Hi, I'm new to ROS and I'm trying to simulate the an AR Parrot drone inside gazebo through tumsimulator. I have ROS indigo, ardroneautonomy and tumsimulator installed. The problem is that when I create the ardrone test world it is correctly visualized in gazebo but than I can't control the motion of the drone by the command line. For instance, when I type `rostopic pub -1 /ardrone/takeoff stdmsgs/Empty`, the drone doesn't move. Only sensor monitoring commands are working. The list of my active topics is the following:

• /ardrone/bottom/camera_info
  • /ardrone/bottom/image_raw
  • /ardrone/bottom/image_raw/compressed
  • /ardrone/bottom/imageraw/compressed/parameterdescriptions
  • /ardrone/bottom/imageraw/compressed/parameterupdates
  • /ardrone/bottom/image_raw/compressedDepth
  • /ardrone/bottom/imageraw/compressedDepth/parameterdescriptions
  • /ardrone/bottom/imageraw/compressedDepth/parameterupdates
  • /ardrone/bottom/image_raw/theora
  • /ardrone/bottom/imageraw/theora/parameterdescriptions
  • /ardrone/bottom/imageraw/theora/parameterupdates
  • /ardrone/bottom/parameter_descriptions
  • /ardrone/bottom/parameter_updates
  • /ardrone/front/camera_info
  • /ardrone/front/image_raw
  • /ardrone/front/image_raw/compressed
  • /ardrone/front/imageraw/compressed/parameterdescriptions
  • /ardrone/front/imageraw/compressed/parameterupdates
  • /ardrone/front/image_raw/theora
  • /ardrone/front/imageraw/theora/parameterdescriptions
  • /ardrone/front/imageraw/theora/parameterupdates
  • /ardrone/front/parameter_descriptions
  • /ardrone/front/parameter_updates
  • /clock
  • /gazebo/link_states
  • /gazebo/model_states
  • /gazebo/parameter_descriptions
  • /gazebo/parameter_updates
  • /gazebo/setlinkstate
  • /gazebo/setmodelstate
  • /ground_truth/state
  • /joint_states
  • /rosout
  • /rosout_agg
  • /tf
  • /tf_static

The topic /ardrone/takeoff is not active in that moment but it's existing. Is there anyone who had the same problem? Thank you!