No further work is being done on the ASP.NET SignalR Java client. There is new work for the ASP.NET Core SignalR Java client located at https://github.com/aspnet/SignalR, in the https://github.com/aspnet/SignalR/tree/release/2.2/clients/java/signalr folder.
As a result, we're not accepting anymore changes to this project. Please file any new issues on https://github.com/aspnet/SignalR.