Data Distribution Service (DDS): Decentralized Pub/Sub with Rich QoS Policies

Leveraging DDS durability, reliability, and deadline QoS parameters to build high-performance sensor-to-actuator pipelines without single points of failure.

Critical QoS Parameters: Reliability, Durability, and Deadline

Setting `Reliability.kind = RELIABLE` enforces heartbeats and NACK acknowledgments for brake commands, while `BEST_EFFORT` avoids retransmission delays for 60Hz camera streams. `Deadline.period = 20ms` triggers a hardware alarm callback if a radar publisher fails to produce fresh point clouds within the specified window, allowing immediate fail-safe engagement.

ROS 2 Integration: Bridging Robotics Research into Automotive Production

The open-source robotics framework ROS 2 runs directly on top of DDS (via ROS Middleware, RMW implementations). Autonomous driving teams prototype navigation and perception algorithms in ROS 2, and seamlessly deploy those exact C++ nodes into ISO 26262 certified DDS middleware in production without rewriting data structures.

Brokerless peer-to-peer discovery eliminating single points of failure in autonomous vehicles.
Contractual QoS matching ensuring publishers and subscribers meet mutual reliability and latency deadlines.
Transient local durability caching historical states for late-joining safety monitors.
Hardware network interface multicast offload distributing sensor feeds to multiple neural networks simultaneously.

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