Arduino - receive string commands via Bluetooth

arduino_bluetooth_string_commands.ino

#include <SoftwareSerial.h>
int led = 2;
SoftwareSerial Bluetooth(7,8); // RX, TX

void setup() {
  pinMode(led, OUTPUT);
  Serial.begin(9600);
  Bluetooth.begin(9600);
  while (!Bluetooth) {
    ; // wait for Bluetooth to connect
  }
  Bluetooth.println("Bluetooth connected");
}

void loop() { // run over and over
  String command;
  if (Bluetooth.available()) {
    // Read command from Bluetooth...
    command = Bluetooth.readStringUntil('\n');
    delay(10);
    // Display the command in the serial monitor
    Serial.println(command);
    if (command.equals("on")) {
      Serial.println("LED turned on");
      digitalWrite(led, HIGH);
      
    }
    else if (command.equals("off")) {
      Serial.println("LED turned off");
      digitalWrite(led, LOW);
    }
  }
  
  if (Serial.available()) {
    // You can also send back data to Bluetooth module from the Serial Monitor...
    Bluetooth.write(Serial.read());
  }
}