https://mavsdk.mavlink.io/develop/en/index.html
https://github.com/mavlink/MAVSDK-Python
https://mavsdk.mavlink.io/develop/en/cpp/
https://mavsdk.mavlink.io/develop/en/api_reference/classmavsdk_1_1_action.html
https://github.com/mavlink/MAVSDK
http://dev.px4.io/v1.9.0/en/robotics/dronekit.html
http://dev.px4.io/v1.9.0/en/middleware/mavlink.html
http://ardupilot.org/copter/docs/common-px4flow-overview.html
http://ardupilot.org/copter/docs/common-openmv-optflow.html
http://dev.px4.io/v1.9.0/en/advanced/computer_vision.html#optical_flow
https://docs.px4.io/v1.9.0/en/sensor/optical_flow.html
https://docs.px4.io/v1.9.0/en/sensor/rangefinders.html
https://docs.px4.io/v1.9.0/en/sensor/px4flow.html
https://github.com/PX4/Flow
https://github.com/PX4/OpticalFlow
https://docs.px4.io/master/en/advanced_config/tuning_the_ecl_ekf.html#optical-flow
https://dev.px4.io/v1.9.0/en/companion_computer/pixhawk_companion.html


https://dev.px4.io/v1.9.0/en/companion_computer/pixhawk_companion.html
https://mavlink.io/en/messages/common.html
https://dev.px4.io/v1.9.0/en/robotics/dronekit.html
https://book.openmv.cc/example/18-MAVLink/mavlink-apriltags-landing-target.html
https://mavlink.io/en/services/
https://mavlink.io/en/messages/common.html#MAV_AUTOPILOT_GENERIC_WAYPOINTS_AND_SIMPLE_NAVIGATION_ONLY
https://github.com/Microsoft/AirSim/blob/master/docs/px4_setup.md#setting-up-px4-hardware-in-loop
https://microsoft.github.io/AirSim/docs/px4_setup/
https://github.com/microsoft/AirSim/blob/master/docs/custom_drone.md#airlib-on-a-real-drone
https://ayangyou.com/2017/11/05/automatictracking1/
https://discuss.ardupilot.org/t/mavlink-step-by-step/9629
https://dev.px4.io/v1.9.0/en/apps/hello_sky.html
https://www.ardusub.com/developers/pymavlink.html
https://mavlink.io/en/mavgen_python/
https://zhuanlan.zhihu.com/p/54471146
https://sublimerui.top/archives/d508d500.html
https://sublimerui.top/archives/f10b0e1a.html
https://towardsdatascience.com/line-follower-robot-using-cnn-4bb4f297c672
https://docs.px4.io/v1.9.0/en/flight_controller/pixhawk.html
https://github.com/Microsoft/AirSim/blob/master/docs/px4_setup.md
https://mavsdk.mavlink.io/develop/en/index.html
https://dev.px4.io/v1.9.0/en/simulation/hitl.html
https://dev.px4.io/v1.9.0/en/simulation/jmavsim.html
http://ardupilot.org/copter/docs/common-openmv-optflow.html
https://docs.px4.io/v1.9.0/en/sensor/optical_flow.html
https://github.com/PX4/Firmware/tree/master/src/drivers