move_base actionlib client doesn't work in rospy

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Hey,

If I run rtabmap_ros demo_turtlebot_mapping.launch simulation:= true localization:=true and then send 2d nav goals from rviz it works just fine. However when I connect to the actionlib client and send_goal using the MoveBaseGoal msg, then the server never acts on it. Even though my client publishes the goal under /move_base/goal in the full MoveBaseActionGoal msg format.

Any ideas? Thanks, Toby