This is essentially the 0.4 Software Serial release with a bug fix or two. 2/28/15 The code is now on github as the googlecode has shutdown.9/15/15 Matthijs Kooijman has contributed numerous enhancements to the library, including callbacks, enhanced debugging, added features and bug fixes! These can be found in the 0.6.0 release.He covers the fundamentals of working with XBees in API mode, including some advanced topics (encryption, security, sleep), as well as creating projects with this library. 11/18/15 Matthijs Kooijman's new book, Building Wireless Sensor Networks Using Arduino is now available.This library Includes support for the majority of packet types, including: TX/RX, AT Command, Remote AT, I/O Samples and Modem Status. Arduino library for communicating with XBees in API mode, with support for both Series 1 (802.15.4) and Series 2 (ZB Pro/ZNet).