title: adb logcat hangs with "waiting for device" message
body: <p>When I type <code>adb devices</code> command on terminal, it shows device is connected </p>
  
  <blockquote>
    <p>List of devices attached </p>
    
    <p>0123456789ABCDEF                        device</p>
  </blockquote>
  
  <p>But when I type <code>adb logcat</code> command, it hangs with below message </p>
  
  <blockquote>
    <p>waiting for device</p>
  </blockquote>
  
  <p>Can anybody tell me what is the problem behind this? I test the device on cts.</p>