A Comprehensive Development and Testing of Improved Publish-Subscribe Method for IoT

Internet of Things (IoT) is a network of smart devices which communicate with each other to accomplish task or provide any particular service. In IoT, smart objects have to provide services continuously by realizing requirement of a person without disturbing him. To accomplish this task, IoT devices need to share information with each other as soon as it updates. In such condition, request-response technique creates overhead on the system. So publish-subscribe technique is used to get an immediate response as soon as data changes. Service consumer or subscriber needs to send a request for particular service to the broker. The broker will maintain the list of the subscriber and will forward data to all subscribers as it updates. But this broker creates single point bottleneck in publish-subscribe communication. In this paper, distributed publish-subscribe techniques has been proposed which will distribute publishers and subscribers on the different brokers removing single point bottleneck. It will also distribute the load of brokers and improve the availability of service. For simulation purpose, we have used QualNet 5.1 simulation tool. Simulation is done by using parameters like number of total packets received by all nodes in simulation, end to end delay as number of nodes increases also number of total packets received by all nodes in simulation as number of transaction increases.