845-4e43-8678-4ee51bf43fa9";
int Port = 1883;//

WiFiClient espClient;
PubSubClient client(espClient);

const int mang[] = {2,4,5,19};
String stMessage;
void WIFIConnect() {
  Serial.println("Connecting to SSID: Wokwi-GUEST");
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("WiFi connected");
  Serial.print(", IP address: ");
  Serial.println(WiFi.localIP());
}

void MQTT_Reconnect() {
  while (!client.connected()) {
    if (client.connect(MQTT_ID)) {
      Serial.print("MQTT Topic: ");
      Serial.print(MQTT_Topic);
      Serial.print(" connected");
      client.subscribe(MQTT_Topic);
      Serial.println("");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.println(topic);
  Serial.print("Message: ");
  stMessage ="";

  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }
  Serial.println();
 
}

void setup() {
  Serial.begin(115200);

  WIFIConnect();
  client.setServer(MQTTServer, Port);
  client.setCallback(callback);
  for(int i = 0; i< 4; i++){
      pinMode(mang[i],OUTPUT);
  }
}

void loop() {
  delay(10);
  if (!client.connected()) {
    MQTT_Reconnect();
  }
  if (stMessage == "on") {
    for(int i = 0; i < 4; i++){
      digitalWrite(mang[i], HIGH);
      
      }delay(1000);
    for(int i = 0; i < 4; i++){
      digitalWrite(mang[i], LOW);
      
    }delay(1000);
      
  }
  else if (stMessage == "off") {
       for(int i = 0; i < 4; i++){
      digitalWrite(mang[i], LOW);
    }
        delay(500);
  }
  client.loop();
}


// <!DOCTYPE html>
// <html lang="en">
// <head>
//     <meta charset="UTF-8">
//     <meta http-equiv="X-UA-Compatible" content="IE=edge">
//     <meta name="viewport" content="width=device-width, initial-scale=1.0">
//     <script src="https://cdnjs.cloudflare.com/ajax/libs/paho-mqtt/1.0.1/mqttws31.min.js" type="text/javascript"></script>
//     <script src="https://code.jquery.com/jquery-3.6.1.min.js" type="text/javascript"></script>
// </head>
// <body>
//     <button class="bat">Bật LED</button>
//     <button class="tat">Tắt LED</button>
// </body>
// </html>

// <script>
//     $('.bat').click(function(){
//         message = new Paho.MQTT.Message("on");
//         message.destinationName = "vlute/den1";
//         client.send(message);
//     });

//     $('.tat').click(function(){
//         message = new Paho.MQTT.Message("off");
//         message.destinationName = "vlute/den1";
//         client.send(message);
//     });

//     client = new Paho.MQTT.Client("broker.emqx.io", 8083, "");

//     client.onConnectionLost = onConnectionLost;
//     client.onMessageArrived = onMessageArrived;

//     client.connect({onSuccess:onConnect});

//     function onConnect() {
//     console.log("onConnect");
//     // client.subscribe("World");
//     }

//     function onConnectionLost(responseObject) {
//     if (responseObject.errorCode !== 0) {
//         console.log("onConnectionLost:"+responseObject.errorMessage);
//     }
//     }

//     function onMessageArrived(message) {
//     console.log("onMessageArrived:"+message.payloadString);
//     }
// </script>