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2015-12-10 02:02:29 -0500 asked a question Get data from sensor to control a robot


I'm totally new to Gazebo and I'm currently trying to exploit the data from the laser sensor I put on a robot. I noticed this post :, so I tried to read the laser data from the corresponding topic which is "/gazebo/default/roc_robot/hokuyo/link/laser/scan" in my case.

This is my model plugin (used by the robot model) :

namespace gazebo
  class RocPlugin : public ModelPlugin
    physics::ModelPtr           model;
    transport::SubscriberPtr    sptr;

    void Load(physics::ModelPtr _parent, sdf::ElementPtr /*_sdf*/)
      std::string             topicName = "/gazebo/default/roc_robot/hokuyo/link/laser/scan";
      transport::NodePtr      node(new transport::Node());

      model = _parent;
      node = node->Subscribe(topicName, &RocPlugin::ReadLaserData, this);

   void ReadLaserData(ConstRaySensorPtr &_msg)
      std::cout << _msg->range_max() << std::endl;


And I got this error :

gzserver: /usr/include/boost/smart_ptr/shared_ptr.hpp:687: typename boost::detail::sp_member_access<t>::type boost::shared_ptr<t>::operator->() const [with T = const gazebo::msgs::RaySensor; typename boost::detail::sp_member_access<t>::type = const gazebo::msgs::RaySensor*]: Assertion `px != 0' failed.

Since I aim to move the robot according to the data produced by the laser I haven't tried to write a plugin for the laser because even if I manage to read data from a sensor plugin I need those in my model plugin to control my robot.

Can you give me a tip for doing it ? ( Thank you ! )