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

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* mqttServer = "broker.hivemq.com";
const int mqttPort = 1883;
const char* mqttUser = "";
const char* mqttPassword = "";
const char* mqttClientID = "esp32-client";

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(115200);
  
  // Mengaktifkan mode WiFi Station (STA)
  WiFi.mode(WIFI_STA);
  
  // Menyambungkan ke jaringan WiFi
  Serial.print("Connecting to WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println(" connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  
  // Menghubungkan ke server MQTT
  client.setServer(mqttServer, mqttPort);
  while (!client.connected()) {
    Serial.print("Connecting to MQTT Server...");
    if (client.connect(mqttClientID, mqttUser, mqttPassword)) {
      Serial.println(" connected");
    } else {
      Serial.print(" failed, rc=");
      Serial.print(client.state());
      Serial.println(" retrying in 5 seconds");
      delay(5000);
    }
  }
  
  // Mengirim pesan uji ke topik "mqtt/ujicoba"
  client.publish("mqtt/ujicoba", "Hi, saya ESP32!");
}

void loop() {
  client.loop();
}