int ledPin = D2;

void setup()
{
   pinMode(ledPin, OUTPUT);
   digitalWrite(ledPin, LOW);
   Particle.function("led", ledControl);
}
void loop()
{
   // Nothing to do here
}
int ledControl(String command)
{
   int state = LOW;

   if(command == "HIGH"){
       for(int i = 0; i < 3; i++){
           digitalWrite(ledPin, HIGH);
           delay(500);
           digitalWrite(ledPin, LOW);
           delay(500);
       }
   }else if(command == "LOW"){ 
	   state = LOW;
   }else{
	   return -1;
   }

   digitalWrite(ledPin, state);
   return 1;
}