Hi nicogou,
Thanks for your inquiry. Did you refer to github example code https://github.com/boschsensortec/BHY2_SensorAPI/blob/master/examples/klio_selflearning/klio.c? If yes, could we know which line you get returned KLIO_DRIVER_ERROR_UNDEFINED value? In the SDK, the interface of klio is not open to the public.
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