New hub

FeedHub.cs

public class FeedHub : Hub
{
  private readonly IMachineState machineState;
  private readonly ISampleWriter sampleWriter;

  public FeedHub(IMachineState machineState, ISampleWriter sampleWriter)
  {
    this.machineState = machineState;
    this.sampleWriter = sampleWriter;
  }

  public void ResetCount()
  {
    // Reset the state, and start a new data file
    machineState.ZeroCount();
    sampleWriter.StartNewFile();
  }
}