**2. Materials and Methods**

The proposed integrated system encompasses the analytical device that was connected to an IoT software platform, henceforth IoT platform, via a wireless sensor network. The description of the device design is highlighted in Section 2.1. Section 2.2 presents the IoT platform and discusses the middleware that supports the system. Section 2.3 describes the implementation of the IoT water quality monitoring system in a wastewater treatment plant scenario. Finally, Section 2.4 details the methodology followed in this investigation for a preliminary validation of the system.
