Virtual Sensor Middleware: Managing IoT Data for the Fog-Cloud Platform
Fadi AlMahamid, Hanan Lutfiyya, Katarina Grolinger

TL;DR
This paper presents Virtual Sensor Middleware (VSM), a system that manages distributed IoT sensor data across fog nodes using virtual sensors, supporting heterogeneity, dynamic sharing, and simplified application development.
Contribution
The paper introduces a novel VSM framework that extends virtual sensors for distributed processing, heterogeneity handling, and dynamic data sharing in IoT fog-cloud environments.
Findings
Supports heterogeneous IoT devices with adapters
Enables distributed sensor data processing across fog nodes
Reduces application development efforts through publish-subscribe pattern
Abstract
This paper introduces the Virtual Sensor Middleware (VSM), which facilitates distributed sensor data processing on multiple fog nodes. VSM uses a Virtual Sensor as the core component of the middleware. The virtual sensor concept is redesigned to support functionality beyond sensor/device virtualization, such as deploying a set of virtual sensors to represent an IoT application and distributed sensor data processing across multiple fog nodes. Furthermore, the virtual sensor deals with the heterogeneous nature of IoT devices and the various communication protocols using different adapters to communicate with the IoT devices and the underlying protocol. VSM uses the publish-subscribe design pattern to allow virtual sensors to receive data from other virtual sensors for seamless sensor data consumption without tight integration among virtual sensors, which reduces application development…
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