Was on the itead website (Sonoff) and saw this device. Could this be useful for Zigbee network diagnostics?
Looks the same as this:
(plus a few other threads where people have mentioned it, but that one is probably the most informative)
For all intents and purposes, it IS the same, a CC2531, just cheaper. For low-level diagnostics and writing Zigbee drivers it is really handy. For most people an Xbee with the XCTU software would be easier to use for diagnostics however. I have both, for looking at packets when writing a driver I use the CC2531, for looking at the state of my mesh I use the Xbee.