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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server ="broker.hivemq.com";

//membuat object baru untuk mengelola koneksi jaringan
//nama object espClient
WiFiClient espClient;
//membuat object baru untuk mengelola kegiatan mqtt
//nama object client
PubSubClient client(espClient);

void connectWifi();

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

  client.setServer(mqtt_server, 1883);
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // perintah membuat client id agar mqtt broker mengenali board yang kita gunakan
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected");
      // Once connected, publish an announcement...
      client.publish("/sija/", "SIJA A STEMBAYO"); //perintah publish data ke alamat topik yang di setting
      // ... and resubscribe
      client.subscribe("/sija/"); //perintah subscribe data ke mqtt broker
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void loop() {
 
}


void connectWifi() { 
  //konfigurasi koneksi wifi
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password); //koneksi ke jaringan wifi

  //proses koneksi
  while (WiFi.status() != WL_CONNECTED){
    delay(500);
    Serial.print(".");
  }

  //koneksi ke wifi berhasil
  Serial.println("");
  Serial.println("Wifi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}