title: How to connect peripheral/ BLE device by using identifier?
body: <p>I want to connect the peripheral by using an identifier.
  Can I do it?</p>
  
  <pre><code>centralManager?.connect(peripheral, options: nil)
  </code></pre>
  
  <p>I am scanning devices in one <code>ViewController</code> and Connecting it in another <code>ViewController</code>. </p>
  
  <p><strong>Below is my requirement:</strong></p>
  
  <p>When I scanned device and saved the next time the device that can appear in home screen and directly connected.
  So for this, I use singleton class to access peripheral data from one view to another view. But it always initializes to empty.
  So I want to connect peripheral by using an identifier. 
  I don't know where we store <code>[CBPeripheral]</code> and access it when needed.</p>