void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  mainMenu();

}

void loop() {
  // put your main code here, to run repeatedly:

}

void mainMenu() {
  Serial.println("Configs");
  Serial.println("1. Device");
  Serial.println("2. Quit");

  if (Serial.available()) {
    char ch = Serial.read();
    if (ch >= '0' && ch <= '9') {
      Serial.println(ch);
    }
  }
}