While the FTP data is being processed, the USB is continually monitored
and FTP processing is interrupted to service the USB.

Reading that rings the bell in my head !
If you are using polling, then this is bad design.
Use two separate threads to handle USB and to handle FTP. Each thread should work purely asynchronous (as ICS does) or work blocked on a read or write (for the USB). Never use a polling loop.

The author of the freeware multi-tier middleware MidWare
The author of the freeware Internet Component Suite (ICS)

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