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

const char * MQTTServer = "broker.emqx.io";
const char * MQTT_Topic = "led_mod_4250";

// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "esp32_led_mod";
int Port = 1883;

WiFiClient espClient;
PubSubClient client(espClient);

int ledPin =2 ;


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

  WIFIConnect();
  client.setServer(MQTTServer, Port);
  client.setCallback(callback);
  pinMode(16, OUTPUT);
  pinMode(17, OUTPUT);
  pinMode(18, OUTPUT);
  pinMode(19, OUTPUT);
}

void loop() {
  delay(10);
  if (!client.connected()) {
    MQTT_Reconnect();
  }
  client.loop();
}
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") {
    for(int i=16; i<=19;i++)
    {
      digitalWrite(i, HIGH);
      delay(1000);
    }
    for(int i=16; i<=19;i++)
    {
      digitalWrite(i, LOW);
      delay(1000);
    }
  }
  else if (stMessage == "off") {
    int randNumber = random(16, 19);
    digitalWrite(randNumber, HIGH);
    delay(1000);
     digitalWrite(randNumber, LOW);
  }
  else if (stMessage == "hello")
  {
    for(int i=16; i<=19;i++)
    {
      digitalWrite(i, HIGH);
    }
    delay(3000);
    for(int i=16; i<=19;i++)
    {
      digitalWrite(i, LOW);
    }
  }
}