Integrate Zigbee devices with Home Assistant via Zigbee2MQTT and a USB coordinator

Steps

1. Connect a Zigbee USB coordinator (e.g., a CC2652-based stick) and identify its serial port; install Zigbee2MQTT following the official guide and configure configuration.yaml with the correct serial port path and your MQTT broker address
2. Set homeassistant: true in configuration.yaml to enable Home Assistant MQTT discovery; Zigbee2MQTT will automatically publish MQTT discovery messages so entities appear in Home Assistant without manual configuration
3. Enable device joining by publishing {"value":true} to zigbee2mqtt/bridge/request/permit_join or using the Zigbee2MQTT frontend; put the device in pairing mode according to the device's instructions (typically a button sequence)
4. Once paired, the device appears in the Zigbee2MQTT devices list and its state is published to zigbee2mqtt/<friendly_name>; send control commands by publishing JSON to zigbee2mqtt/<friendly_name>/set (e.g., {"state":"ON","brightness":150})
5. Disable permit_join after pairing to secure the network; rename devices using zigbee2mqtt/bridge/request/device/rename with {"from":"<ieee_addr>","to":"<friendly_name>"} for readable topic names
6. Monitor the zigbee2mqtt/bridge/state and zigbee2mqtt/bridge/event topics for coordinator health, device join/leave events, and interview completion; check the log topic for errors