Not working command line control in tum_simulator

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Hi, I'm new to ROS and I'm trying to simulate the an AR Parrot drone inside gazebo through tum_simulator. I have ROS indigo, ardrone_autonomy and tum_simulator 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 std_msgs/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/image_raw/compressed/parameter_descriptions
  • /ardrone/bottom/image_raw/compressed/parameter_updates
  • /ardrone/bottom/image_raw/compressedDepth
  • /ardrone/bottom/image_raw/compressedDepth/parameter_descriptions
  • /ardrone/bottom/image_raw/compressedDepth/parameter_updates
  • /ardrone/bottom/image_raw/theora
  • /ardrone/bottom/image_raw/theora/parameter_descriptions
  • /ardrone/bottom/image_raw/theora/parameter_updates
  • /ardrone/bottom/parameter_descriptions
  • /ardrone/bottom/parameter_updates
  • /ardrone/front/camera_info
  • /ardrone/front/image_raw
  • /ardrone/front/image_raw/compressed
  • /ardrone/front/image_raw/compressed/parameter_descriptions
  • /ardrone/front/image_raw/compressed/parameter_updates
  • /ardrone/front/image_raw/theora
  • /ardrone/front/image_raw/theora/parameter_descriptions
  • /ardrone/front/image_raw/theora/parameter_updates
  • /ardrone/front/parameter_descriptions
  • /ardrone/front/parameter_updates
  • /clock
  • /gazebo/link_states
  • /gazebo/model_states
  • /gazebo/parameter_descriptions
  • /gazebo/parameter_updates
  • /gazebo/set_link_state
  • /gazebo/set_model_state
  • /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!