The remainder of the paper is organized as follows. In
Section 2, we introduce and compare the different visions
of the IoT paradigm, which are available from the literature.
The IoT main enabling technologies are the subject
of Section 3, while the description of the principal applications,
which in the future will benefit from the full deployment
of the IoT idea, are addressed in Section 4. Section 5
gives a glance at the open issues on which research should
focus more, by stressing topics such as addressing, networking,
security, privacy, and standardization efforts.
Conclusions and future research hints are given in Section
6.