A Lightweight Multi-tier S-MQTT Framework to Secure Communication between low-end IoT Nodes

The evolution and expansion of networking technologies have managed to create large scale connectivity among versatile devices and applications that led to the jargon internet of things (IoT). IoT has evolved due to the convergence of wireless sensor networks (WSN) and internet technologies with a view to approaching towards smart city prospects. In IoT, for maintaining device to device communication, HTTP protocol has been used for remote monitoring and analysis of data from large number of sensing elements but it consumes more power, have comparatively lesser efficiency of transmission and cannot utilize system bandwidth efficiently as well. Thus the protocols MQTT (Message Queuing Telemetry Transport), AMQP and CoAP are quite capable of handling wireless sensor traffic under very low bandwidth…