Services can publish information to the broker regardless how many clients are
interested in this information; if no client has subscribed to it the broker does not
forward the notification to any client, if more clients have subscribed to the
same information the broker will multiply the information and send out
notification to each subscriber.
Figure 50 Publish/Subscribe-pattern 2 clientsInformation flow through functional components
User requests information from IoT Service
Figure 51 shows the information request from a user to an IoT Service and the
corresponding response.
Figure 51 : User requests IoT service.