Refinement and Verification for IoT Service Composition

Internet of Things (IoT) is a finite set of interconnected devices that can cooperate and interact with each other through the Internet. As the number of IoT devices have increased, the number of services increased as well, further complicating the process of service composition. In this paper, an Event-B formal model is presented to verify the correctness of the IoT service composition (IoTSC) system. In addition, the proposed model satisfies some functional and non-functional properties such as compatibility and availability to fulfil the requirements of the IoTSC. Our model is developed incrementally from abstract level to target level by using the refinement mechanism. A Fire Alarm Detection System is used as a case study for our model. Finally, we use proof obligations and the Rodin platform to validate and proof the correctness of the proposed formal model.