back method (which was registered with the ADK library as part of the
<code>btStart()</code> method) and processed accordingly. The ADK accessory sends messages back through
the Bluetooth connection using the <code>ADK::btRfcommPortTx()</code> method.
For more details, review the implementations of these methods in the <code>clock.ino</code> sketch.</p>

<h4 id="app-bt-code">Android App Bluetooth Code</h4>

<p>In the ADK 2012 Android app, the code for handling Bluetooth connections is encapsulated in in a
<