IoT Application Layer Protocols: Performance Analysis and Significance in Smart City

Internet of things as the name defines is inter- networking of things or devices such that the whole world is connected through various communication protocols so that advanced processing can be performed on the data collected and meaningful pattern of data is obtained. IoT is an evolving technology that has a very wide and big scope. It could be used optimistically to solve the world problems and improve the standard of living. IoT have tremendous application in the field of education, medicines, R&D, healthcare, agriculture. IoT is a revolution with lot of challenges and open questions still to be addressed and resolved. This paper gives a practical overview of IoT, layers of IoT and components of IoT. It presents the comprehensive evaluation of application protocols MQTT, CoAP, DDS and explains the utilization of these protocols in smart city application and challenges of smart city is also highlighted in the paper.