Introduction to Robotic Technology Components (RTC), Robotics DTF

Introduction to RTC Robotic Technology Component Specification Robotics DTF June 28 2006 Boston, MA, United States Dr. Noriaki Ando [email_address] National Institute of Advanced Science & Technology (AIST) Rick Warren [email_address] Real-Time Innovations (RTI)

Timeline Overview September 2005: RFP issued ptc/2005-09-01 February 2006: Initial submissions National Institute of Advanced Industrial Science and Technology (AIST) mars/2006-01-05 Japan Robot Association (JARA) and Technologic Arts Incorporated join as supporters Real-Time Innovations (RTI) mars/2006-01-06 June 2006: Revised submission Joint submission by AIST and RTI mars/2006-06-11 Seoul National University joins as supporter Adoption until +1 year: Finalization

Timeline of this Meeting Presentation to MARS Monday Some questions and discussion Error/exception handling Basic data types PSM(s) mandatory? XMI now available Vote-to-vote Passed Vote to adopt delayed until Thursday 11:30 am Voters: Please attend or give proxies If passed, go to AB in afternoon

What is RTC? Robotic Technology Component (RTC) Specification Component model for robotics Basis for software modularization and integration at infrastructure/middleware level

Benefits of RTC General benefits of component-orientation LwRTC Execution Semantics Introspection + Power of domain-specific extensions Choice of platforms: CORBA/CCM or Local connectors

Benefits of RTC Execution Semantics package standardizes common design patterns Data flow / periodic, synchronous processing STATE A STATE B Stimulus-response / discrete-event processing Modes of operation

Benefits of RTC Introspection package provides the information you need about… Component A Component B components, ports, and connections which components are working together, and at what rate

Summary: Features of RTC Provides rich component lifecycle to enforce state coherency among components (LwRTC) Defines data structures for describing components and other elements (Introspection) Supports fundamental design patterns Collaboration of fine-grained components tightly coupled in time ( e.g . Simulink) (LwRTC, Local PSM) Local or distributed components (PSMs) Stimulus response with finite state machines (Exec. Sem.) Dynamic composition of components collaborating synchronously or asynchronously (Exec. Sem., Introspection)

Relation to Existing Standards UML Domain-specific profile for UML components Super Distributed Objects (SDO) Introspection of distributed components Ports exposed as SDO services May optionally be combined or implemented with another model e.g. Lightweight CORBA Component Model e.g. Software Radio components

Example: Path Planning Localization component streams coordinates to path planning component Path planning component chooses trajectory generator component dynamically Path planner invokes trajectory generator Data Find Call Localization Path Planning Trajectory Generation

Component Lifecycle (2.2.2.3) Every component has standard lifecycle “ Alive” component can be in 1 of 3 states: Active: switched on Inactive: switch off Error: error handling Each lifecycle transition has callback

Life Cycle Callbacks (2.2.2.5) Callback operations defined by ComponentAction interface Realized by every RT component Called when component… Callback is in error steady state on_error encounters error on_aborting switched off (any # times) on_deactivate switched on (any # times) on_activate destroyed (only once) on_finalize initialized (once) on_initialize

Execution Context (2.2.2.6) Components that work together to accomplish same task participate in same execution context Context corresponds to logical thread Behavioral pattern of participating components determined by context’s execution kind PERIODIC Periodic ordered execution at a given rate EVENT_DRIVEN Asynchronous stimulus response OTHER Ad hoc collaboration or vendor extension

Execution Kinds Localization component runs in PERIODIC context Path planning component runs in EVENT_DRIVEN context Trajectory generator runs in OTHER context * One component per context in this example In general, relationship is many-to-many

Periodic Execution (2.3.1) Localization component needs to execute periodically In every period, it outputs the current location Declare ability to participate in PERIODIC context with dataFlowParticipant stereotype Realize additional callbacks from DataFlowComponentAction interface on_execute invoked periodically Component doesn’t have to manage timing, blocking, looping itself

Order of Operations on_initialize One-time initialization on_activate Prepare for execution on_execute Get and output location on_deactivate Cleanup from execution on_finalize Final destruction

Stimulus Response (2.3.2) Path planning component re-invokes trajectory generator whenever location reaches waypoint Stimulus response provided with UML finite state machines Declare ability to participate in EVENT_DRIVEN context with fsmParticipant stereotype Realize additional callbacks from FsmComponentAction interface on_transition invoked on state transition Component doesn’t have to manage event queuing and dispatch itself

Dynamic Connection (2.4) Path planner dynamically discovers available trajectory generators at runtime Introspection API tells path planner about trajectory generators’ properties and configuration Dynamic port connect()/disconnect() allows path planner to decide when/if to connect to trajectory generator(s)

Getting Involved Evaluate RTC for your application Post to the newsgroup [email_address] If it’s broken, help fix it Give feedback to implementers AIST and RTI are maintaining list of open issues Participate in Finalization Task Force (FTF)

Coming Up Next Vote to adopt MARS meeting Thursday 11:30am Proxies, please Finalization Task Force (FTF) Starts post-adoption Membership not limited to submitters Process described at http://www.omg.org/gettingstarted/process4-Finalize.htm

Introduction to Robotic Technology Components (RTC), Robotics DTF

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