Internet of Things systems design and development suffers from heterogeneity in different aspects. The component behaviors also change due to events being internal or external and the system needs to take action subsequently. In this paper, we demo the event-based modeling capabilities of the CHESSIoT tool on a smart parking application. Different components was been decomposed with functional and behavioral specifications following the component-based approach. In the end, we have given a brief description of the future work.