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;
   int num = command.toInt();
    for(int i = 0; i < num; i++){
           digitalWrite(ledPin, HIGH);
           delay(500);
           digitalWrite(ledPin, LOW);
           delay(500);
   }

   digitalWrite(ledPin, state);
   return 1;
}