Indicates that it has been a while since the feed received any good frames.
public bool Stale { get; }
true to indicate that it has been a while since the feed received any good frames.
The feeder relies on receiving consumptive frames for the same ID card with minimum time between each frame.
However, it can internally handle substantial time gaps between frames and take decisions according to the frames alignment.
Stale reports if there has been a time gap > 10 seconds
since the last frame was received.