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A Wireless Sensor Network (WSN) is a network that does not rely on a fixedinfrastructure and consists of numerous sensors, such as temperature, humidity,GPS, and cameras, equipped with onboard processors that manage and monitor theenvironment in a specific area. As a result, building a real sensor networktestbed for verifying, validating, or experimenting with a newly designedprotocol presents considerable challenges in adapting a laboratory scenario dueto the significant financial and logistical barriers, such as the need forspecialized hardware and large-scale deployments. Additionally, WSN suffersfrom severe constraints such as restricted power supply, short communicationrange, limited bandwidth availability, and restricted memory storage.Addressing these challenges, this work presents a flexible testbed solutionnamed STGen that enables researchers to experiment with IoT protocols in ahybrid environment that emulates WSN implementations with the physical Internetthrough a dedicated physical server named STGen core, which receives sensortraffic and processes it for further actions. The STGen testbed is lightweightin memory usage and easy to deploy. Most importantly, STGen supportslarge-scale distributed systems, facilitates experimentation with IoTprotocols, and enables integration with back-end services for big dataanalytics and statistical insights. The key feature of STGen is the integrationof real-world IoT protocols and their applications with WSN. Its modular andlightweight design makes STGen efficient and enables it to outperform otherpopular testbeds, such as Gotham and GothX, reducing memory usage by 89\%.While GothX takes approximately 26 minutes to establish a large topology withfour VM nodes and 498 Docker nodes, STGen requires only 1.645 seconds toinitialize the platform with 500 sensor nodes.

STGen: A Novel Lightweight IoT Testbed for Generating Sensor Traffic for the Experimentation of IoT Protocol and its Application in Hybrid Network