Digital twins, defined here as the virtual representations of real-world entities to facilitate their integration with digital systems, have become a popular concept in Industry 4.0. The Six-Layer Architecture for Digital Twins with Aggregation (SLADTA) is a framework for a digital twin suitable for complex systems with a large network of devices. An important part of this architecture is using an asynchronous, secure and vendor-neutral communication protocol suitable for a large network of devices. MQTT is here evaluated as a communication protocol for a digital twin data pipeline based of SLADTA. The evaluation includes a case study for a simulated heliostat field, using MQTT through Google Cloud Platform's (GCP) IoT Core broker and the accompanying Cloud Pub/Sub service. For comparison, the case study also uses MQTT through the Eclipse Mosquitto broker. The case study demonstrates the potential of MQTT in SLADTA for complex systems' digital twins.
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