#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(115200);   // receive from Node 1

  lcd.init();
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("Waiting UID...");
}

void loop() {

  if (Serial.available()) {

    String uid = Serial.readStringUntil('\n');
    uid.trim();

    Serial.println(uid);  // debug

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("UID:");

    lcd.setCursor(0, 1);
    lcd.print(uid);
  }
}