Suggest that this other thread before you start look too close at making your own DIY Zigbee devices:
In short, I do not recommend trying to make DIY Zigbee at this time as there are no easy platforms for it.
Instead recommend that you look at making WiFi or Ethernet devices based on ESP32 hardware and ESPHome firmware.
You do not want that, if you want to pair a DIY Zigbee gateway then you can not use that with a propriatory Zigbee Gateway, you instead need to use it with a open-source Zigbee Gateway like the ZHA integration (coded in Python) or Zigbee2MQTT (coded in TypeScipt/JavaScript), and to use any one of those you should first buy a the CC2652P-based Sonoff ZDongle-P USB dongle and use that with either Home Assistent’s built-in ZHA integration or the stand-alone Zigbee2MQTT software as Zigbee Gateway. See:
- Zigbee buyer's guide
- Is Zigbee right for you?
- Zigbee networks: how to avoid interference and get the best range and coverage
- Migrating from a Philips Hue bridge to SkyConnect
- A to Zig - a Zigbee glossary
- Not many people know that - a random collection of Zigbee trivia
- How to set up custom device handler quirks in ZHA