title: How can I create a secured connection to BLE peripheral through CBCentralManager?
body: <p>I am new to iOS and Core Bluetooth. What I would like to know is how to create a secured connection to the device. </p>
  
  <p>What I understand is:</p>
  
  <pre><code>[manager connectPeripheral:peripheral options:nil] 
  </code></pre>
  
  <p>is the API provided to connect to the BLE device. From this, how do I establish a secured connection?</p>