Fix minor issue in CapsManager.
The service discovery request must include the node attribute.
Fix #341
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" type="line">
<stroke android:width="1dp"
android:height="2dp"
android:color="#D6F94C" />
<size android:height="1dp" />
</shape>