A Real Network Performance Analysis Testbed for Encrypted MQTT in DMS

The paper discusses the development of a security-oriented VLAN testbed for Distributed Measurement Systems (DMS) in the context of increasing cyber threats targeting critical infrastructure. The proposed solution involves using local MQTT brokers, TLS tunnels for local data transmission, and SSL tunnels for secure communication with a cloud-based central broker. The study evaluates network performance metrics such as runtime, bandwidth, and throughput to determine the optimal network configuration for different Quality of Service (QoS) levels. While the research does not introduce new methods for securing measurement data, it assesses the performance of existing techniques on constrained hardware, such as the Raspberry Pi 4, which is typical for IoT-based DMS. This work represents the initial phase of a broader research effort aimed at improving data transmission and encryption in IoT networks, with a focus on ensuring compatibility with existing infrastructures and enhancing security in challenging environments.