@JD-ETH Reading your recent comment:
Hi developers! I am working with APM planner 2.0.25rc, and trying to interface my px4flow to the rapsberry(erle brain) board. After an additional LidarLite v3 sensor is up and running, and calibrating done with usb and QGroundControl, I am getting spiky measurements(10^5) in the apm planner and were not useful. Any ideas? thanks
I suspect that you have power supply problems, how did you connected the Lidar & Px4 Flow?
Look here for a simple I2C hub: How to connect Lidar Lite v3 to Pixhawk PWM?