int servoPin = A2;
Servo myServo;
int servoPos = 0;

void setup() {

  // attaches the servo on the A3 pin to the servo object
  myServo.attach( A2 );

   //Register our Particle to control the servo
  Particle.function("servo", servoControl);

  // Keep a cloud variable for the current position
  Particle.variable(  "servoPos" , &servoPos , INT );


}

int servoControl(String command)
{
   int newPos = command.toInt();
   servoPos = constrain( newPos, 0 , 170);

   myServo.write( servoPos );

   return 1;
}