I recently downloaded the codewarrior IDE and example project files for the XBee ZB modules. I have been using the old ZNET modules and have not purchased any of the ZB modules.
I'm working on a project in which we are developing different routing protocols. At first I was planning on using the 802.15.4 modules and implementing the other networking layers on the microcontroller attached to the XBee, but seeing that I can modify the code on the XBee's microcontroller, I was hoping I could then just modify the existing code.
I looked at the code in the example projects, but I had a hard time finding anything relating to routing, which lead me to believe I cannot change any aspect of that because it may be proprietary or something.