MotorConfigSet sets a Motor's
(motor) configuration using data from the structure
pointed to by config, and also using data from the
implementation-specific structure pointed to by external
(if external is not NULL).
The configuration information in external is in
addition to the configuration information in config,
i.e, the configuration information in config and in
external is not the same information. Note that config
or external can be NULL (but not both NULL).
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