Extend range of zigbee network using CC2531/CC2530 routers · Issue #52 · Koenkk/zigbee2mqtt · GitHub
Create a CC2530 router | Zigbee2MQTT
reflash CC2531 after not work, now pairing problem with xiaomi · Issue #172 · Koenkk/zigbee2mqtt · GitHub
ITEAD of Sonoff fame now sells a very inexpensive Zigbee USB dongle that should work out-of-the-box with both Zigbee2mqtt and the ZHA integration - Zigbee - Home Assistant Community
CC2531 - ZigBee - Mit Router oder Coordinator Firmware - Smart8266🌐