Which communication protocols are commonly used within CPS Node Architecture?

In the context of Cyber-Physical Systems (CPS) Node Architecture, the use of MQTT, CoAP, and HTTP/HTTPS as communication protocols is particularly relevant due to their efficiency and suitability for the unique requirements of CPS environments.

MQTT (Message Queuing Telemetry Transport) is designed for lightweight communication, making it ideal for devices with limited processing capabilities or bandwidth. It operates on a publish/subscribe model which helps in minimizing the amount of data sent over the network and is very useful for IoT applications where devices often need to send small messages.

CoAP (Constrained Application Protocol) is specifically tailored for use in resource-constrained environments, which is a common scenario in CPS. It is designed for simple devices that might be constrained in terms of power, processing capabilities, and bandwidth. CoAP is especially significant for its ability to function over UDP, which reduces overhead in transmission and improves speed—important attributes for real-time communications required in CPS scenarios.

HTTP/HTTPS are widely adopted protocols on the web that provide a robust framework for communication over the internet. While they might be heavier compared to MQTT and CoAP, the ubiquity and support for secure communications via HTTPS make them essential for numerous applications within CPS, especially those requiring security