Note to self: the Digi Series 2 ZigBee chips (XB24) require the XB24-ZB selection in X-CTU. You need to pick ZigBee Router AT and ZigBee Coordinator AT in order to update them to the latest firmware revision.
Also, to use picocom as suggested in the Wireless Sensor book, download and compile from source. The version available in Ubuntu is stale (1.4 vs. 1.6) and doesn’t support the –echo command.
Finally, note that the ATDL address for the two chips should be that of the other chip. You are specifying the destination address.
Got my two ZigBee’s to talk to one another!
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