Ilya Kirov (kirovilya on GitHub) has released source code for building Z-Stack 3.0 Zigbee 3.0 firmware for Texas Instruments CC2530 based devices with support for a single relay and external sensors, currently tested for Sonoff BASICZBR3 and a DS18B20 1-wire temperature sensor.
As far as I know, this is a first as Sonoff BASICZBR3 (Zigbee version of Sonoff BASIC R3 by ITead) is based on a CC2530 Zigbee module and Texas Instruments officially only released Z-Stack Home 1.2 core for it which only support ZHA 1.2 (Zigbee Home Automation 1.2) stack.
- https://www.cnx-software.com/2020/05/25 ... tion-tool/

Sonoff BASICZBR3 with CC2530 Zigbee module and DS18B20 1-wire temperature sensor
You’ll find source code on GitHub (requires Texas Instruments development software to compile):
- https://github.com/diyruz/diyruz_rt
kirovilya also posted a long technical post explaining development work (written in Russian):
- https://habr.com/ru/company/iobroker/blog/495926/
Google Translate link for kirovilya's developers write up:
- https://translate.google.com/translate? ... F495926%2F