Managing heterogeneous software and hardware artifacts from multiple suppliers is a complex and challenging process. The integration of sensors, actuators, and their controllers, modeled as IoT elements, also presents significant challenges. Typically, a vendor supplies one or more parts, each one with its proprietary interface, which may raise vendor lock-in and supplier dependencies that can compromise the replacement of some of the artifacts by equivalent ones from competing vendors. The research presented in this paper addresses such challenges in the context of the SITL-IoT project aiming at transforming an industrial agri-food environment towards an open, integrated system-of-systems. We present and discuss a reference implementation of a collaborative platform to simplify the management of different artifacts, supplied by alternative suppliers, modeled as services. More specifically, the concepts of ISystem (Informatic System), CES (Cooperation Enabled Service), and Service are used to manage the different elements that compose an agri-food environment transparently and uniformly. We argue that the adopted model simplifies the collaboration among technology suppliers along the life cycle maintenance and evolution of their enabled products.