DDS

DDS is a data bus used for integrating intelligent machines. Like MQTT, it also uses a publish/subscribe model for readers to subscribe to topics of interest:

DDS allows communications to happen in an anonymous and automated fashion, since no relationship between endpoints is required. DDS also supports Quality of Service (QoS) mechanisms. DDS is designed primarily for device-to-device communication and is used in diverse deployment scenarios, including wind farms, medical imaging systems, and asset tracking systems.