Middleware IoT protocols performance evaluation for carrying out clustered data

Several IoT middleware protocols have been proposed for the wireless transfer of IoT data. The main representatives are the CoAP, the SOAP, the MQTT and the HTTP protocols. The main concerns on these technologies are the delay, packet loss, processing effort and power consumption that IoT devices demand, in order to successfully transfer wireless data to the cloud. In exchange for the reduction of the power consumption, many of these technologies try to lower the data throughput, minimize security, or even reduce the distance range of device coverage. In this paper authors compare the performance of IoT application protocols, based on M2M delay and the extra payload that they enforce to the transmitted data. Experimentation tests reveal which protocol is best suited for different network and application scenarios accordingly.