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| ROS Service 사용 OS ubuntu 18.04 ROS Version Melodic Board Raspberry 4 Service File : SrvTutorial.srv int64 a int64 b --- int64 result server.cpp #include"ros/ros.h" #include"ros_service_demo/SrvTutorial.h" bool calculation(ros_service_demo::SrvTutorial::Request &req, ros_service_demo::SrvTutorial::Response &res){ res.result=req.a+req.b; ROS_INFO("request : x=%ld, y=%ld",(long int)req.a,(long in..