A Reliable CoAP Protocol for IoT Communication

Abstract

The request-response model for constrained devices is achieved via RESTful architecture of Constrained Application Protocol (CoAP) in IoT. An enhanced CoAP is proposed to address the limitations of CoAP to achieve an efficient IoT network. Unlike existing protocols that operate on instantaneous Round-Trip Time (RTT) in IoT, it also makes use of CoAP options, payload, and node distance for defining the network state in a better way. Various new parameters viz. timestamps, priority, message path, device status is introduced and CoAP payload is defined using SenML representation of data. The processing unit at the network level is used for data analysis of the integrated parameters that are timely communicated to this unit from the network nodes. The algorithm with varying data rates is used in homogeneous and mixed traffic to calculate the performance. The significant improvement in terms of delay, priority, congestion, retransmissions ensure reliable communication in the network.