A Correct by Construction Model for CBPS Systems Verification

The Internet of Things (IoT) comprises a group of interconnected devices that communicate through the internet, necessitating a robust infrastructure and security protocols. Within this ecosystem, the Content-based Publish-Subscribe (CBPS) messaging paradigm enables devices to subscribe to specific data or events. However, as the number of messages transmitted increases, ensuring reliable transmission and accurate event matching becomes a challenging task. To tackle this issue, this study proposes an Event-B formal model for verifying the correctness of IoT CBPS communication. The model aims to guarantee that messages are delivered to the intended devices while ensuring the appropriate use of context information for filtering messages. Furthermore, the model's consistency has been verified using Event-B tools.