rostopic pub /topic_name sensor_msgs/JointState [arguments]

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Hi !

I run this command line:

rostopic pub servo sensor_msgs/JointState '{header: {seq:0, stamp: {secs:0, nsecs:0}, frame_id:""}, name:["art1"],position:[150.0], velocity:[0.0], effort:[0.0]}' --once

and i get the following error:


emilio@emilio-N61Vg:~/catkin_ws$ rostopic pub servo sensor_msgs/JointState '{header: {seq:0, stamp: {secs:0, nsecs:0}, frame_id:""}, name:["art1"],position:[150.0], velocity:[0.0], effort:[0.0]}' --once

Usage: rostopic pub /topic type [args...]

rostopic: error: Argument error: while scanning a plain scalar

  in "<string>", line 1, column 11:

    {header: {seq:0, stamp: {secs:0, nsecs:0}, ... 
              ^

found unexpected ':'

  in "<string>", line 1, column 14:

    {header: {seq:0, stamp: {secs:0, nsecs:0}, fr ... 
                 ^

Please check http://pyyaml.org/wiki/YAMLColonInFlowContext for details.