Neil,=20
for cross platform development I would suggest QT framework.  I have
developed for Linux and Windows using it, it also has support for android
and other OSes, although I have not tried that. =20

Serial port communication is trivial to setup and is platform independent
(withing limitations of the platform, of course, e.g. baud rate selection).=
 =20

Best,

Sergey=20

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