Does DataMiner support any steaming capabilities to subscribe for the configuration or the trending data?
WebSockets and Pub/Sub protocols are used in many event-driven architectures, and this reduces a lot of traffic that RESTful Webservices carry for the requests that happens frequently.
DataMiner supports two types of TCP/IP sockets: 1 for alarm forwarding, which is sending unsolicited messages for each alarm, and one that allows requesting information on elements and parameters. You can find more info on how to configure and use these sockets in the DataMiner Help
It is also possible to develop a driver that uses Websocket as connection to listen for updates. Further details about this implementation can be found in: DataMiner Development Library