Internet of Things (IoT) has been recognized as a part of future internet and ubiquitous computing. It creates a true ubiquitous or smart environment. It demands a complex distributed architecture with numerous diverse components, including the end devices and application and association with their context. This article provides the significance of middleware system for (IoT). The middleware for IoT acts as a bond joining the heterogeneous domains of applications communicating over heterogeneous interfaces. First, to enable the better understanding of the current gap and future directions in this field a comprehensive review of the existing middleware systems for IoT is provided here. Second, fundamental functional blocks are proposed for this middleware system, and based on that feature wise classification is performed on the existing IoT-middleware. Third, open issues are analyzed and our vision on the research scope in this area is presented.

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In this paper, a module has been presented which can perform a seamless interoperation between Bluetooth and Wi-Fi interfaces. The work is really challenging to achieve as both the interfaces work in the frequency band of 2.4GHz creating a high possibility of interference. The challenge of implementing such an interoperable application atop OSGi framework has been discussed in this paper as well as the potential gain of such application has been highlighted. The proto-type implementation reported in this paper is an effort to validate the efficacy of the application as well as to incorporate the application in an OSGi based smart gateway in near future.