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My understanding is that you're thinking to use a value taken from ROS Parameter server in order to configure the roslaunch. AFAIK that usecase is not a supported by the core toolset. Similar to #q297109 you might need to add a step before your roslaunch starts.

If the options for the switch based on the user's input can be described by using group, you can pass an arg when your program execute roslaunch.

My understanding is that you're thinking to use a value taken from ROS Parameter server in order to configure the roslaunch. AFAIK that usecase is not a supported by the core toolset. Similar to #q297109 you might need to add a step before your roslaunch starts.

If the options for the switch based on the user's input can be described grouped together by using group, element, you can pass an arg when your program execute roslaunch.