[gazebo_plugins] Ensure gazebo_ros_camera Publishes After Reset #532
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After a simulation reset, gazebo_ros_camera does not publish images because it is using its internal (and not reset by the world event) last_update_time_ rather than it's parent sensor's update time.
I think all of these issues were fixed in the main gazebo repo in the last major release or two, but it looks like the plugins were not fully updated. There are likely similar issues in the other plugins that should be looked into (by someone who is more familiar with them).