In [34], the implementation of a sm

In [34], the implementation of a smart monitoring system over a wireless sensor network is presented, with particular emphasis on the creation of a solid routing infrastructure through the routing protocol for low-power and lossy networks (RPL), whose definition is currently being discussed within the IETF ROLL working group. RPL was designed in order to match the requirements of networks characterized by low-power supplies and by deployment in lossy environments. This involves both wired and wireless networks deployed in difficult environments, where the presence of high interference requires adaptive and re- configurable network operations. In [35], a hybrid routing pro- tocol that combines local agility with centralized control is pre- sented. It meets the requirements of robust collection, point-to- point communication, and low footprint. It uses a distributed al- gorithm to form a Directed Acyclic Graph (DAG) for routing data from in-network nodes to border routers, allowing nodes to maintain multiple options that are ranked through data-driven link estimation