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erickkrameralex-mitrevski
erickkramer
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alex-mitrevski
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Files for the services tutorial added
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‎exercises/ros/services/CATKIN_IGNORE

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‎exercises/ros/services/CMakeLists.txt

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cmake_minimum_required(VERSION 2.8.3)
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project(service_demo)
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## Compile as C++11, supported in ROS Kinetic and newer
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# add_compile_options(-std=c++11)
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## Find catkin macros and libraries
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## if COMPONENTS list like find_package(catkin REQUIRED COMPONENTS xyz)
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## is used, also find other catkin packages
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find_package(catkin REQUIRED COMPONENTS
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rospy
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std_msgs
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)
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## System dependencies are found with CMake's conventions
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# find_package(Boost REQUIRED COMPONENTS system)
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## Uncomment this if the package has a setup.py. This macro ensures
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## modules and global scripts declared therein get installed
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## See http://ros.org/doc/api/catkin/html/user_guide/setup_dot_py.html
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# catkin_python_setup()
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################################################
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## Declare ROS messages, services and actions ##
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################################################
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## To declare and build messages, services or actions from within this
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## package, follow these steps:
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## * Let MSG_DEP_SET be the set of packages whose message types you use in
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## your messages/services/actions (e.g. std_msgs, actionlib_msgs, ...).
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## * In the file package.xml:
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## * add a build_depend tag for "message_generation"
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## * add a build_depend and a run_depend tag for each package in MSG_DEP_SET
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## * If MSG_DEP_SET isn't empty the following dependency has been pulled in
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## but can be declared for certainty nonetheless:
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## * add a run_depend tag for "message_runtime"
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## * In this file (CMakeLists.txt):
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## * add "message_generation" and every package in MSG_DEP_SET to
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## find_package(catkin REQUIRED COMPONENTS ...)
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## * add "message_runtime" and every package in MSG_DEP_SET to
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## catkin_package(CATKIN_DEPENDS ...)
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## * uncomment the add_*_files sections below as needed
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## and list every .msg/.srv/.action file to be processed
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## * uncomment the generate_messages entry below
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## * add every package in MSG_DEP_SET to generate_messages(DEPENDENCIES ...)
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## Generate messages in the 'msg' folder
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# add_message_files(
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# FILES
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# Message1.msg
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# Message2.msg
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# )
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## Generate services in the 'srv' folder
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# add_service_files(
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# FILES
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# Service1.srv
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# Service2.srv
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# )
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## Generate actions in the 'action' folder
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# add_action_files(
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# FILES
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# Action1.action
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# Action2.action
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# )
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## Generate added messages and services with any dependencies listed here
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# generate_messages(
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# DEPENDENCIES
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# std_msgs
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# )
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################################################
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## Declare ROS dynamic reconfigure parameters ##
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################################################
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## To declare and build dynamic reconfigure parameters within this
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## package, follow these steps:
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## * In the file package.xml:
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## * add a build_depend and a run_depend tag for "dynamic_reconfigure"
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## * In this file (CMakeLists.txt):
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## * add "dynamic_reconfigure" to
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## find_package(catkin REQUIRED COMPONENTS ...)
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## * uncomment the "generate_dynamic_reconfigure_options" section below
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## and list every .cfg file to be processed
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## Generate dynamic reconfigure parameters in the 'cfg' folder
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# generate_dynamic_reconfigure_options(
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# cfg/DynReconf1.cfg
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# cfg/DynReconf2.cfg
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# )
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###################################
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## catkin specific configuration ##
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###################################
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## The catkin_package macro generates cmake config files for your package
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## Declare things to be passed to dependent projects
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## INCLUDE_DIRS: uncomment this if your package contains header files
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## LIBRARIES: libraries you create in this project that dependent projects also need
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## CATKIN_DEPENDS: catkin_packages dependent projects also need
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## DEPENDS: system dependencies of this project that dependent projects also need
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catkin_package(
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# INCLUDE_DIRS include
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# LIBRARIES service_demo
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# CATKIN_DEPENDS rospy std_msgs
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# DEPENDS system_lib
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)
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###########
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## Build ##
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###########
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## Specify additional locations of header files
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## Your package locations should be listed before other locations
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include_directories(
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# include
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${catkin_INCLUDE_DIRS}
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)
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## Declare a C++ library
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# add_library(${PROJECT_NAME}
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# src/${PROJECT_NAME}/service_demo.cpp
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# )
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## Add cmake target dependencies of the library
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## as an example, code may need to be generated before libraries
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## either from message generation or dynamic reconfigure
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# add_dependencies(${PROJECT_NAME} ${${PROJECT_NAME}_EXPORTED_TARGETS} ${catkin_EXPORTED_TARGETS})
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## Declare a C++ executable
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## With catkin_make all packages are built within a single CMake context
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## The recommended prefix ensures that target names across packages don't collide
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# add_executable(${PROJECT_NAME}_node src/service_demo_node.cpp)
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## Rename C++ executable without prefix
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## The above recommended prefix causes long target names, the following renames the
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## target back to the shorter version for ease of user use
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## e.g. "rosrun someones_pkg node" instead of "rosrun someones_pkg someones_pkg_node"
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# set_target_properties(${PROJECT_NAME}_node PROPERTIES OUTPUT_NAME node PREFIX "")
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## Add cmake target dependencies of the executable
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## same as for the library above
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# add_dependencies(${PROJECT_NAME}_node ${${PROJECT_NAME}_EXPORTED_TARGETS} ${catkin_EXPORTED_TARGETS})
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## Specify libraries to link a library or executable target against
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# target_link_libraries(${PROJECT_NAME}_node
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# ${catkin_LIBRARIES}
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# )
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#############
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## Install ##
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#############
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# all install targets should use catkin DESTINATION variables
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# See http://ros.org/doc/api/catkin/html/adv_user_guide/variables.html
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## Mark executable scripts (Python etc.) for installation
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## in contrast to setup.py, you can choose the destination
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# install(PROGRAMS
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# scripts/my_python_script
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# DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}
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# )
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## Mark executables and/or libraries for installation
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# install(TARGETS ${PROJECT_NAME} ${PROJECT_NAME}_node
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# ARCHIVE DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
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# LIBRARY DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
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# RUNTIME DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}
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# )
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## Mark cpp header files for installation
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# install(DIRECTORY include/${PROJECT_NAME}/
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# DESTINATION ${CATKIN_PACKAGE_INCLUDE_DESTINATION}
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# FILES_MATCHING PATTERN "*.h"
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# PATTERN ".svn" EXCLUDE
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# )
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## Mark other files for installation (e.g. launch and bag files, etc.)
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# install(FILES
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# # myfile1
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# # myfile2
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# DESTINATION ${CATKIN_PACKAGE_SHARE_DESTINATION}
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# )
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#############
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## Testing ##
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#############
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## Add gtest based cpp test target and link libraries
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# catkin_add_gtest(${PROJECT_NAME}-test test/test_service_demo.cpp)
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# if(TARGET ${PROJECT_NAME}-test)
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# target_link_libraries(${PROJECT_NAME}-test ${PROJECT_NAME})
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# endif()
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## Add folders to be run by python nosetests
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# catkin_add_nosetests(test)

‎exercises/ros/services/README.md

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# Foundation Course: Service / Client
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This is an introduction practice for service and client
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## Instructions:
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1. Create ros_package
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```
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$ catkin_create_pkg beginner_tutorials std_msgs rospy
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```
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2. Create srv file
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```
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Structure of the service file
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Request
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messagetype message
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---
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Request
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messagetype message
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```
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3. Complete the nodes inside src/
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```
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Do not forget to make the nodes executable
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$ chmod +x server_demo.py
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$ chmod +x client_demo.py
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```
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4. Modify CMakeLists.txt file
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```
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Follow the person explaining the process to modify the file properly
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```
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5. Build the workspace
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```
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$ catkin build
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Alternatively
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$ catkin_make
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```

‎exercises/ros/services/package.xml

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<?xml version="1.0"?>
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<package format="2">
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<name>service_demo</name>
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<version>0.0.0</version>
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<description>The service_demo package</description>
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<!-- One maintainer tag required, multiple allowed, one person per tag -->
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<!-- Example: -->
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<!-- <maintainer email="[email protected]">Jane Doe</maintainer> -->
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<maintainer email="[email protected]">kramer</maintainer>
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<!-- One license tag required, multiple allowed, one license per tag -->
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<!-- Commonly used license strings: -->
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<!-- BSD, MIT, Boost Software License, GPLv2, GPLv3, LGPLv2.1, LGPLv3 -->
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<license>TODO</license>
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<!-- Url tags are optional, but multiple are allowed, one per tag -->
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<!-- Optional attribute type can be: website, bugtracker, or repository -->
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<!-- Example: -->
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<!-- <url type="website">http://wiki.ros.org/service_demo</url> -->
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<!-- Author tags are optional, multiple are allowed, one per tag -->
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<!-- Authors do not have to be maintainers, but could be -->
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<!-- Example: -->
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<!-- <author email="[email protected]">Jane Doe</author> -->
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<!-- The *depend tags are used to specify dependencies -->
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<!-- Dependencies can be catkin packages or system dependencies -->
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<!-- Examples: -->
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<!-- Use depend as a shortcut for packages that are both build and exec dependencies -->
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<!-- <depend>roscpp</depend> -->
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<!-- Note that this is equivalent to the following: -->
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<!-- <build_depend>roscpp</build_depend> -->
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<!-- <exec_depend>roscpp</exec_depend> -->
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<!-- Use build_depend for packages you need at compile time: -->
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<!-- <build_depend>message_generation</build_depend> -->
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<!-- Use build_export_depend for packages you need in order to build against this package: -->
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<!-- <build_export_depend>message_generation</build_export_depend> -->
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<!-- Use buildtool_depend for build tool packages: -->
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<!-- <buildtool_depend>catkin</buildtool_depend> -->
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<!-- Use exec_depend for packages you need at runtime: -->
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<!-- <exec_depend>message_runtime</exec_depend> -->
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<!-- Use test_depend for packages you need only for testing: -->
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<!-- <test_depend>gtest</test_depend> -->
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<!-- Use doc_depend for packages you need only for building documentation: -->
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<!-- <doc_depend>doxygen</doc_depend> -->
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<buildtool_depend>catkin</buildtool_depend>
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<build_depend>rospy</build_depend>
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<build_depend>std_msgs</build_depend>
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<build_export_depend>rospy</build_export_depend>
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<build_export_depend>std_msgs</build_export_depend>
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<exec_depend>rospy</exec_depend>
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<exec_depend>std_msgs</exec_depend>
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<!-- The export tag contains other, unspecified, tags -->
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<export>
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<!-- Other tools can request additional information be placed here -->
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</export>
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</package>

‎exercises/ros/services/src/client_demo.py

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#!/usr/bin/env python
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from service_demo.srv import two_ints
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import rospy
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class client:
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def __init__(self):
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#Initialize the client node
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rospy.init_node("client_demo")
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#Show in the console the message
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rospy.loginfo("Client initiated")
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#Pause the node untill the service specified(service_label) is active
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rospy.wait_for_service("add_two_ints")
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"""
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Create client
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structure of the client ->
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name_of_client = rospy.ServiceProxy("service_label", service_name)
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"""
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if __name__=='__main__':
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n = client()
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while not rospy.is_shutdown():
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"""
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Request two number from the terminal
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To assure that you get only numbers, use the try except structure
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try:
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a =
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except ValueError:
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rospy.logerr("Invalid input")
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a =
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try:
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b =
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except ValueError:
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rospy.logerr("Invalid input")
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b =
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Collect the value from the client service
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result = n.name_of_client(parameter_1, parameter_2)
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HINT: To collect specifically the value write:
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result.sum
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Tasks:
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1. Display the result of the sum, the multiplication, the substraction,
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and division
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"""
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rospy.spin()

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