surfertas's profile - activity

I am using ROS2 version dashing on Ubuntu 18.04.3 LTS.

I am failing to build the ros2 demos found at:

https://github.com/ros2/demos/tree/ma...

Steps to reproduce:

$ mkdir -p ros2_demos_ws/src
$ cd ros2_demos_ws/src
$ git clone https://github.com/ros2/demos

I place COLCON_IGNORE in all the folders that I want colcon to ignore (basically all the demos except the "composition" demo).

$ cd ros2_demos_ws
$ colcon build --symlink-install

Which results in the following output.

[0.192s] WARNING:colcon.colcon_ros.prefix_path.catkin:The path 
'home/ros2_example_ws/install/examples_rclcpp_minimal_action_client' in the environment variable 
CMAKE_PREFIX_PATH doesn't exist
--- stderr: composition                         
CMake Error at CMakeLists.txt:133 (find_package):
By not providing "Findlaunch_testing_ament_cmake.cmake" in
CMAKE_MODULE_PATH this project has asked CMake to find a package
configuration file provided by "launch_testing_ament_cmake", but CMake did
not find one.

Could not find a package configuration file provided by
"launch_testing_ament_cmake" with any of the following names:

   launch_testing_ament_cmakeConfig.cmake
   launch_testing_ament_cmake-config.cmake

 Add the installation prefix of "launch_testing_ament_cmake" to
 CMAKE_PREFIX_PATH or set "launch_testing_ament_cmake_DIR" to a directory
 containing one of the above files.  If "launch_testing_ament_cmake"
 provides a separate development package or SDK, be sure it has been
 installed.

This isnt specific to ROS but: Did you enable SSH via raspi-config? Have you looked in wpa_supplicant.conf files?

This isnt specific to ROS but; 1. Did you enable SSH via raspi-config? 2. Have you looked in wpa_supplicant.conf files?

No problem. Please mark the answers as correct in that case.

Sorry, I should have been more complete in my answer. Out of curiosity, why do you want to use the boost library when th

Assuming that you have split declarations into a header file and definitions in the source file. You can declare the br

What is the quality of service, QoS, setting of the publisher?

What is the quality of service, QoS, the setting of the publisher?

Was this resolved?

Can you include the warnings, errors outputted to the terminal?

You can use std::placeholders::_1. Reference: https://en.cppreference.com/w/cpp/utility/functional/placeholders. This

You can use std::placeholders::_1. Reference: https://en.cppreference.com/w/cpp/utility/functional/placeholders. This

You can use std::placeholders::_1. Reference: https://en.cppreference.com/w/cpp/utility/functional/placeholders. In pl

Assuming that you have split declarations into a header file and definitions in the source file. You can declare the br

Assuming that you have split declarations into a header file and definitions in the source file. You can declare the br

Assuming that you have split declarations into a header file and definitions in the source file. You can declare the br

Might be good practice to split declarations into header file and definitions in the source file. Then you can declare

Might be good practice to split declarations into header file and definitions in the source file. Then you can declare

Might be good practice to split declarations into header file and definitions in the source file. Then you can declare

Might be good practice to split declarations into header file and definitions in the source file. Then you can declare

Might be good practice to split declarations into header file and definitions in the source file. Then you can declare

Might be good practice to split declarations into header file and definitions in the source file. Then you can declare

Might be good practice to split declarations into header file and definitions in the source file. Then you can declare

First, check if the signature of the callback is correct. (e.g. void callback(const std::shared_ptr<M const>&,

I will leave this stack overflow discussion on differences for reference.

The callback needs to be of signature void callback(const std::shared_ptr<M const>&) as detailed here Change

Also as @KenYN has mentioned, my signature is consistent with his suggestion. Did you try that as well?

Ok assuming everything compiles, seems like there might be QoS compatibility issue. Its recommended to use rmw_qos_profi

Ok assuming everything compiles, seems like there might be QoS compatibility issue. Its recommended to use rmw_qos_profi

Ok assuming everything compiles, seems like there might be QoS compatibility issue. Its recommended to use rmw_qos_profi

Ok assuming everything compiles, seems like there might be QoS compatibility issue. Its recommended to use rmw_qos_profi

I suggest working through: Robotis e-manual on the Turtlebot 3. ROS Navigation 2 tutorials Questions you pose should

I recommend working through: Robotis e-manual on the Turtlebot 3. ROS Navigation 2 tutorials

Check if the Quality of Service (QoS) is compatible between the subscriber and publisher. You can specify a QoS by pass

Also try using ros2 topic info <TOPIC> for each topic, and confirm that you observe expected values for Publisher

I am assuming that the headers for each image message has been populated correctly. Try outputting the stamps msg->he

I am assuming that the headers for each image message has been populated correctly. Try outputting the stamps msg->he

Instead of list initialization for construction, initialize through the constructor by calling subscribe(). image_su

Do you need to use the initializer list for construction? Can you try to initialize through the constructor as below? N