Consumer grade cyber-physical systems are becoming an integral part of our
life, automatizing and simplifying everyday tasks; they are almost always
capable of connection to the network allowing remote monitoring and
programming. They rely on powerful programming languages, cloud
infrastructures, and ultimately on complex software stacks. Indeed, due to
complex interactions between hardware, networking and software, developing and
testing such systems is known to be a challenging task. Ensuring properties
such as dependability, security or data confidentiality is far from obvious.
Various quality assurance and testing strategies have been proposed.

The most common approach for pre-deployment testing is to model the system
and run simulations with models or software in the loop. In practice, most
often, tests are run for a small number of simulations, which are selected
based on the engineers’ domain knowledge and experience.

We have implemented our approach in Python, using standard frameworks and
used it to generate scenarios violating temperature constraints for a smart
thermostat implemented as a part of our IoT testbed. Data collected from an
application managing a smart building have been used to learn models of the
environment under ever changing conditions. The suggested approach allowed us
to identify several pit-fails, scenarios (i.e. environment conditions), where
the system behaves not as expected.

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Author Of this post: <a href="">Dmytro Humeniuk</a>, <a href="">Giuliano Antoniol</a>, <a href="">Foutse Khomh</a>

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