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Since on the commandline, you're just calling a commandline version of a ROS service, to do it from a ROS node, you want to use the service SetModelState and call it via roscpp. The tutorial on how to do this can be found here.

Since on the commandline, you're just calling a commandline version of a ROS service, to do it from a ROS node, you want to use the service SetModelState and call it via roscpp. The tutorial on how to do this can be found here.

ros::ServiceClient client = n.serviceClient<gazebo_msgs::SetModelState>("/gazebo/SetModelState");

Since on the commandline, you're just calling a commandline version of a ROS service, to do it from a ROS node, you want to use the service SetModelState and call it via roscpp. The tutorial on how to do this can be found here.

EDIT: The gazebo/SetModelState documentation says to use the service located in the package gazebo_msgs instead of the one in the gazebo package.

Thus, your code should look like this:

ros::ServiceClient client = n.serviceClient<gazebo_msgs::SetModelState>("/gazebo/SetModelState");

The main reason your code wouldn't compile is because you used <gazebo::ModelState> instead of <gazebo::SetModelState>, just so you know what that error was.

#include <gazebo/SetModelState.h>
...
ros::ServiceClient client = n.serviceClient<gazebo::SetModelState>("/gazebo/SetModelState");

Since on the commandline, you're just calling a commandline version of a ROS service, to do it from a ROS node, you want to use the service SetModelState and call it via roscpp. The tutorial on how to do this can be found here.

EDIT: The gazebo/SetModelState documentation says to use the service located in the package gazebo_msgs instead of the one in the gazebo package.

Thus, your code should look like this:

ros::ServiceClient client = n.serviceClient<gazebo_msgs::SetModelState>("/gazebo/SetModelState");

The main reason your code wouldn't compile is because you used <gazebo::ModelState> instead of <gazebo::SetModelState>, just so you know what that error was.

EDIT2: If you're using Diamondback, use the gazebo package instead of the gazebo_msgs package. I apologize for the mistake. You should then use:

#include <gazebo/SetModelState.h>
...
ros::ServiceClient client = n.serviceClient<gazebo::SetModelState>("/gazebo/SetModelState");