Keywords: TOPIC_HEIGHT_FUSION, height_above_takeoff
The telemetry TOPIC used by height_above_takeoff in the ROS demo is TOPIC_HEIGHT_FUSION. This TOPIC does not support A3/N3/M600, only M210. Therefore, the value obtained on A3/N3/M600 is 0.
In addition, the TOPIC: TOPIC_HEIGHT_FUSION obtains the relative ground height, and the relative ground height <10m is valid. Vision and ultrasonic sensors cannot be simulated in the simulator, and the actual value can only be obtained in real flight.
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