参见
https://dev.px4.io/v1.9.0/en/simulation/ros_interface.html


打开px4目录
source Tools/setup_gazebo.bash $(pwd) $(pwd)/build/px4_sitl_default
export ROS_PACKAGE_PATH=$ROS_PACKAGE_PATH:$(pwd)
export ROS_PACKAGE_PATH=$ROS_PACKAGE_PATH:$(pwd)/Tools/sitl_gazebo


make px4_sitl_default gazebo


mavros启动：
roslaunch mavros px4.launch fcu_url:="udp://:14540@127.0.0.1:14557"