title: How to set event for changes in power level status of bluetooth devices in Mac OS?
body: <p>I have a simple question.</p>
  
  <p>Can we obtain the battery level of devices paired with mac os programmatically(with Cocoa Frameworks)? Does exists any event that provides this data?</p>
  
  <p>I can get this information with NSTask and ioreg command, but i think isn't the best way.</p>
  
  <p>Thank you for advance,</p>