title: iOS CoreBluetooth indicate characteristic read receipt
body: <p>Per <a href="https://developer.apple.com/documentation/corebluetooth/cbcharacteristicproperties/1519085-indicate" rel="nofollow noreferrer">the docs</a>, the Core Bluetooth Characteristic of type <code>indicate</code> is: </p>
  
  <blockquote>
    <p>A property that indicates the peripheral permits notifications of the characteristic’s value, with a response from the central to indicate receipt of the notification.</p>
  </blockquote>
  
  <p>How does the central perform the receipt of the notification?  Is this handled internally by Core Bluetooth, or is there an API for this? Or is it expected that the Bluetooth device provide a way to do this, such as through a write characteristic?</p>