title: How do you adb to bluestacks 4?
body: <p>I'd like to connect to android emulator on bluestacks 4 with adb. 
  but I've got an error with <code>adb.exe -s emulator-5554 shell</code></p>
  
  <p>checking devices. </p>
  
  <pre><code>$ adb.exe devices
  List of devices attached
  BH901...      device
  CB512...      unauthorized
  
  
  
  
  
  emulator-5554   device
  </code></pre>
  
  <p>once I shutdown bluestacks window, the <code>emulator-5554</code> will be hidden from above command's result. thus I think <code>emulator-5554</code> means bluestacks.</p>
  
  <p>then commnad as below to use adb.</p>
  
  <pre><code>$ adb.exe -s emulator-5554 shell
  error: closed
  </code></pre>
  
  <p>but as you know, an error occured.</p>