Connext DDS Professional

Connectivity Software for Developing and Integrating IIoT Systems

RTI Connext® DDS Professional is the first connectivity framework designed for the demanding requirements of the Industrial Internet of Things (IIoT). It delivers the low-latency, high reliability, scalability and security essential for mission-critical systems and real-time QoS needed to monitor and control physical-world processes. It provides the non-stop availability and security essential for mission-critical systems. The Connext Databus significantly reduces development, integration and maintenance costs.

Connext DDS includes a rich set of connectivity capabilities optimized for IIoT systems:

  • Messaging libraries simplify distributed application development with high-level APIs for publish-subscribe, request-reply and point-to-point queues
  • An adapter framework with customizable examples eases integration of unmodified existing applications and devices
  • Powerful tools accelerate system integration, testing and debugging.

Two-Minute Topic: Connext DDS Professional

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Connext DDS is designed to address the performance, scalability, security and resilience requirements of the IIoT. Its architecture is completely decentralized. Applications automatically discover each other and communicate peer-to-peer. Unlike traditional IT-centric messaging and integration solutions, Connext DDS does not require any centralized message brokers, services or servers. This makes it easy to embed and deploy while eliminating bottlenecks and single points of failure.

Given the long lifecycles of industrial systems, Connext DDS is well-suited to incremental adoption. It provides a scalable, reliable and secure integration bus that connects new and existing assets. For new applications—such as analytics—it presents a unified API that decouples application logic from device-specific interfaces, protocols and data models. And it allows you to take advantage of fog computing and easily move applications between the cloud and edge.

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Connext DDS Professional includes a powerful set of capabilities to develop and integrate distributed applications.

Features and Benefits of Connext DDS Professional

Data-Centric IIoT Connectivity Software

Connext DDS simplifies application and integration logic with an innovative, powerful data-centric connectivity paradigm. Instead of exchanging messages, software components share data objects. Applications operate directly on these objects (create, read update and delete). Developers do not have to deal with low-level messaging or networking interfaces. Connext DDS handles the details of data distribution and management, including serialization and lifecycle management.

Connext DDS provides for data in motion what a database provides for data at rest:

  • Decoupling – Data producers are agnostic to the number of consumers, their network location and the type of processing they do. This allows components to be added and changed without affecting those that are already deployed.
  • Easy integration – The interfaces in a system—as defined by the data model—are explicit and discoverable. Integration requires no knowledge of a component's implementation and you do not need to reverse engineer protocols and messages.
  • Robustness – Connext DDS maintains a system's shared state, providing a single source of truth. Late and re-joining applications automatically synchronize with the current state. This ensures applications have a consistent world view even in dynamic and large-scale environments.

Unlike a traditional database, Connext DDS is a completely decentralized software databus. Data is cached in each application. Updates are published peer-to-peer to subscribing components. Applications can receive asynchronous update notifications or poll for the latest value as needed.

Enterprise Integration Patterns

Connext DDS supports all of the fundamental communication patterns used in the IIoT. In addition to data-centric publish-subscribe for distributing streaming data and asynchronous events, it offers request-reply for controlling and managing devices and an optional Queuing Service for transaction processing and load balancing. This eliminates the need to adopt and integrate different technologies for each of these requirements, reduces integration costs and simplifies administration.

DDS Compliance and Interoperability

Connext DDS complies with the OMG DDS for Real-Time Systems standard. It supports both the DDS application programming interface (API) and network interoperability protocol (DDSI-RTPS).

DDS is the only messaging standard designed specifically to meet the requirements of timing-critical systems. It can deliver over 50 times the performance of IT standards such as JMS, MQTT, AMQP, XMPP and Web Services. For applications with demanding requirements, DDS is often the only standards-compliant alternative to proprietary or custom integration approaches.

Connext DDS is the world's leading DDS implementation with more than 70% commercial market share. RTI has worked hand-in-hand with hundreds of customers to successfully deploy some of the world's most critical distributed systems. This unparalleled expertise in applying DDS to real-world problems makes RTI the best partner for your DDS project.

Industrial Grade Performance and Reliability

RTI Connext DDS provides order-of-magnitude performance and reliability advantages over most other messaging and integration middleware on every supported platform.

RTI benchmarked Connext DDS with a wide variety of latency and throughput tests. The results showed sub-millisecond latency that scaling linearly with data payload size and throughput exceeding 90% of line rate over gigabit Ethernet. Moreover, latency remains low as data throughput increases.

Connext DDS implements reliable multicast for scalable one-to-many and many-to-many data distribution. Messages only have to be sent over the network once, regardless of the number of subscribers. The product includes an optional multicast reliability protocol optimized for real-time behavior.

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