Networked and Embedded Systems Laboratory

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Abstract

Sensor systems are quickly becoming a flexible, inexpensive,
and reliable platform to provide solutions for a
wide variety of applications in real-world settings. For
instance, sensor systems have been used for medical
monitoring, detection and classification for defense purposes,
and to perform environmental monitoring. The
increase in the proliferation of sensor systems has paralleled
the use of more heterogeneous systems in deployments.
This paper presents a scalable, open middleware
that enables interoperability between varied sensor systems
and also details some of the fundamental services
needed in such an environment. The ESP framework
aims to provide a standard way to manage, query, and
interact with sensor systems. We provide a method to
describe sensor systems using ESPml, a XML schema,
as the modeling language. The fundamental goal of the
schema is to be able to describe sensor systems in a
simple, compact manner while still having the ability
to represent details such as the general setup, the type
of data that can be provided, and the commands that
are available. In addition, we present a web services
based framework that enables system discovery using
metadata information, interaction using system defined
functional abstractions, and the ability to publish sensor
data for future retrieval and aggregation purposes.
By implementing several systems that scale in terms of
complexity and capabilities, we show that the framework
can accommodate various types of sensor systems. Also,
performance tests of the framework show that the middleware
is able to handle high demands on services.

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