A ROS and Gazebo Parrot Drone altitude control simulation based on Action client-server communication.
For simulation:
roslaunch ardrone_altitude ardrone_altitude_server.launch
roslaunch ardrone_altitude ardrone_altitude_client.launch
After doing this just write in "" your UP or down in client.
I meant this: "UP", "DOWN"
For finishing the fight:
rostopic pub /drone/land std_msgs/Empty "{}"