Hi Aankin_wang,
According to ROS community support guidelines
http://wiki.ros.org/Support this question should be better asked in
http://answers.ros.org
> Please do not post questions on the discourse.ros.org they should go to ROS Answers.
> ROS Discourse is for news and general interest discussions. ROS Answers provides a forum which can
> be filtered by tags to make sure the relevant people are included and not overload everyone.
Best regards,
Martin
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