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Warnings encountered while simulating erratic

Hi.I am using ROS fuerte on Ubuntu 12.04. While I was running erratic on gazebo, using

 roslaunch erratic_navigation_apps demo_2dnav_slam.launch

I encountered the following warnings.

[ WARN] [1354625870.495205787, 49.740000000]: Message from  
[/base_laser_self_filter] has a non-fully-qualified frame_id [base_footprint].  
Resolved locally to [/base_footprint].  This is will likely not work in 
multi-robot systems.  This message will only print once.
[ WARN] [1354625870.495682174, 49.740000000]: Message from 
[/base_laser_self_filter] has a non-fully-qualified frame_id [base_footprint]. 
Resolved locally to [/base_footprint].  This is will likely not work in 
multi-robot systems.  This message will only print once.
[ WARN] [1354625910.922358012, 65.418000000]: The /base_scan/marking observation 
buffer has not been updated for 0.24 seconds, and it should be updated every 
0.20 seconds.
[ WARN] [1354625988.636103668, 91.693000000]: The /base_scan/marking observation 
buffer has not been updated for 0.21 seconds, and it should be updated every 
0.20 seconds.
[ WARN] [1354625993.083708417, 93.493000000]: The /base_scan/marking observation 
buffer has not been updated for 0.20 seconds, and it should be updated every 0.20 
seconds.
[ WARN] [1354625996.023810230, 94.695000000]: The /base_scan/marking observation 
buffer has not been updated for 0.20 seconds, and it should be updated every 0.20 
seconds.

In RVIz, I am unable to visualise the robot_footprint and other sensor's data. My guess is that the warnings are the reasons for that. Any ideas how can I resolve this? Thank you.

Warnings encountered while simulating erratic

Hi.I am using ROS fuerte on Ubuntu 12.04. While I was running erratic on gazebo, using

 roslaunch erratic_navigation_apps demo_2dnav_slam.launch

I encountered the following warnings.

[ WARN] [1354625870.495205787, 49.740000000]: Message from  
[/base_laser_self_filter] has a non-fully-qualified frame_id [base_footprint].  
Resolved locally to [/base_footprint].  This is will likely not work in 
multi-robot systems.  This message will only print once.
[ WARN] [1354625870.495682174, 49.740000000]: Message from 
[/base_laser_self_filter] has a non-fully-qualified frame_id [base_footprint]. 
Resolved locally to [/base_footprint].  This is will likely not work in 
multi-robot systems.  This message will only print once.
[ WARN] [1354625910.922358012, 65.418000000]: The /base_scan/marking observation 
buffer has not been updated for 0.24 seconds, and it should be updated every 
0.20 seconds.
[ WARN] [1354625988.636103668, 91.693000000]: The /base_scan/marking observation 
buffer has not been updated for 0.21 seconds, and it should be updated every 
0.20 seconds.
[ WARN] [1354625993.083708417, 93.493000000]: The /base_scan/marking observation 
buffer has not been updated for 0.20 seconds, and it should be updated every 0.20 
seconds.
[ WARN] [1354625996.023810230, 94.695000000]: The /base_scan/marking observation 
buffer has not been updated for 0.20 seconds, and it should be updated every 0.20 
seconds.

In RVIz, My question is how should I am unable to visualise get rid of the robot_footprint and other sensor's data. My guess is that the warnings are the reasons for that. Any ideas how can I resolve this? warning for observation buffer. Thank you.