I was trying to run gazebo px4 simulation with irisrealsense and irisstereo model. When i launched it , model was successfully spawned and in gazebo topic visualizer both left and right images were there. But none of the rostopic have any data regarding depth points.These warnings were there when i roslaunched.

[ WARN] [1591106359.863785665]: The input topic '/stereo/left/image' is not yet advertised
[ WARN] [1591106359.864221490]: The input topic '/stereo/left/camera_info' is not yet advertised
[ WARN] [1591106359.864242441]: The input topic '/stereo/right/image' is not yet advertised
[ WARN] [1591106359.864264099]: The input topic '/stereo/right/camera_info' is not yet advertised

I havent edited anything inside the model file.

<!-- vehicle pose -->

<!-- vehicle model and world -->

<include file="$(find gazebo_ros)/launch/empty_world.launch">
    <arg name="gui" value="$(arg gui)"/>
    <arg name="world_name" value="$(arg world)"/>
    <arg name="debug" value="$(arg debug)"/>
    <arg name="verbose" value="$(arg verbose)"/>
    <arg name="paused" value="$(arg paused)"/>
    <arg name="respawn_gazebo" value="$(arg respawn_gazebo)"/>
</include>
    <!-- gazebo model -->
<node name="$(anon vehicle_spawn)" pkg="gazebo_ros" type="spawn_model" output="screen" args="-sdf -file $(arg sdf) -model $(arg vehicle) -x $(arg x) -y $(arg y) -z $(arg z) -R $(arg R) -P $(arg P) -Y $(arg Y)"/>

<!-- Define a static transform from a camera internal frame to the fcu for every camera used -->

<!-- Launch stereoimageproc node which runs OpenCV's block matching -->

This is the launch file i am using. Do i have to add something to make /stereo input topics to actually publish anything to stereo node?