Allow any serial port to be used for RC input, while detecting the type of protocol about ardupilot HOT 4 OPEN

Drive-by comment: have you tried sending SBUS to the PPM/SB pins at the end of the servo rail? Is that viable in your build?

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@kalzoo - yes, that works as expected. Build wise I'm not blocked.

Allowing UART/any serial though should work or fail explicitly, so it's clear that RCIN configuration for serial is not support on certain boards.

I think it may also open future avenues, since configuring the protocol as CRSF may allow to send back telemetry to RC transmitters.

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As luck would have it I was just starting to look at fixing the Linux HAL in terms of RC input so that everything goes via the AP_RCProtocol library.

I don't think this is going to work as-is for getting RC input from the NavIO2's UART, there's going to be inversion problems at a guess. I do have a receiver wired up but haven't tried to configure things yet,

Closed by #27000

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@peterbarker this is great!

Took a quick look at the PR. I did similar changes in my attempt to enable any serial to be used on Navio2, and it seemed to struggle with protocol detection. I think your intuition is right that there is going to be an inversion of problems.

If you need testers for this, I can gladly test this branch in June when I return back home from vacation.

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