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How to get the ultrasonic readings from aircraft?

William Wong
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  1.  Call flightController.setStateCallback to register a callback of flightControllerState.
  2. Call flightControllerState.isUltrasonicBeingUsed to get whether the aircraft is using ultrasonic modules.
  3. Call flightControllerState.getUltrasonicHeightInMeters to get the ultrasonic readings in height, valid for 5m.

Note: Some aircraft is using infra-red module instead of ultrasonic module, you can call the same methods.

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