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Zigbee devices Switches and relays

Aqara QBKG39LM

Smart wall switch E1 (no neutral, double rocker). Works with Zigbee2MQTT with no vendor hub or cloud: it pairs with a Zigbee stick and shows up in Home Assistant.

Vendor
Aqara
Model
QBKG39LM
Type
Switches and relays
Power
mains: usually a router that extends the mesh
Firmware updates (OTA)
yes, through Zigbee2MQTT

Find it in shops: AliExpress

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What it exposes

FeaturePropertyValuesControl
On / off (left)state_left—settable
On / off (right)state_right—settable
Device temperaturedevice_temperature°Cread only
Operation mode (left)operation_mode_leftcontrol_relay, decoupledsettable
Operation mode (right)operation_mode_rightcontrol_relay, decoupledsettable
Mode switchmode_switchanti_flicker_mode, quick_modesettable
Remember state after power losspower_outage_memory—settable
Flip indicator lightflip_indicator_light—settable
Action (button press)actionsingle_left, double_left, single_right, double_right, single_both, double_bothread only

MQTT: state and commands

Zigbee2MQTT publishes the device state to zigbee2mqtt/my_device (my_device is the name you give the device). An example message:

{
  "state_left": "ON",
  "state_right": "ON",
  "device_temperature": 31,
  "operation_mode_left": "control_relay",
  "operation_mode_right": "control_relay",
  "mode_switch": "anti_flicker_mode",
  "power_outage_memory": false,
  "flip_indicator_light": false,
  "linkquality": 120
}

Send commands to zigbee2mqtt/my_device/set:

mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"state_left":"TOGGLE"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"state_right":"TOGGLE"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"operation_mode_left":"decoupled"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"operation_mode_right":"decoupled"}'
mosquitto_pub -t zigbee2mqtt/my_device/set -m '{"mode_switch":"quick_mode"}'

Watch the topics live from the browser: MQTT client.

Home Assistant automation example

Zigbee2MQTT creates Home Assistant entities from the device name. If it is called my_device, an automation in automations.yaml can look like this:

- alias: "Off at night"
  mode: single
  triggers:
    - trigger: time
      at: "23:30:00"
  actions:
    - action: switch.turn_off
      target:
        entity_id: switch.my_device_left

Check the YAML: YAML checker.

How to pair it

  1. In Zigbee2MQTT click Permit join.
  2. Put the device in pairing mode: usually a long press of the reset button (5–10 s) until the LED blinks; bulbs: switch the power off and on 5–6 times.
  3. Keep the device close to the coordinator or a router while pairing.
  4. Give it a clear name: MQTT topics and Home Assistant entities are built from it.

Exact procedure and model notes: the device page in the Zigbee2MQTT docs. No coordinator yet: coordinator picker.

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