Abstract: Internet of Things (IOT) is an ambitious paradigm which significantly increases the scale of connected devices from personal electronics to industrial machines and sensors which are wirelessly connected to the Internet. In order to manage the complexity of such a scale, interworking solutions that can reuse pre-existing technologies seamlessly with newer and more efficient technologies is a requirement. Covering a wide variety of use cases, in various environments and serving diverse requirements, no single wireless standard can adequately exist. A number of different standardization bodies and groups are actively working on creating more inter-operable protocol stacks and open standards for the Internet of Things. With numerous standards deployed in the market, spreading over multiple frequency bands and using different communication protocols, choosing the right wireless connectivity technology for an IoT application can be relatively challenging. Ongoing standardization efforts towards harmonizing internet protocols for wireless sensor networks-based internet of things have raised hopes of global interoperable solutions at the transport layer and below. In this paper we review the predominant wireless connectivity technologies in the market, discuss their key technical concepts present guidelines for selection of the right wireless technology for different applications.

Keywords: Internet of Things, IoT, Smart devices, Protocols, Communication.