The plethora of research, standardization and developments in Internet of Things (IoT) has increased enormously in recent years. This is due to the vast scope of IoT. Internet of Things refers to the worldwide network of interconnected objects, which allow people or things to be connected anytime, anyplace, with anything and anyone, using any path, any network and any service. The objects have different characteristics: mobile or static, with or without energy constraint, different computation and storage capabilities, equipped with different communication technologies and sensors, etc.