ROS Resources: Documentation | Support | Discussion Forum | Index | Service Status | ros @ Robotics Stack Exchange
Ask Your Question


asked 2014-05-14 08:39:59 -0600

smart engineer gravatar image

when i try to make sure that my monocular camera is publishing images over ROS by typing the """rostopic list """ the following error appear """ERROR: Unable to communicate with master! """""" , How Can I solve that ??

edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted

answered 2014-05-14 08:49:56 -0600

sterlingm gravatar image

That means roscore is not running or you have some network issues. Check if roscore is running and if the problem persists, refer to for problems with your network.

edit flag offensive delete link more


Thnx for your help ; I run the "" roscore" the topics published """/camera/camera_info /camera/image_raw""" but the actual output for me is ""/rosout /rosout_agg """ ,,, How can I solve this ???

smart engineer gravatar image smart engineer  ( 2014-05-14 08:59:06 -0600 )edit

Just to clarify - you expect the output to be "/camera/camera_info /camera/image_raw", but the actual output is "/rosout /rosout_agg"? If so, you need to make sure the nodes that publish or subscribe to "/camera/camera_info /camera/image_raw" are running. Run roscore and "rosnode list" to check.

sterlingm gravatar image sterlingm  ( 2014-05-14 09:02:56 -0600 )edit

the only output after ""rosnode list" is """ /rosout """ ????

smart engineer gravatar image smart engineer  ( 2014-05-14 09:20:27 -0600 )edit

Okay so that means you haven't started your nodes. You need to do "rosrun package_name node_name". Read the node tutorial: it should help you.

sterlingm gravatar image sterlingm  ( 2014-05-14 09:24:21 -0600 )edit

Question Tools

1 follower


Asked: 2014-05-14 08:39:59 -0600

Seen: 432 times

Last updated: May 14 '14