BigraphTalk: verified design of IoT applications

Graphical IoT device management platforms, such as IoTtalk, make it easy to describe interactions between IoT devices. Applications are defined by dragging-and-dropping devices and specifying how they are connected, e.g. a door sensor controlling a light. While this allows simple and rapid development, it remains possible to specify unwanted device configurations – such as using the same device to drive a motor up and down simultaneously, risking damaging the motor. We propose , a verification framework for IoTtalk that utilizes formal techniques, based on bigraphs, to statically guarantee that unwanted configurations do not arise. In particular, we check for invalid connections between devices, as well as type errors, e.g. passing a float to a boolean switch. To the best of our knowledge, is the first platform to support the graphical specification of correct-by-design IoT applications. provides fully automated verification and feedback without end-users ever needing to specify a bigraph. This means any application, specifiable in IoTtalk, is guaranteed, so long as verification succeeds, not to violate the given configuration constraints when deployed; with no extra cost to the user

A Formal Model for Interaction Specification and Analysis in IoT Applications

The Internet of Things (IoT) is a concept where connected entities can work and interact with each other in order to facilitate daily life. Although, many research efforts in the IoT realm have been to date devoted to device, networking and application service perspectives, formalization and analysis of IoT systems are still in their infancy. This paper introduces a new BRS-based approach aiming to support specification and verification of interaction and interoperability aspects in IoT systems. The proposed approach is based on a bigraphical-agent model that investigates the spatial structure of the IoT system and its logical structure defining the behaviour and interactions of its different entities. The Tree Query Logic (TQL) is used to formally express and verify some properties inherent to IoT system