I've been out of the loop on Zigbee for a while now. Was wondering who has the most mature Zigbee stack... Is it Microchip, Chipcon, Atmel?
Has anyone got RF Modules down to less then $10 yet?
I recall there was some licensing issues with certain stacks a while back...
We've been using the Ember Corporation SoC chips for some time now. I'm very impressed with their chip, tools, and utilities. Some companies are using them for plug in modules, Digi's XBee and Telegesis are two that we have worked with.
Ember also has the ZCL and the HA and SA profiles implemented, ready for you to use.
www.ember.com
We also use Ember with the secure energy profile. Their IDE/debugger is actually quite good. Their Zigbee stack seems somewhat buggy, at least for the compile options that we use. They are continuing to release new versions so I'm not too concerned about the eventual health of their code. I am worried about the work on our end to drop new stack versions into our codebase, as their stack is not in a completely modular library.