The ubiquitous connectivity between machines, sensors and actuators, which is the IIoT, is significantly changing how goods are manufactured. It has a great potential to reduce costs, improve production efficiency, and enhance manufacturing and service quality. It also raises challenges for companies, especially for SMEs, like data management or investment costs. In this work we undertake a case study, within a robotic solution integrator SME, which addresses these two issues. We report on designing the information architecture of an OSS-based, IIoT operating and control software application for a weld-and-polish robotic cell, for which we relied on several taxonomies, identified in the literature, related to manufacturing processes. We also report the technical and managerial implications of this technical endeavour, the present case study aiming to serve as a good practice for other SMEs interested in adopting OSS as a backbone of their IIoT applications.