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A base local planner is not a node, but it is a plug in used by move_base. So firstly, you need to know what "base local planner" is currently used by move_base by running rosparam get /move_base/base_local_planner . Normally the value could be base_local_planner/TrajectoryPlannerROS.

Assuming TrajectoryPlannerROS, in your Dynamic Reconfigure Client node, you have to specify:

client = dynamic_reconfigure.client.Client("move_base/TrajectoryPlannerROS", timeout=4, config_callback=None)

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