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koide3 / hdl_localization

Real-time 3D localization using a (velodyne) 3D LIDAR
BSD 2-Clause "Simplified" License
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ERROR: Unable to communicate with master! #3

Closed jeannotes closed 6 years ago

jeannotes commented 6 years ago

Hi, @koide3 when I input that " rosparam set use_sim_time true", there is the error "ERROR: Unable to communicate with master!"? what happened?

koide3 commented 6 years ago

Hi, First of all, you need to start roscore before using ROS. Please see http://wiki.ros.org/ROS/Tutorials/UnderstandingNodes for ROS basics.