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Given your output, you have no subscription from the slam_gmapping
node to any laserscanner message. You can see this from the following line:
* /base_scan [unknown type]
* /tf [tf2_msgs/TFMessage]
It should read
* /base_scan [sensor_msgs/LaserScan]
* /tf [tf2_msgs/TFMessage]
Then you know, that there is actually (at least) one of each, subscriber and publisher, open on this topic. So you most probably have a wrong remapping on the scan topic.
If you need more help, please upload the relevant parts of your launch file and probably the rosbag play
command you use.