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How to make custom global planner plugin communicate with local planner?

Hi all,

Recently I have been developing my own global planner plugin for research purpose, but since I adapted source code from 3rd party projects, it turns out to be a collage and I may have miss something. I followed the tutorial Writing a global path planner as plugin in ROS and can successfully compile and plan paths as a goal is given via Rviz. There is no issue on TF frames nor any plugin loading problem, global and local costmap can be loaded and shown on Rviz, except that there is no local costmap update at the local planner side. My question is then, what are the crucial components to make both planners communicate ? Why can't my global planner plugin sends anything at all to the local planner? Where and how can I start digging in? Thank you in advance !