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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";

const int ledPin = 5; // Chân điều khiển đèn LED

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(115200);
  pinMode(ledPin, OUTPUT); // Đặt chân điều khiển đèn LED là OUTPUT
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  
  int value = atoi((char*)payload); // Chuyển đổi payload thành số nguyên
  
  if (strcmp(topic, "/ThinkIOT/Servo-nodered") == 0) {
    Serial.println(value);
    if (value == 1) {
      digitalWrite(ledPin, HIGH); // Bật đèn LED nếu giá trị là 1
    } else {
      digitalWrite(ledPin, LOW); // Tắt đèn LED nếu giá trị là 0
    }
  }
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESPClient")) {
      Serial.println("connected");
      client.subscribe("/ThinkIOT/Servo-nodered");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  delay(100);
}