title: 'unauthorized user' reponse from philips-hue bridge
body: <p>Now I'm trying to control Hue bridge with IoTivity framework.</p>
  
  <p>When I send GET message from MPMClientSample (MiniPluginManager)
  response message was </p>
  
  <pre><code>[{
      "error": {
          "type": 1,
          "address": "/lights",
          "description": "unauthorized user"
      }
  }]
  </code></pre>
  
  <p>What should I use 'username' for this?
  Now I'm using 'newdeveloper' as default value.</p>