title: error: unknown host service for adb wait-for-devices
body: <p>When I run this</p>
  
  <pre><code>$ adb devices
  List of devices attached
  ABCD1234    device
  </code></pre>
  
  <p>I get a normal reply. But this doesn't return anything</p>
  
  <pre><code>$ adb wait-for-devices
  error: unknown host service
  error: unknown host service
  </code></pre>
  
  <p>Usb debugging is enabled.</p>