Ramapping ros-control controller topic

edit

I am using a force controller integrated with ros-control to control a simulated robot arm. The controller relies on data from an ft sensor publishing to /robot_controller/ft_sensor_wrench. I am using the gazebo ft sensor plugin described here to get ft data. The plugin publishes to a topic called /gazebo_ft_wrench. How do I make the force controller subscribe to /gazebo_ft_wrench rather than /robot_controller/ft_sensor_topic? I have tried to remap using:

<remap from="/robot_controller/ft_sensor_wrench" to="gazebo_ft_wrench" />

in the launch file, before loading the controller using controller_manager, but this does not work.

Edit: Adding the code from my launch file.

1) Adding the remap tag before loading the controller:

<remap from="/robot_controller/ft_sensor_wrench" to="gazebo_ft_wrench" /><node name="robot_controller_spawner" pkg="controller_manager" type="controller_manager" args="load robot_controller" respawn="false" output="screen"/>

2) Adding the remap tag inside the node block (as suggested in the comments):

<node name="robot_controller_spawner" pkg="controller_manager" type="controller_manager" args="load robot_controller" respawn="false" output="screen"><remap from="/robot_controller/ft_sensor_wrench" to="/gazebo_ft_wrench"/></node>