Semantic modeling of the “Publisher-Subscriber” scheme of the IoT network for choosing broker settings

What is it about?

This article reviews the features of the Internet of Things network operation in the Publisher-Subscriber scheme via the Message Queuing Telemetry Transport (MQTT) protocol. The study has been conducted using the example of the IoT designed for monitoring of technological premises with telecommunication equipment, consisting of measurement devices, telecommunication environment, virtual and physical servers and applied software solutions. We have formalized a semantic description and have built the ontology of the subject area in order to study the IoT network’s architectural solutions, define criteria of analysis for the devices’ network activity and the physical phenomena properties under their supervision. The ontology contains the calculated indicators, responsible for network activity at different settings of the security policy, including the statistics of package volumes, time of setting and holding the connection. It includes the ranges of fluctuation of parameters and its critical values. Each of the objects in the ontology has its own digital presentation in the data bases, contains the results of measurements, statistical and spectral characteristics of data and serves practical task solution. Based on the ontology, the way for configure of the publoshers and brockers performing data collection and transmission was suggested. For this not only the statistics of requests from network logs is used, but also the characteristics obtained through the analysis of the processes monitored by IoT devices.

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Photo by Jakub Żerdzicki on Unsplash

Photo by Jakub Żerdzicki on Unsplash

Why is it important?

We have described and structured all the indicators of our Internet of Things network in the form of an ontology and can now use it to solve practical problems. The ontology-based method for configuring publishers and brokers that we propose allows us to reduce the volume of transmitted data and the activity time of IoT devices several times, ensuring monitoring of events in accordance with the dynamics of their change. It is applicable for setting of the IoT devices, including with the nonvolatile sources. The reduction of frequency of data transmission from such devices to brokers and the extension of rest periods will extend the time of their autonomous function.

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