Abstract: Various embodiments include a method for transmitting subscription data in a brokerless publication/subscription service from a data provision component to a data consumption component. The method includes: reaching agreement between the data consumption component and the data provision component upon a protocol; and transmitting the subscription data from the data provision component to the data consumption component in the protocol agreed upon.

Abstract: The method according to the invention provides for event-controlled retrieval of process data by using a publish-subscribe service, for example MQTT, and with the participation of a message broker. For the retrieval according to the invention, retrieval of a multiplicity of process data reserved in a distributed manner in the form of response messages can be carried out by a single request message. Advantageously, it permits the method according to the invention to implement a dynamic data request, in which new response messages to a request message are transmitted when changes in the process data provided or stored result. A data retrieval component transmitting the request message needs neither details about the request modalities of data-providing components nor knowledge or direct references to currently available data-providing components.

Abstract: Trigger information triggers retrieval of stored communication addresses which identify conferee terminals. Connections are then setup to terminals identified by retrieved communication addresses, respectively and the terminals are added to the conference call.

Abstract: Communication data streams are transmitted within the scope of a multipoint connection from a first terminal to other terminals. The first terminal distributes communication data streams originating at the first terminal and received from the other terminals involved in the multipoint connection. As a result, each of the other terminals receives the communication data streams originating from the other terminals.