"When the application layer has chosen a network to join, the network layer
selects a “father” node and requests to start the association procedure. When
successfully receiving the indication of the association request, this node assigns
its own network address according to the given address information from the
coordinator. Figure 4 shows the three NWK topologies (Hersent, Boswarthick, &
Elloumi, 2011; Labiod, Afifi, & Santis, 2007 ..."