* hwIo.Serial extends pyserial to call a callable when data is received instead of drivers having to poll every 50 ms.
* Data is written to thread-safe braille display drivers in the background, thus avoiding blocking the main thread.
* hwIo.Hid provides support for braille displays communicating via USB HID.
Newer models of the APH Refreshabraille have optional HID support. The Baum VarioUltra and Pronto! have USB HID and no USB serial.
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