#include <IRremote.h>

#define IR_PIN 4
#define IR_LED_PIN 5

void setup() {

  Serial.begin(115200);

  // Start IR Receiver
  IrReceiver.begin(IR_PIN);

  // Start IR Sender
  IrSender.begin(IR_LED_PIN);

  Serial.println("IR Transmitter Ready");
  Serial.println("Hello, ESP32!");
}

void loop() {

  // Check if data received
  if (IrReceiver.decode()) {

    // Print command in HEX
    Serial.println(IrReceiver.decodedIRData.command, HEX);

    // Prepare receiver for next signal
    IrReceiver.resume();
  }

  // Send NEC signal
  IrSender.sendNEC(0x00, 0x18, 0);

  delay(1000);
}