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Thanks all. Because gmaping published the tf message that was sent to robot through wifi, but tf messages do not deal with low bandwidth networks well. I install gmapping package into robot, and my computer only is responsible to visualize the built map. All work fine. Reference website: http://wiki.ros.org/tf/Design

Thanks all. Because gmaping published the tf message that was sent to robot through wifi, but tf messages do not deal with low bandwidth networks well. I install gmapping package into robot, and my computer only is responsible to visualize the built map. All work fine. Reference website: http://wiki.ros.org/tf/Design

I revised the provided launch files in gmapping package according to my need. It is easy to ignore "use_sim_time" parameter which usually is set as true in launch file. In here, Its value should be set as false. Reference website: http://wiki.ros.org/Clock