run a ros node problem
Hello
I have installed and compiled correctly the ros package amcl_listener. When I tried to run the node amcl_pose_listener it happened nothing. But if I type the command rosnode list I can see the amcl_pose_listener and rosout. Please can you explain me whats going on? My opinion it should do something like simple receipt of messages over the ROS system. But how to prove that?
for the command rostopic list -v
I got this :
Published topics:
* /robot_fixed_pose_trajectory [visualization_msgs/Marker] 1 publisher
* /rosout [rosgraph_msgs/Log] 1 publisher
* /rosout_agg [rosgraph_msgs/Log] 1 publisher
Subscribed topics:
* /amcl_pose [geometry_msgs/PoseWithCovarianceStamped] 1 subscriber
* /rosout [rosgraph_msgs/Log] 1 subscriber
Now is ok. Just the rosrun was killed. So omn the command rosnode info amcl_pose_listener got this
Publications:
* /robot_fixed_pose_trajectory [visualization_msgs/Marker]
* /rosout [rosgraph_msgs/Log]
Subscriptions:
* /amcl_pose [unknown type]
Services:
* /amcl_pose_listener/set_logger_level
* /amcl_pose_listener/get_loggers
contacting node http://bojan-laptop:60358/ ...
Pid: 9274
Connections:
* topic: /rosout
* to: /rosout
* direction: outbound
* transport: TCPROS
Not sure what you mean with 'it happened nothing' but I guess the node is running. If you run the node and don't get a shell prompt, the node is running. What output would you expect? **Edit**: Nobody is publishing amcl_pose. Did you start amcl?
If you don't get an error message when you execute
rosnode info <node name>then the node is running. If you don't get any data, something is probably mis-configured. Unfortunately you are not providing enough information to help in that case.what more information is needed?
rostopic list -vwould be a good start.But I can not see any output. Should give the robot fixed position but no outcome. So how to see this?Because there are two publications: Publications: * /robot_fixed_pose_trajectory [visualization_msgs/Marker] * /rosout [rosgraph_msgs/Log]
amcl is a node that localizes your robot based on a laser scan and odometry using a particle filter. See http://ros.org/wiki/amcl It publishes amcl_pose which your node apparently needs. That means that you probably need to run it.