ZigBee creates start network topologies, not mesh ones. To create a completely mesh network such as
the one showed in the image below all the nodes have to have the same role, all of them have to be "end
devices + routers" so that they can route their brothers information and sleep when no action is required (saving
energy). The DigiMesh protocol (over 802.15.4) sets a completely distributed network where all the nodes talk
among them using p2p (equal to equal) datagrams.