Hello, I am making a **simple subscriber which will subscribe to /lms200** topic on which **Laser Data is being published.**
**I went through the ROS tutorial [Writing a Simple Publisher and Subscriber (C++)](http://wiki.ros.org/ROS/Tutorials/WritingPublisherSubscriber%28c%2B%2B%29), and wrote the following subscriber node, it has been complied successfully but neither it generate any output not any error.**
***Here is my sample code:***
#include "ros/ros.h"
#include "std_msgs/String.h"
void chatterCallback(const std_msgs::String::ConstPtr& msg)
{
ROS_INFO("I heard: [%s]", msg->data.c_str());
}
int main(int argc, char **argv)
{
ros::init(argc, argv, "redirector");
ros::NodeHandle n;
ros::Subscriber sub = n.subscribe("lms200", 1000, chatterCallback);
ros::spin();
return 0;
}
following is the output when i executes the **$rospotic echo /lms200**
header:
seq: 296
stamp:
secs: 1417864716
nsecs: 451817364
frame_id: lms200
angle_min: -1.5707000494
angle_max: 1.5707000494
angle_increment: 0.0174000002444
time_increment: 0.0
scan_time: 0.0
range_min: 0.10000000149
range_max: 20.0
ranges: [9.380000114440918, 9.380000114440918, 9.380000114440918, 9.390000343322754, 9.390000343322754, 9.399999618530273, 9.420000076293945, 9.430000305175781, 9.449999809265137, 9.470000267028809, 9.5, 9.529999732971191, 9.5600004196167, 9.59000015258789, 9.630000114440918, 9.670000076293945, 1.7699999809265137, 1.7699999809265137]
intensities: []
**and following is the output when i executes the following command:-**
cr-lab-tu@crlabtu-HP-Z800-Workstation:~$ rostopic info /lms200
Type: sensor_msgs/LaserScan
Publishers:
* /RosSim (http://crlabtu-HP-Z800-Workstation:55152/)
Subscribers:
* /redirector (http://crlabtu-HP-Z800-Workstation:40278/)
cr-lab-tu@crlabtu-HP-Z800-Workstation:~$
**Please help me out to solve the problem.**
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