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This research presents a study on the use of the MQTT communications protocol for the Internet of Things in Smart City applications. A network model is proposed and a typical practical scenario is developed based on MQTT protocol, that cope with the requirements of some Smart City applications, mainly those which use event-based messages. Many market-available embedded electronic systems were employed for this scenario including the inexpensive Wi-Fi platform ESP8266, Arduino, Raspberry, indoi:10.5281/zenodo.2576310 fatcat:7w2rbvlogza5po3qnpb34gjrqy