XPLMAvionicsKeyboard_f

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typedef int (* XPLMAvionicsKeyboard_f)(
                         char                 inKey,
                         XPLMKeyFlags         inFlags,
                         char                 inVirtualKey,
                         void *               inRefCon,
                         int                  losingFocus);

Key callback called when your device is popped up and you’ve requested to capture the keyboard. Return 1 to consume the event, or 0 to let X-Plane process it (for stock avionics devices).