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The proliferation of IoT devices has led to a surge not only in sensor data, but also in data access mechanisms. To effectively harness this data and enable seamless interoperability between different IoT platforms is not a trivial problem. Rather than forcing every device into a generic data structure, which then has to be introspected by the user, Eclipse sensiNact supports the creation and use of detailed EMF models representing IoT devices. This allows Digital Twins of devices to be flexibly composed from existing models, or entirely built from scratch if custom behaviours are required. The lightweight nature of these models and Digital Twins means that they can be deployed at the edge as well as in the cloud, allowing the best balance of latency, data throughput, data processing and long-term storage to be obtained for each solution. Objective of the presentation: To give a brief introduction to the Eclipse sensiNact project and to describe how IoT devices can be dynamically connected and modelled using EMF, providing real-world examples from the City of Jena. Learning from the presentation Attendees will gain insights into the flexible, modular architecture of the sensiNact gateway, including how device connectors can be dynamically added and configured to incorporate new device protocols, and how modelling can enable the IoT devices and their digital twins to be reused and represented across the application domain. This learning will be supported and demonstrated using examples from the Jena Smart City domain.