Viessmann Group is one of the world’s leading manufacturers of heating systems. Their next major product innovation was set to be a fuel cell, and, to reduce time to market, the company undertook systematic preparations for field testing. Extensive operational data needed to be collected during field testing in order to complete system optimisation as rapidly as possible. It was quickly apparent that non-functional requirements for the system were highly complex, ranging from variable data transfer intervals to dynamic growth in deployed unit numbers. Engineers also needed to be able to continuously monitor all systems and make individual adjustments as required. Zühlke was commissioned to develop a system architecture and realise a prototype.