Database server: The database server collects the state of the
resources that need to be monitored in time by communicating
with the HTTP-CoAP proxy server, which in turn takes care of
retrieving the required data from the proper source. The data
stored in the database are accessible through traditional web
programming technologies. The information can either be visualized
in the form of a web site, or exported in any open data
format using dynamic web programming languages. In the
Padova Smart City network, the database server is realized
within the WSN Gateway, which hence represents a plugand-
play module that provides a transparent interface with the
peripheral nodes.