Cloud computing and Internet of Things (IoT), two
very different technologies, are both already part of our life. Their
massive adoption and use is expected to increase further, making
them important components of the Future Internet. A novel
paradigm where Cloud and IoT are merged together is foreseen
as disruptive and an enabler of a large number of application
scenarios. In this paper we focus our attention on the integration
of Cloud and IoT, which we call the CloudIoT paradigm. Many
works in literature have surveyed Cloud and IoT separately:
their main properties, features, underlying technologies, and open
issues. However, to the best of our knowledge, these works
lack a detailed analysis of the CloudIoT paradigm. To bridge
this gap, in this paper we review the literature about the
integration of Cloud and IoT. We start analyzing and discussing
the need for integrating them, the challenges deriving from such
integration, and how these issues have been tackled in literature.
We then describe application scenarios that have been presented
in literature, as well as platforms – both commercial and open
source – and projects implementing the CloudIoT paradigm.
Finally, we identify open issues, main challenges and future
directions in this promising field.