  IoT systems are growing larger and larger and are becoming suitable for basic
automation tasks. One of the features IoT automation systems can provide is
dealing with a dynamic system -- Devices leaving and joining the system during
operation. Additionally, IoT automation systems operate in a decentralized
manner. Current commercial automation systems have difficulty providing these
features. Integrating new devices into an automation system takes manual
intervention. Additionally, automation systems also require central entities to
orchestrate the operation of participants. With smarter sensors and actors, we
can move control operations into software deployed on a decentralized network
of devices, and provide support for dynamic systems. In this paper, we present
a framework for automation systems that demonstrates these two properties
(distributed and dynamic). We represent applications as semantically described
data flows that are run decentrally on participating devices, and connected at
runtime via rules. This allows integrating new devices into applications
without manual interaction and removes central controllers from the equation.
This approach provides similar features to current automation systems (central
engineering, multiple instantiation of applications), but enables distributed
and dynamic operation. We demonstrate satisfying performance of the system via
a quantitative evaluation.
