title: Backdoor concept in Appium (like in Calabash) for UI testing
body: <p>In Calabash you can implement a backdoor, i.e., a way to call a method in the app delegate during test case execution. This makes it possible to simulate non-UI/external events like a Bluetooth device to appear/disappear, etc. in simulator.</p>
  
  <p>(I understand the backdoor concept is possible because Calabash-server is linked into the executable. Appium executes tests on the an untouched executable.)</p>
  
  <p>Is a similar concept available in Appium? If not what are the alternatives then?</p>
  
  <p>(I couldn't find anything in the Appium documentation.)</p>