initial

CMakeLists.txt

+cmake_minimum_required(VERSION 3.5)
+
+project(elphel-interfaces)
+
+# Default to C++14
+if(NOT CMAKE_CXX_STANDARD)
+  set(CMAKE_CXX_STANDARD 14)
+endif()
+if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+  # we dont use add_compile_options with pedantic in message packages
+  # because the Python C extensions dont comply with it
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wpedantic")
+endif()
+
+find_package(ament_cmake REQUIRED)
+find_package(rosidl_default_generators REQUIRED)
+
+rosidl_generate_interfaces(${PROJECT_NAME}
+  "srv/Strings.srv"
+)
+
+#install(FILES mapping_rules.yaml DESTINATION share/${PROJECT_NAME})
+
+ament_package()

package.xml

+<?xml version="1.0"?>
+<?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
+<package format="3">
+  <name>elphel_interfaces</name>
+  <version>1.0.0</version>
+  <description>Contains message and service definitions.</description>
+  <maintainer email="oleg@elphel.com">Oleg Dzhimiev</maintainer>
+  <license>GPL-3.0-or-later</license>
+  <buildtool_depend>ament_cmake</buildtool_depend>
+  <buildtool_depend>rosidl_default_generators</buildtool_depend>
+  <exec_depend>rosidl_default_runtime</exec_depend>
+  <member_of_group>rosidl_interface_packages</member_of_group>
+  <export>
+    <build_type>ament_cmake</build_type>
+  </export>
+</package>

srv/Strings.srv

+string request
+---
+string response