title: Updated Bluez DBUS-API document?
body: <p>I just tried to run a vala bluez example (found in the <a href="https://wiki.gnome.org/Projects/Vala/DBusClientSamples">DbusClientSamples</a> page) and I got this error:</p>
  
  <pre><code>GDBus.Error:org.freedesktop.DBus.Error.UnknownObject:
  Method "DiscoverDevices" with signature "" on interface "org.bluez.Adapter"
  doesn't exist
  </code></pre>
  
  <p>Is the sample using deprecated API? If yes, where can I find an updated document about bluez's DBUS API? All documents I find (by googling) contain the <code>DiscoverDevices</code> method, so I'm quite confused.</p>