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qboticslabs / mastering_ros

This repository contains exercise files of the book "Mastering ROS for Robotics Programming"
https://www.packtpub.com/hardware-and-creative/mastering-ros-robotics-programming
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Chapter 3 codes: tf does not exist #35

Open suvrat13 opened 6 years ago

suvrat13 commented 6 years ago

When I'm trying to visualize the robot state and laser data on Rviz, I get an error in RViz that Fixed frame [map] does not exist. When i run rosrun rqt rqt i see tf being published. I dont know what to do.

qboticslabs commented 6 years ago

Can you post the issue with a screenshot ?

suvrat13 commented 6 years ago

screenshot from 2018-04-18 09 58 33

suvrat13 commented 6 years ago

Here you can see that the arm does not load with RViz. I observed the same issue with the diff robot. Additionally I encountered the following error when launching seven_dof_arm_bringup_moveit.launch file

[libprotobuf ERROR google/protobuf/message_lite.cc:123] Can't parse message of type "gazebo.msgs.Packet" because it is missing required fields: stamp, type, serialized_data Master Unknown message type[] From[37752]

I cant find a fix for these problems.

qboticslabs commented 6 years ago

Hi

Can you try to launch the following command for Rviz?

roslaunch seven_dof_arm_config demo.launch

suvrat13 commented 6 years ago

Well the robot does load with launching with roslaunch seven_dof_arm_config demo.launch. It is when launching through moveit with gazebo that I face this issue.

qboticslabs commented 6 years ago

It seems like a bug in Gazebo. May I know the version of ROS you are using and Ubuntu version?

Also, are you trying it on real PC or virtual box?

suvrat13 commented 6 years ago

I am using ROS-indigo on Ubuntu Trusty 14.04 LTS. I have ubuntu installed in my PC. Its not running on virtual box.

qboticslabs commented 6 years ago

Did you check whether it is happening for other simulations? We have to find whether this bug is only for this demo.

suvrat13 commented 6 years ago

I tried simulating the diff_drive_robot to observe the laser scan in RViz. I had the same problem there. I see that when I try to launch other projects ( different robotic arm) it works fine with demo.launch. Is this what you are asking?