freenect /camera/depth/points topic not published under a group namespace tag.

edit

Hi! I am currently running Octomap on my Qbot using ROS kinetic and Ubuntu 16.04. (My plan is to run ROS navigation stack using the built octomap and create a multi-robot system) Because of the multi-robot networking requirement I need to name my robots uniquely, and I tried doing this using both <include> and <group> tags. While my launch file works as expected without the namespace parameter, it does not give the expected result with the namespace. I generated rqt_graphs for my working and not working programs and figured out that /camera/depth/points topic is not published so that it can output into the octomap_server node.

This is my first launch file which works accurately.

    <launch>
        <!-- run kobuki base -->
        <include file="$(find kobuki_node)/launch/minimal.launch"/>

        <!-- tf config -->
        <include file="$(find multi_robot_exploration)/launch/tf_pub.launch" />

        <!-- run kinect -->
        <include file="$(find freenect_launch)/launch/freenect.launch"/>

        <!-- run octomap_server -->
        <include file="$(find octomap_server)/launch/octomap_mapping.launch"/>
</launch>

And here is the relevant rqt_graph (generated without running RViz)

This is my second launch file which I wrote by including the group tag and a namespace

     <launch>
    <group ns="qbot1">
        <!-- run kobuki base -->
        <include file="$(find kobuki_node)/launch/minimal.launch"/>

        <!-- tf config -->
        <include file="$(find multi_robot_exploration)/launch/tf_pub.launch" />

        <!-- run kinect -->
        <include file="$(find freenect_launch)/launch/freenect.launch"/>

        <!-- run octomap_server -->
        <include file="$(find octomap_server)/launch/octomap_mapping.launch"/>
    </group>
</launch>

And this is the relevant rqt_graph

It looks like the /camera/depth/points topic is not available in the second setting, and hence it cannot publish to octomap_server. But it is available when I launch the file without <group> tag. Does anybody know what I am doing wrong here?

Note: I use the standard ROS packages for Octomap, kobuki_node, and freenect drivers. I have located all of them within my working directory and sourced them. I have tried adding namespace variable as different include tags also.