String commandEntered = "";

void setup() {
 Serial.begin(9600);
 Serial.println();
}

void loop() {
  if(Serial.available()>0)
  {
    commandEntered = Serial.readString();
    Serial.println(commandEntered.length());
    commandEntered.remove(commandEntered.length()-1); 
    Serial.println(commandEntered);
  }


  
  if(commandEntered == "on")
  {
    Serial.println(" on Sucess");
    //commandEntered = "";
  }

if(commandEntered == "off")
  {
    Serial.println("off  Sucess");
    //commandEntered = "";
  }


}