Distributed control systems for manufacturing are currently evolving towards Industrial Internet-of-Things (IIoT) systems. Sensors and actuators get equipped with internet connectivity, which allows them to interface with cloud platforms. This potentially enables a number of application cases. However, industrial “things” may be much more complex and more resource-constrained than typical consumer space “things”. This talk provides an overview of Industrial IoT application cases and sketches various challenges for researchers and practitioners using the example of turning a level sensor for industrial tanks into an IoT device.