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To launch all together you have simply to include all the launch files into a single launch file. (Take a look to this ).

Regarding the rosbag check this answer, the xml syntax for rosbag record -ais: <node pkg="rosbag" type="record" name="recorder" output="screen" args="-a"/> (in "args" you can put all the arguments for that command)

So the whole launch file to launch all you need is:

<launch>

   <include file="$(find turtlebot_gazebo)/launch/turtlebot_world.launch"/>
   <include file="$(find turtlebot_gazebo)/launch/gmapping_demo.launch"/>
   <include file="$(find turtlebot_rviz_launchers)/launch/view_robot.launch"/>
   <include file="$(find turtlebot_teleop)/launch/keyboard_t.launch"/>

   <!-- 
     The rosbag will be saved in the ~./ros folder
   -->
   <node pkg="rosbag" type="record" name="recorder" output="screen" args="-a"/>    
</launch>

Now you can launch it from the terminal as a normal launch file.