minichlink: Active polling of Ardulink device #501
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Baldanos
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Hi !
This PR allows to actively poll an Ardulink device instead of waiting for the '!' character.
The poll is done using the '?' command, which returns a '+' character.
Submitting this because the tool I develop uses a bus pirate-like interface. Switching to ardulink mode requires the user quit the terminal to run minichlink, and the initial '!' usually gets lost.
I also thought about changing the serial port behavior in minichlink (using timeouts on serial reads), but this solution is simplier and works on the original ardulink as well.