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Error using urROS2Node

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Jose il 10 Apr 2024
Commentato: Jose il 17 Apr 2024
I am using MATLAB 2024a in linux, where I have installed ROS 2 and Dependencies as proposed in here by using the automated method.
As can be seen in the picture, evrething seems to work fine.
However, I am trying to connect to the UR simulator, as explained in this example using this script:
clear, clc;
ur5e = loadrobot('universalUR5e');
username = 'xxxxxx';
password = 'xxxxxxx';
ROS2Folder = '/opt/ros/humble';
ROS2Workspace = '/opt/ros/humble'; % In case of binary installation, ROS 2 Work-space is same as ROS 2 Folder
ROS2DeviceAddress = '';
robotAddress = '';
device = ros2device(ROS2DeviceAddress,username,password);
device.ROS2Folder = ROS2Folder;
device.ROS2Workspace = ROS2Workspace;
ur = urROS2Node('RigidBodyTree',ur5e);
and modifying the associated function so it works on simulation:
function generateAndTransferLaunchScriptROS2GettingStarted(device,WorkSpaceFolder,RobotAddress)
% Open a file to write set of commands to launch simulated UR5e
% in URSim
% launch depending on the installation of ros2 ur driver
if strcmp(WorkSpaceFolder, device.ROS2Folder)
% Launch command for binary installation
fprintf(fid,"gnome-terminal --title=\42Simulated UR5e Robot\42 -- /bin/bash -c 'source %s/setup.bash; ros2 launch ur_robot_driver launch_rviz:=false robot_ip:=%s'",device.ROS2Folder,RobotAddress);
% Launch command for source installation
fprintf(fid,"gnome-terminal --title=\42Simulated UR5e Robot\42 -- /bin/bash -c 'source %s/setup.bash; source %s/install/setup.bash; ros2 launch ur_robot_driver launch_rviz:=false robot_ip:=%s'",device.ROS2Folder,WorkSpaceFolder,RobotAddress);
% Copy file into ROS2 device
% Make the shell script executable
system(device,'chmod a+x ~/');
% Launch the script
% system(device,'./ &');
system(device,'./ &'); % JL: I use this instead
The UR sim loger viewer indicates that the communication is reached.
However, I am getting this error:
Error using ros.internal.getEmptyMessage>getMessageDataAndInfo (line 70)
How could I solve it so I can continue with the example execution?
Screenshot of the Matlab and urSim windows:
  4 Commenti
Jishnu Subramonian
Jishnu Subramonian il 17 Apr 2024
Modificato: Jishnu Subramonian il 17 Apr 2024
Hello Jose,
It appears to me the necessary ur_dashboard_msgs for service creation is unavailable. We set this up while performing the Hardware setup screens, in case this was not performed earlier could you complete it by following steps below:
  1. Go to the Home tab.
  2. Select Add-Ons > Manage Add-Ons.
  3. Locate the Robotics System Toolbox Support Package for Universal Robots UR Series Manipulator and select the gear icon adjacent to it.
  4. This opens the Setup screen, choose ROS2 and follow the instructions to complete the setup.
After completing the setup, try creating the urROS2Node again, if the issue persist pl. let us know.
Jose il 17 Apr 2024
Hi Jishnu,
thank you very much for your response. I followed the suggested steps, but unfortunatly I still cannot create the urnode. This is the new error:
Error using urROS2Node (line 202)
ROS 2 action server "/scaled_joint_trajectory_controller/follow_joint_trajectory" is currently unavailable. Relaunch the ROS2 driver node and create urROS2Node.
However, I managed to control a real UR10e robot. So, my issue is clearly with the URsim, and I will work directly with the real robot.
Thanks for the support.

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