(, check for CATKIN_ENABLE_TESTING to enable configure without tests, generate pkg config extra files containing variables which list all ) Do you know why the generate_messages_cpp target is not run before building the dependent package? That example assumes std_msgs is the only dependency. var bg = $(this).attr("value").split(":"); They are used to generate source code for messages in different languages. I am currently doing the ROS tutorial on Writing a Simple Publisher and Subscriber (C++). (, fix installation of __init__.py from devel space (, fix service files variable to only contain package relative paths (, pass all message generation target to EXPORTED_TARGETS Please start posting anonymously - your entry will be published after you log in or create a new account. // --> function Buildsystem(sections) { The Python script will be created in ~/catkin_ws/devel/lib/python2.7/dist-packages/beginner_tutorials/msg. To keep things organized with ROS it's better to create one package solely dedicated to Messages, Services, and Actions. Now we can copy a service from the rospy_tutorials package: There's one more step, though. To generate actions, add actionlib_msgs as a dependency: My experience with ROS is quite shallow so I probably am wrong, but have you added generate_messages in your CMakeLists.txt in the correct format? The <depend> tag is recommended for message dependencies. ( Uncomment it by removing the # symbols and then replace the stand in Message*.msg files with your .msg file, such that it looks like this: By adding the .msg files manually, we make sure that CMake knows when it has to reconfigure the project after you add other .msg files. We need to make sure that the msg files are turned into source code for C++, Python, and other languages. Simply place a .msg file inside the msg directory in a package. Define dependencies. if (url_distro) var dotversion = ".buildsystem." Check out the ROS 2 Documentation,