title: SMSLib example for interactive USSD session
body: <p>I have a USSD application that provides an interactive session for users, for example:</p>
  
  <pre><code>User&gt; Dial USSD Shortcode
  Serv&gt; Return Main Menu
  User&gt; Select Option 1, e.g. "View Movie Times"
  Serv&gt; Return List of Cities
  User&gt; Select Option 3, e.g. Mumbai
  Serv&gt; Return List of Cinemas
  User&gt; etc ...
  </code></pre>
  
  <p>I would like to test the USSD Server by using SMSLib to simulate the user.</p>
  
  <p>Are there any example SMSLib code snippets that show how to perform an interactive USSD session with a USSD server?</p>