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This whole thing also goes against usual ROS usage patterns. For one time things a service call might be better suited. It might be a good idea to state what you want to actually achieve with this.

If you want to stop a node there are some possibilities.

• Nodes are binaries, you can just kill them with a normal system command (you'll need to know the pid/name or figure it out)
• rosnode kill <node> kills the node with name <node>.
• If you don't know the node's name for the setup, but have some kind of ROS configurable connection you can send a shutdown service/message that would trigger that node to end itself manually.