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Internet of Things (IoT) encompasses a broad set of technologies, hardware and software stacks. The rapid evolution and broadened scope can be attributed to the inclusion of many existing mature technologies like the wireless sensor networks, RFID and a wide variety of custom solutions and newer smart devices. There is a growing need for devices to collaborate to provide the desired service. The heterogeneity coupled with theresource constrained nature of the devices seriously limits the choices in design. The capability to onboard billions of devices on to the existing infrastructure without degrading the quality of service is robust programming frameworks are in place more crucial. Automation enables devices to act independently which can be enabled only by ensuring. Architectural modelsaddressingthe challenges like scalability, distributiveness, interoperability and programmability are the need for the hour.