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int delay = 1;
var cancellationTokenSource = new CancellationTokenSource();
var token = cancellationTokenSource.Token;
var listener = Task.Factory.StartNew(() =>
    {
        while(true)
        {
            //poll HW
            Thread.Sleep(delay);
            if(token.IsCancellationRequested)
                break;
        }

        //cleanup
    }, token, TaskCreationOptions.LongRunning, TaskScheduler.Default);