ITead's "Sonoff Zigbee 3.0 USB Dongle Plus" (model "ZBDongle-P") based on Texas Instruments CC2652P +20dBm radio MCU now sold for $19.99

Check out the Zigbee2MQTT (also known as “Z2M”) and MQTT guides/recommendations in these links:

https://www.zigbee2mqtt.io/guide/installation/

https://www.zigbee2mqtt.io/guide/usage/integrations/openhab.html

https://community.openhab.org/t/zigbee2mqtt-revisited-no-more-ugly-transformations/86362

https://community.openhab.org/t/openhab-and-zigbee2mqtt-tutorial-for-beginners/83446

https://community.openhab.org/t/openhab-zigbee2mqtt/104493

https://community.openhab.org/t/howto-use-zigbee2mqtt-with-openhab-removing-proprietary-bridges-gateways/48768

https://community.openhab.org/t/mqtt-how-to-add-zigbee-devices/106172/

https://community.openhab.org/t/oh3-tasmota-relay-via-mqtt-sonoff-basic-with-optional-dht22/111485

PS: Regardless of Zigbee adapter remember to upgrade firmware and use a long USB extension cable, as well as make sure to connect it to a USB 2.0 port or a powered USB 2.0 hub (and not USB 3.0 port).

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