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

// Konfigurasi WiFi
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// Konfigurasi MQTT
const char* mqtt_server = "broker.hivemq.com";
const int mqtt_port = 1883;
const char* mqtt_topic_temp = "esp32/dht22/temperature";
const char* mqtt_topic_hum = "esp32/dht22/humidity";

// Konfigurasi DHT
#define DHTPIN 33          // Pin data untuk sensor DHT
#define DHTTYPE DHT22     // Tipe sensor DHT22

DHT dht(DHTPIN, DHTTYPE);
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;

void setup() {
  Serial.begin(115200);
  delay(10);
  
  // Menghubungkan ke WiFi
  setup_wifi();
  
  client.setServer(mqtt_server, mqtt_port);
  dht.begin();
}

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 reconnect() {
  // Loop sampai terhubung kembali ke MQTT
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Membuat ID acak
    String clientId = "ESP32MasAtoqhClient-";
    clientId += String(random(0xffff), HEX);
    // Mencoba terhubung
    if (client.connect(clientId.c_str())) {
      Serial.println("connected");
    } 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();

  long now = millis();
  if (now - lastMsg > 2000) {
    lastMsg = now;
    // Membaca suhu dan kelembaban
    float h = dht.readHumidity();
    float t = dht.readTemperature();
    
    // Periksa jika ada kesalahan dalam pembacaan
    if (isnan(h) || isnan(t)) {
      Serial.println("Failed to read from DHT sensor!");
      return;
    }

    // Mempersiapkan pesan dan mempublikasikan
    snprintf (msg, 50, "Temperature: %f", t);
    Serial.print("Publish message: ");
    Serial.println(msg);
    client.publish(mqtt_topic_temp, msg);

    snprintf (msg, 50, "Humidity: %f", h);
    Serial.print("Publish message: ");
    Serial.println(msg);
    client.publish(mqtt_topic_hum, msg);
  }
}