Zigbee’s Dotdot application layer has been ported to the sort-of-rival Thread protocol this week, ahead of a CES that is expected to be rammed full of smart home device announcements. The two alliances say that running the Dotdot app-stack on top of Thread’s networking stack enables the first interoperable IoT language running over an IP-based network. Both Zigbee and Thread are IEEE 802.15.4-based mesh networking protocols. Zigbee has been in the market for some 15 years, and overhauled itself in the past couple of years to provide a more unified offering – of Zigbee 3.0 and its Zigbee Cluster Library (ZCL), rather than the handful of separate options that were available (Pro, GreenPower, RF4CE, etc). Thread is a much more…