Constrained link layer technologies: The IoT nodesmounted
on the streetlight poles form a 6LoWPAN multihop cloud, using
IEEE 802.15.4 constrained link layer technology. Routing functionalities
are provided by the IPv6 Routing Protocol for Low
power and Lossy Networks (RPL) [35]. IoT nodes are assigned
unique IPv6 addresses, suitably compressed according to the
6LoWPAN standard. Each node can be individually accessible