Industrialised, Integrated, Intelligent sustainable Construction - I3con

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SUSTAINABLE CONSTRUCTION HANDBOOK 2 Digest authentication [17], which ensures that client passwords are not sent in clear text. It should be noted that Spring Security does not provide transport-layer security, however it can be used in conjunction with an appropriate transport layer security mechanism (e.g. HTTPS) to provide a secure data channel in addition to authentication and authorisation. The Spring Security authorisation mechanism can be used to control access to class methods, object instances, and HTTP resources (identified via a URL pattern). Two client roles have been defined for the I3CON REST API. Clients who are granted the role ROLE_WSN_QUERY are permitted to query WSN data. Clients who are granted the role ROLE_WSN_TASK are allowed to perform tasking operations on the WSN network. Clients who are granted both roles are allowed to perform WSN query and tasking operations. Spring Security can be configured to obtain client details from a variety of sources, for example an in-memory map, or a relational database. The access control mechanism required for the I3CON prototype is relatively simple, and is expected to support a small number of clients. For this reason the client details (i.e. username, password, and assigned roles) are stored in an in-memory map that is configured during application start-up from an XML configuration file. This provides the flexibility necessary to configure and change users after the system has been deployed. 140 WSN Health Monitoring Application Related work A number of related works are briefly discussed below. MOTE-VIEW is a client-tier application developed by Crossbow designed to perform as a sensor network monitoring and management tool [8]. NanoMon [9] is software developed for WSN monitoring which is also capable of visualising the history of received sensed data as well as network topology. In [10] a middleware service is proposed for monitoring of sensor networks by using sensor agent nodes equipped with error/failure information forwarding capability. An execution and monitoring framework for sensor network services and applications, called ISEE is proposed in [11]. One of the ISEE modules provides a consistent graphical representation of any sensor network. A work on using heterogeneous collaborative groupware to monitor WSNs is presented in [12]. Our work focuses on providing network health monitoring services that complies and utilises the REST-based web services SOA style. Design and Configuration of WSN Health Monitoring Application The Health Monitoring application uses data that is stored in the data base and provided by the Virtual Gateway to identify several types of possible operational problems in the WSN, as listed below: • The battery level of a mote is below a configurable threshold. • The time-stamp of the most recent measurement from a sensor is older than a configurable number of milliseconds. • No measurements have been received from a sensor. The Health Monitoring application is implemented as a Java web application that runs inside a standard servlet container, e.g. Apache Tomcat. The application can be configured to automatically analyse the health of the WSN at regular intervals, and it is also possible to manually initiate a check of the WSN through the user interface. The application is configured via a properties file located at i3con-manager/WEB-INF/application.properties. The configurable properties are shown below: • bimResource – the location of the XML resource that describes the topology and structure of the deployed WSN, e.g. file:i3con_margaritas_deployment_01.xml. This file is the same format as used by the virtual gateway. The structure of deployed WSN is shown in Figure 1. • moteLowBatteryWarningLevel – the battery level in volts below which a mote battery is considered too low. • sensorMeasurementTooOldWarningInterval – the age in milliseconds above which the most recent measurement from a sensor is considered too old.
HANDBOOK 2 SUSTAINABLE CONSTRUCTION • autoRefresh – true if the Health Monitoring application should automatically check the health of the WSN at regular intervals, otherwise false. • autoRefreshInterval – if autoRefresh is true this is the period in milliseconds at which the health of the WSN will be checked. Figure 1. I3CON WSN Topology Operation of WSN Health Monitoring Application To use the Health Monitoring application, the user must point a web browser at the following URL: http://:/i3con-manager/ The application requires a user name and password to login. These can be configured by editing the configuration file located at i3con-manager/WEB-INF/applicationContext-security.xml. Following successful login the user is presented with the default home page, as shown in Figure 2. 141
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Industrialised, Integrated, Intelligent sustainable Construction - I3con

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