#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <PubSubClient.h>

#define led 16
const char *MQTTServer = "broker.hivemq.com";
const char *MQTT_Topic = "IoT/Sunny";
const int mqttPort = 1883;

// Khởi tạo LCD
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Khởi tạo WiFi và MQTT
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());
  
  // Hiển thị trạng thái Wi-Fi trên LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("WiFi connected");
  lcd.setCursor(0, 1);
  lcd.print(WiFi.localIP());
  delay(1000);
}

void MQTT_Reconnect() {
  while (!client.connected()) {
    if (client.connect("ESP32Client")) {
      Serial.print("MQTT Topic: ");
      Serial.print(MQTT_Topic);
      Serial.println(" connected");
      lcd.clear();
      // Hiển thị trạng thái MQTT trên LCD
      lcd.setCursor(0, 0);
      lcd.print("MQTT connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
    lcd.clear();
  }
}
void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.println(topic);
  Serial.print("Message: ");
  
  String receivedMessage;
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    receivedMessage += (char)message[i];
  }
  lcd.setCursor(0,0);
  lcd.print()
  Serial.println(receivedMessage);
}
void setup() {
  lcd.begin(16, 2);
  lcd.init();
  lcd.backlight();
  Serial.begin(115200);
  WIFIConnect();
  client.setServer(MQTTServer, mqttPort);
  client.setCallback(callback);
  client.subscribe(MQTT_Topic);
  pinMode(led, OUTPUT);
}

void loop() {
  if (!client.connected()) {
    MQTT_Reconnect();
  }
  client.loop();
}