Wokwi - Online ESP32, STM32, Arduino Simulator

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

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

// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "";
int Port = 1883;

WiFiClient espClient;
PubSubClient client(espClient);
const int ledPin = 2;

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: ");
  String stMessage;

  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }
  Serial.println();
  if (stMessage == "on") {
    digitalWrite(ledPin, HIGH);
  }
  else if (stMessage == "off") {
    digitalWrite(ledPin, LOW);
  }
}

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

  WIFIConnect();
  client.setServer(MQTTServer, Port);
  client.setCallback(callback);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  delay(10);
  if (!client.connected()) {
    MQTT_Reconnect();
  }
  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>
//     <img class="anh" src="src" style="width:304px;height:228px">
//     <h1 id="label"></h1>
// </body>
// </html>

// <script>
//     var anh_bat = "https://i.imgur.com/pPqLQx4.png";
//     var anh_tat = "https://i.imgur.com/yRMydZv.png";
//     $('.anh').click(function(){
//         var anhht = $('.anh').attr('src');
//         if(anhht === anh_bat){
//             $('.anh').attr('src', anh_tat);
//             document.getElementById("label").innerHTML="Dang tat";
//             message = new Paho.MQTT.Message("off");
//             message.destinationName = "VLUTE/HIHI";
//             client.send(message);
//         }
//         else{
//             $('.anh').attr('src', anh_bat);
//             document.getElementById("label").innerHTML="Dang bat";
//             message = new Paho.MQTT.Message("on");
//             message.destinationName = "VLUTE/HIHI";
//             client.send(message);
//         }
//     });

//     client = new Paho.MQTT.Client("broker.emqx.io", Number(8083), "99e5f7ce-ec48-4b4d-81dc-b13b4421a28e");

//     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>