title: Make a simple iphone app that can connect another bluetooth device
body: <p>I know some basic about iOS programming, now i want to connect my app to another non iphone device e.g. connecting to a bluetooth device that can control a light bulb on and off, or control any furnitures. </p>
  
  <p>My question is, besides iOS xcode, what kind of program i need to learn in order to achieve my goal? </p>
  
  <p>Is there any sources that i can learn from it? </p>