Machines are becoming an important participant in communication networks, from industry to smart homes. Essentially, Machine-to-Machine communication (M2M), also called Machine Type Communications (MTC), refers to automated applications executing on smart devices or machines that communicate through a wired and/or wireless network with very little human intervention or none at all. This book deals with the use of IEEE 802.15.4 / ZigBee communications technology to service M2M traffic. In order to improve the performance of the network for M2M nodes, we propose improvements to the protocol...