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In this demonstration, we will construct and visualize a scalable fog computing-based multi-layer Internet of Things (IoT) platform that supports various application scenarios. Within the platform, we assess its performance in terms of latency, wait time, and processing load as QoS metrics. We examine scenarios where applications generating different alarm levels, resulting in multi-priority decision data traffic across clients and sensor nodes. This proposal provides an overview of the platform, including its layered design, the demo setup, and how QoS is addressed across the different layers.