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As pointed out in tutorial CreatingMsgAndSrv for message/service generation with catkin you need to:

• Add to package.xml:

  <build_depend>message_generation</build_depend>
<run_depend>message_runtime</run_depend>

• Add message_generation in CMakeLists.txt as REQUIRED catkin component (like any package, e. g. roscpp):
  

  find_package( catkin REQUIRED COMPONENTS roscpp message_generation )

• uncomment add_message_files in CMakelists.txt and add your msg files with messages to be generated:
  

  add_message_files( FILES my_message.msg )

• uncomment add_service_files in CMakelists.txt and add your srv files with services to be generated:
  

  add_message_files( FILES beginner_tutorials.srv )

• uncomment generate_messages in CMakeLists.txt with packages containing msgs depending on:
  

  generate_messages( DEPENDENCIES std_msgs )

• in CMakeLists.txt add ${PROJECT_NAME}_generate_messages_cpp as dependency of your target that required the message to be generated before being compiled (in C++, I am not sure if is also necessary for python)

  add_executable( foo_exec src/foo.cpp)
target_link_libraries( foo_exec ${catkin_LIBRARIES} )
add_dependencies( foo_exec ${PROJECT_NAME}_generate_messages_cpp )

As pointed out in tutorial CreatingMsgAndSrv for message/service generation with catkin you need to:

• Add to package.xml:

  <build_depend>message_generation</build_depend>
<run_depend>message_runtime</run_depend>

• Add message_generation in CMakeLists.txt as REQUIRED catkin component (like any package, e. g. roscpp):
  

  find_package( catkin REQUIRED COMPONENTS roscpp message_generation )

• uncomment add_message_files in CMakelists.txt and add your msg files with messages to be generated:
  

  add_message_files( FILES my_message.msg )

• uncomment add_service_files in CMakelists.txt and add your srv files with services to be generated:
  

  add_message_files( add_service_files( FILES beginner_tutorials.srv )

• uncomment generate_messages in CMakeLists.txt with packages containing msgs depending on:
  

  generate_messages( DEPENDENCIES std_msgs )

• in CMakeLists.txt add ${PROJECT_NAME}_generate_messages_cpp as dependency of your target that required the message to be generated before being compiled (in C++, I am not sure if is also necessary for python)

  add_executable( foo_exec src/foo.cpp)
target_link_libraries( foo_exec ${catkin_LIBRARIES} )
add_dependencies( foo_exec ${PROJECT_NAME}_generate_messages_cpp )