Hello, I am using the pioneer3dx model in Gazebo from https://github.com/SD-Robot-Vision/PioneerModel.git and I couldn't find the robot publishing any sonar data. When I type rostopic list while the robot is moving in simulation, the topics that print out are:

/clock /cmdvel /gazebo/linkstates /gazebo/modelstates /gazebo/parameterdescriptions /gazebo/parameterupdates /gazebo/setlinkstate /gazebo/setmodelstate /odom /p3dx/baseposegroundtruth /p3dx/laser/scan /rosout /rosout_agg /statistics /tf

But when I look through each topic, I do not find any sonar data. I was wondering if I had somehow missed the sonar data, or the topic publishing the sonar? And if I didn't, how do I add sonar sensors to this model? Or is there already a model with the sonar sensors? Thank you so much!