int led1 = D2;

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

}

void loop() {
    //nothing here
    

}

int ledControl(String command){
    int number = atoi(command);
    if (number != 0){
        for(int b=0; b<number; b++){
            digitalWrite(led1, HIGH);
            delay(500);
            digitalWrite(led1, LOW);
            delay(500);
        }
        return 1;
    }else{
        return -1;
    }
}