Understanding RTPS: The Real-Time Publish-Subscribe Protocol


 Real-time communication is the requirement in all applications like autonomous vehicles, robots, and factory automation. RTPS provides a highly efficient and reliable vehicle through which such systems can be made to communicate in real time.

What is RTPS?
RTPS is Real-Time Publish-Subscribe System and distributed system communication protocol used in real-time data exchange between entities. RTPS offers publish-subscribe communication wherein the publishers construct the messages and the subscribers run them but not necessarily one for another.

Principal RTPS Features:

  1. Decoupled Communication: Publisher and the subscriber are decoupled in the sense that the publishers don’t know the subscriber’s name.
  2. Real-Time Delivery of Messages: It supports delivery of the messages in real time, most critical for low-latency communication-bundled applications.
  3. Scalability: RTPS is scalable so that thousands of publishers and subscribers can be supported.
  4. Reliability: It supports message acknowledgement and retry on data loss.

RTPS vs. DDS:
Whereas RTPS is a message passing protocol, DDS is infrastructure and architecture that happens to use RTPS as a transport sublayer. DDS also provides other facilities at higher levels like quality of service (QoS) parameters and data management.


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