UDP Discovery with WinRT (Metro-style APIs)

Question

I'm having a lot of trouble trying to implement WS-Discovery in Metro. There doesn't seem to be support for Discovering services:

I'd like to do the following in Metro, but don't think I'm able to from the examples from .NET 4.0 (I'd like to do the equivalent in WinRT):

        DiscoveryClient discoveryClient = new DiscoveryClient(new UdpDiscoveryEndpoint());   
        FindResponse discoveryResponse= discoveryClient.Find(new FindCriteria(typeof(ISampleService)));  
        EndpointAddress address = discoveryResponse.Endpoints[0].Address;   
        SampleServiceClient service = new SampleServiceClient(new BasicHttpBinding(), address); 
        service.Echo("WS-Discovery test");

Does anyone have any ideas?

Looking at the API: http://msdn.microsoft.com/en-us/library/windows/apps/hh454057(v=vs.85).aspx

There doesn't seem to be a whole lot of support for discovery. Would it be best to implement my own discovery mechanism using DatagramSocket?