int led1 = D2;

void setup() {
    
    pinMode(led1, OUTPUT);
    digitalWrite(led1, LOW);
    Particle.function("led", ledControl);

}

void loop() {
    //nothing here
    

}

int ledControl(String command){
    int state = LOW;
    if(command == "ON"){
        for (int b = 0; b<3; b++){
            digitalWrite(led1, HIGH);
            delay(500);
            digitalWrite(led1,LOW);
            delay(500);
        }
    } else {
        return -1;
    }
    
    digitalWrite(led1, state);
    return 1;
}