listener.cpp

#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, "listener");
ros::NodeHandle n;
ros::Subscriber sub = n.subscribe("chatter", 1000, chatterCallback);
ros::spin();
return 0;
}