This report presents the summary of testing activities of an Internet-of-Things (IoT) based SCADA system use for microgrids. The scope of this activity is to setup and test a prototype SCADA system that includes H/W and S/W components. The components are evaluated in terms of interoperability though tests conducted on a real microgrid at CRES’ premises in Pikermi. Apart from the devices and software installed during the tests, interoperability with third-party devices (i.e. commercial PV inverters) was also investigated. Also additional functionalities of the SCADA application such as the accuracy of calculating the Solar Azimuth were investigated. High-level functionalities such as this calculation are important in order to accurately estimate actual environmental conditions and in cases of control actions such as for solar trackers. The proposed setup consists of three main parts: the main application used as the interface console developed in Node-RED, the main communication protocol (MQTT) and field devices used for control and data acquisition (ESP32 microcontrollers). In addition to these parts, incorporation of communication libraries enables the main application in Node-RED to communicate with 3rd party devices, in this case a PV inverter via MODBUS TCP. The ultimate goal of this collaboration activity in better understanding of IoT based technologies, and use of open-source, open-license and low-cost H/W components for easy replication in other systems for research and education purposes. In the following sections this report provides an overview of the tested setup and indicative results which showcase the interoperability and ease of use for the proposed tools.