The SignalR.NET client creates the TPL (http://msdn.microsoft.com/en-us/library/dd460717(VS.100).aspx) and works only with .NET 4.0 and higher. There was a version of .NET 3.5, but we are deprecated in the latest version. You can, of course, write a client for a compact structure, but we have no plans to write at the moment.
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