While much of advanced ZigBee is beyond the general scope of this book, there are several things worth knowing when you need to enable larger systems or pursue inter-operation. You are now ready to meet these higher-level concepts and consider their implications for your projects. We’ll discuss ZigBee stack layers, standardized APS messaging, routing scenarios, security, and serial flow control. Finally we’ll point you toward reference material on the ZigBee standard.

Each of these sections is intended as a jumping-off point to get you started. Need to know more? You’ll find additional detailed technical documentation in the Product Manual for the XBee ZB radios, available at: http://www.digi.com/support/supporttype.jsp?tp=3.