ros2/ros2
Ros2
ROS 2 is a distributed communication middleware for robot systems, built on a peer-to-peer Data Distribution Service (DDS) foundation. It provides a publish-subscribe messaging layer where typed data flows between decoupled components across a network, along with synchronous remote procedure calls and action-based task execution for long-running goals with periodic feedback. The framework includes an interface definition language that generates type-safe code for messages, services, and actions, ensuring cross-language compatibility, and supports fine-grained Quality of Service profiles that control reliability, durability, and delivery guarantees per data stream.
DDS-based decentralized design enables automatic discovery of nodes, topics, and services across a network without a central broker, while a lifecycle state machine manages runtime states from unconfigured through active and finalized for deterministic startup and shutdown. The action server-client protocol handles goal acceptance, cancellation, and result retrieval, and launch file configuration in XML, YAML, or JSON orchestrates multi-node systems with parameter setting and topic remapping. These capabilities distinguish ROS 2 as a self-contained middleware that handles both low-level data transport and high-level coordination patterns.
Beyond core communication, ROS 2 offers command-line tools for system inspection and management, a parameter server for runtime configuration, and facilities for launching and supervising groups of interconnected processes. Data recording and replay captures published messages to files for analysis, and graphical diagnostic tools provide visual monitoring of system state and logs. Shell environment setup makes tools and packages accessible, completing the deployment surface.
Features
- Distributed Robot Middleware - Connects independent robot software components as a graph for typed message exchange across a network.
- Network Service Discovery - Automatically discovers active components and their advertised interfaces on a network without manual configuration.
- Goal-Based - Executes goal-based tasks with periodic progress feedback and preemption or cancellation support.
- Service and Topic Discovery - Automatically discovers nodes, topics, and services across a network without a central broker.
- Typed Pub-Sub Communication - Integrates decoupled processes that exchange typed data and call services asynchronously via pub-sub.
- Topic and Service Schemas - Specifies typed interfaces for topics and services with structured schemas enforcing consistency and versioning.
- Decentralized - Implements a decentralized peer-to-peer publish-subscribe messaging layer with automatic discovery and QoS.
- Typed Topic Pub-Sub - Sends and receives typed messages between decoupled components through anonymous publish-subscribe channels.
- Remote Procedure Calls - Provides synchronous remote procedure calls for requesting computations from other components and waiting for replies.
- Long-Running Task Protocols - Provides a client-server protocol for long-running robot tasks with periodic feedback and cancellation.
- Type-Safe Code Generators - Generates type-safe code for messages, services, and actions from abstract definition files.
- Topic-Based Node Graphs - Enables independent processes to publish and subscribe to messages over named channels in a node graph.
- Multi-Process Launch Configurations - Ships a launch file system for declaring multi-node robot systems with parameters and topic remapping.
- Node Runtime State Machines - Manages node runtime states with explicit transitions for deterministic startup and shutdown.
- Distributed Parameter Servers - Ships a parameter server for distributed components to set and retrieve configuration values at runtime.
- Distributed Node Lifecycles - Launches, configures, and supervises groups of interconnected nodes from a single configuration file.
- Data Stream - Defines fine-grained quality-of-service profiles for reliability, durability, and delivery guarantees per data stream.
- Distributed System CLIs - Provides a command-line interface for managing distributed system components, channels, and settings.
- Data Stream Recording and Replay - Captures published messages to files and replays them to reproduce and analyze previous system behavior.
- Robotics Data Recording - Captures published messages to files and replays them to reproduce and analyze previous system behavior.
- Distributed System Inspectors - Ships command-line tools for inspecting running nodes, topics, services, and parameters across a distributed system.
- Multi-Node - Launches and supervises multiple interconnected processes from a configuration file with lifecycle monitoring.
- Robot Frameworks - Core software stack for the Robot Operating System.
- Documentation and Guides - Core documentation and examples for understanding system concepts.
