Revision history [back]

As the error tells, your message types are inconsistent. Try the correct message type which is sensor_msgs::LaserScan instead of std_msgs::String.

void laser_msg_Callback(const sensor_msgs::LaserScan::ConstPtr& scan)
{
  //you can get readings with scan->ranges[]
}

As the error tells, your message types are inconsistent. Try the correct message type which is sensor_msgs::LaserScan instead of std_msgs::String.

void laser_msg_Callback(const sensor_msgs::LaserScan::ConstPtr& scan)
{
  //you can get readings with scan->ranges[]
}