Here is a guide for ESPHome on converting from Zigbee Coordinator into a Zigbee Router device:
Steps will be almost the same as for the original Sonoff Zigbee Bridge so for Tasmota can follow this:
- How to Convert the Sonoff Zigbee Bridge into a Router / Repeater | digiblurDIY
- in combination with: A Wired Sonoff Zigbee Alternative – The Helpful Idiot
PS! Just to clarify one thing; note that once you have flashed the EFR32MG21 module with Zigbee Router firmware then it will only act a Zigbee Router, thus there will be no LAN-network connection to the Zigbee chip, and that works disconnected from the LAN-network. So do not think that you can use it as a Zigbee extender over your LAN-network, that is not possible to achieve with Zigbee. If you have two separate locations then you either need to use two completly separate Zigbee networks, or you can use loads and loads of Zigbee Router devices that act as repeaters to cover the entire area between the Zigbee Coordinator and the end device, (it is not possible to bridge the gap by converting Zigbee to IP and then back again to Zigbee within the same Zigbee network). For more tips on extending a Zigbee network see all the tips in this guide: