Apply Joint Effort to Gazebo Model [closed]

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Hello,

I am using Gazebo with ROS. I created a model in Gazebo that I was able to successfully send service calls to (to get a joint to spin for example). Specifically, I used the srv file gazebo_msgs/ApplyJointEffort (with a serviceClient node). What I'm trying to do now is get the nodes to be publisher/subscription-based to match another structure I am working with. Is it possible to create my own msg file based off of the gazebo_msgs/ApplyJointEffort srv in order to make a publisher node and still an effort on a joint? I tried doing just that and the publishing happens but there is no response to the model in gazebo. I'm obviously uncertain as to how the gazebo_ros package communication exactly works so any help would be appreciated.

Thank you