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Chapter 5. General Concepts, Toolkits, and Frameworks
Setting Layer
The setting layer views collections of artifacts and has to establish connectivity
among distributed artifacts. Table 2 summarizes the API for the setting layer.
Table 5.4: Setting-layer Perception
The discovery mechanism on this layer requires a distance measure that selects
the range of sensor discovery: 0 - represents all local sensors on an artifact itself,
255 - all boards in connectivity range. All values in-between represent a distance
measure based on the number of multiple communication hops required to reach
a certain sensor. Based on this distance measure, each artifact can either query
its neighbors on their primitives individually gained on the artifact layer, or it can
remotely access sensors attached to other artifacts. By tuning the signal strength of
the radio unit, the distance measure can be directly mapped to physical distances.
The retrieval methods are built up the same way as on the artifact layer (see Section
4.2.1). The only di erence is that the universal identifier of the remote artifact to
be addressed has to be included as a parameter. The main focus of the setting
layer is to combine sensor information across artifacts. To this purpose two di erent
integration paradigms have been implemented:
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