Sensor-information storage
Figure 55 shows the special case of using an information storage device which
stores additional, e.g. historic, values. The IoT Service DataStorage requests
values and the StorageDevice sends the corresponding response. The storage
policy of the Storage Device is application-specific, e.g. stores values only for
certain duration, stores values with reduced granularity over time or in an
averaged or aggregated form. Such a storage device can also be used from the
VE Service level.
Figure 55 : Usage of sensor information storage device.IoT Service resolution
The Functional Component IoT Service Resolution hosts the Service
Descriptions that are needed for looking up and discovering IoT Services. Thus
the resolution component offers methods to insert, update, and delete Service
Descriptions (see Figure 56 ) according to the availability of IoT Services. The
methods are meant to be invoked by the IoT Services itself, e.g. upon their
deployment, dynamic change of location due to mobility or their undeployment
from the system. It is also possible for the Service Management component to
invoke these methods in order to maintain the system. For deleting a Service
Description its Service ID needs to be given.