int ledPin = D2;

void setup() {
     pinMode(ledPin, OUTPUT);
     digitalWrite(ledPin, LOW);
 
   Particle.function("led", ledControl);
 
}

int ledControl(String command)
{
   int state = LOW;

   // find out the state of the led
   if(command == "HIGH"){
	    for (int x = 1; x <= 3; x++){
      digitalWrite(ledPin, HIGH);
      delay(500);
      
      digitalWrite(ledPin, LOW);
      delay(500);
  }
        	   
   }else if(command == "LOW"){ 
	   state = LOW;
   }else{
	   return -1;
   }

   // write to the appropriate pin
   digitalWrite(ledPin, state);
   return 1;
}