Networking Reference
In-Depth Information
Chapter 4
The Sensor Integration Module (SIM)
Abstract The SmartSensor architecture encompasses three main software modules:
(i) the Sensor Integration Module (SIM), (ii) the Programming and Execution Mod-
ule (PEM), and (iii) the Web 3.0 Integration Module (WIM). In this Chapter we detail
the SIM logical and physical components as well as their operation. In the SmartSen-
sor infrastructure a set of wireless sensor networks (WSN) is connected to the Web
through one gateway node, that exposes to client applications the sensing data pro-
duced by the networks as RESTful Web resources. The Sensor Integration Module
(SIM) is responsible for providing the RESTful interface to access the resources of
a given WSN. Its components receive application requests describing their desired
sensing data, translateHTTPmessages to and from the several sensor specific formats
and protocols, coordinate the functions needed to meet the received sensing tasks
and manage the different communication models required to produce and deliver the
data back to the requesting applications.
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Keywords Web of Things (WoT)
REST
HTTP
XML
JSON
Wireless sensor
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networks
Integrating WSN
Restful services
4.1 Overview
As previously stated, the SmartSensor project considers a system consisting of a set
of wireless sensor networks with technologies/platforms possibly distinct, connected
to the Web through one gateway node, and a set of client applications. The WSNs are
exposed and their data accessed by applications as Web resources, using the concept
of RESTful services. The access to the resources provided by a specific WSN is real-
ized through the Sensor Integration Module (SIM). The following Sections present
the SIM logical and physical architecture, describing how its software components
are deployed in each type of node that composes the SmartSensor infrastructure. As
we discussed, SIM components are deployed in sensor nodes and in gateway nodes.
 
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