ROS Basics in 5 days (C++) 4.4 Topics Quiz Not subscribed to

I don’t understand what I am doing wrong. The robot avoids an obstacle. The node name is correct (“topics_quiz_node”). No other programs are running. #include <ros/ros.h> #include <geometry_msgs/Twist.h> #include <sensor_msgs/LaserScan.h> float angVel = 0; void laserCallback(const sensor_msgs::LaserScan::ConstPtr& laserScan) { angVel = 0.0; ROS_INFO("Forward: %f", laserScan->ranges[360]); ROS_INFO("Left: %f", laserScan->ranges[719]); ROS_INFO("Right: %f", laserScan->ranges[719]);

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