Blinking On-Board LED

gistfile1.c

int led = D7;

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

void loop() 
{
    
}

int ledControl(String command)
{
   int state = 0;
   // find out the state of the led
   if(command == "HIGH") state = 1;
   else if(command == "LOW") state = 0;
   else return -1;

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