Get command from serial

Official Hardware Mega Due
11

even better:

void setup()
{
  Serial.begin(9600, SERIAL_8N1);  		//USB-Prog. Port
  Serial1.begin(9600, SERIAL_8N1);		//Serial Device
  Serial.setTimeout(500);
  Serial1.setTimeout(50);
}

void loop()
{
  if (Serial1.available() > 0) {
  String command = Serial1.readString();
  command.trim(); 
  if (command == "routine1"){
  Serial.println("received-a");
  command = "0";
  }
  if (command == "routine2"){
  Serial.println("received-b");
  command = "0";
  }
  else {
  //do nothing.. for the moment :)
  }
  }
}