USB communication changes

[Jef Driesen]

On 11/08/2020 19:22, Jef Driesen wrote:
> Native USB communication (used only by the Atomic Aquatics Cobalt backend) was
> not yet ported to the I/O stream interface. This has now changed because I just
> pushed a new USB based I/O transport implementation the libdivecomputer master
> branch. This means the application is now responsible for setting up the USB I/O
> stream, just like all others transports. The Atomic Aquatics Cobalt backend does
> no longer open the USB device internally. Passing a NULL pointer for the
> iostream will no longer work!
> 
> The advantage is that an application can now also use a custom implementation on
> platforms where libusb isn't available (iOS) or doesn't work very well due to
> permission problems (Android).

Attached is a patch with the necessary changes for subsurface.

Jef
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