#define RXD2  16  // aka GPIO16
#define TXD2  17  // aka GPIO17

void setup() {
  // put your setup code here, to run once:
  Serial2.begin(38400, SERIAL_8N1, RXD2, TXD2);
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
  while( Serial2.available()) {
    Serial.print(char(Serial2.read()));
  }
}