Digi XBee® is the most popular module for building zigbee mesh networks. Our new zigbee 3.0 firmware is coming soon
which will combine many of the zigbee application layers and will natively support dotdot, the next chapter in enabling smart objects to work together on any network. So, you can confidently design in Digi XBee
without having to worry about compatibility with future developments around dotdot. As a matter of fact, the best path to dotdot is with zigbee today.
to read more about dotdot from the zigbee alliance.