#include <WiFi.h>
#include "PubSubClient.h"
const char * MQTTServer = "broker.hivemq.com";
const char * MQTT_Topic = "CGK_LED";
// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "932ac6db-88bc-408b-82ff-ea458718b1d2";
int Port = 1883;
WiFiClient espClient;
PubSubClient client(espClient);
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[3];
int a=0;
for (int i = 0; i < length; i++) {
Serial.print((char)message[i]);
if((char)message[i]==','){
a++;
continue;
}
stMessage[a] += (char)message[i];
}
int led[] = {21,22,23};
for(int i=0;i<3;i++){
int val = stMessage[i].toInt();
digitalWrite(led[i],HIGH);
delay(val);
digitalWrite(led[i],LOW);
}
Serial.println();
}
void setup() {
Serial.begin(9600);
pinMode(21, OUTPUT);
pinMode(22, OUTPUT);
pinMode(23, OUTPUT);
WIFIConnect();
client.setServer(MQTTServer, Port);
client.setCallback(callback);
}
void loop() {
if (!client.connected()) {
MQTT_Reconnect();
}else{
}
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>
// <p>Led đỏ<input type="number" id="do" value=0></input></p>
// <p>Led vàng<input type="number" id="vang" value=0></input></p>
// <p>Led lục<input type="number" id="luc" value=0></input></p>
// <button class="gui">GỬI</button>
// </body>
// </html>
// <script>
// $('.gui').click(function(){
// var ldo=document.getElementById("do").value*1000;
// var lvang=document.getElementById("vang").value*1000;
// var lluc=document.getElementById("luc").value*1000;
// var mes = {"do":ldo, "vang":lvang, "luc":lluc}
// var Str_json= JSON.stringify(mes);
// // alert(Str_json);
// // message = new Paho.MQTT.Message(Str_json);
// var Str = ldo+","+lvang+","+lluc;
// alert(Str);
// message = new Paho.MQTT.Message(Str);
// message.destinationName = "CGK_LED";
// client.send(message);
// });
// client = new Paho.MQTT.Client("broker.hivemq.com", Number(8000), "client-"+Math.round(Math.random(100000000,1000000000)*1000000000));
// 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>