Berlak, J.J.BerlakBerg, J.J.BergStangl, M.M.StanglBaumgart, L.L.Baumgart2022-03-142022-03-142020https://publica.fraunhofer.de/handle/publica/40862810.1007/978-3-030-45096-0_59Industry 4.0, IoT, and cyber-physical production systems (CPPSs) are regarded as a key factor for manufacturing companies to become more efficient, flexible, and responsive to market changes. However, all but real-time bidirectional communication between shop floor cyber-physical systems (CPSs) and IoT-based production planning and control (PPC) in a cloud environment become especially challenging regarding the de facto state of technology, as we indicate. Many CPS/CPPS projects fail in industrial practice. We describe the design and implementation of a highly automated CPPS in a real-time make-to-order usage case for the production of prescription lenses based on an environment that requires real-time communication if it is to work. We use the project experiences to explain the lessons learned and derive a holistic approach to IoT-PPC CPS and CPPS design and implementation.enconference paper