Hello,
I have been following the ROS gmapping tutorial, *How to Build a Map Using Logged Data*, and have run into a problem where the sim clock is not being published when I try to save a map from a bag file.
- I set the ues_sim_time parameter to true.
- Am running gmapping slam_gmapping.
- The bag file succesfully played back using: rosbag play --clock myBagFile.bag
- but after processing the bag file, I use rosrun map_server map_saver -f myMap and I get the message: *Waiting for the map*
The /Clock topic is not being published. Isn't map_server map_saver supposed to publish the /clock topic?
**From roswtf:**
WARNING The following node subscriptions are unconnected:
* /slam_gmapping:
* /tf_static
* /clock
* /scan
* /rostopic_5755_1528131980494:
* /clock
* /map_saver:
* /clock
WARNING No tf messages
Found 1 error(s).
ERROR /use_simtime is set but no publisher of /clock is present
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