The present study addresses the technical opportunity of supplying reactive power from a coordinated group of inverter-based renewable resources (IBRs) integrated into an active distribution network (ADN), using a centralized control algorithm with unidirectional communication. The key feature of the proposed control is its simplicity, in terms of the control and the required communication infrastructure. A linear formulation allows for demonstrating stability in the sense of Lyapunov. An IoT platform was designed to evaluate the performance of the proposed control under a realistic situation, considering variations in renewable power generation and communication delays.