How to group entities into a device?

Configuration
1

I have a power strip that is manageable on a per-socket basis. I created autodiscovery MQTT switches for each of the sockets.

I currently see them as separate devices, each of them having one entity:

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Since this is actually one device with six entities, I would prefer to group them together.

Is there a way to do that when using MQTT autodiscovery? (and group several MQTT switches)

2

It certainly can be done. Zigbee2mqtt does it. Here is a discovery topic. I suspect the secret sauce is in the device: section.

{
  "availability": [
    {
      "topic": "zigbee2mqtt/bridge/state"
    }
  ],
  "device": {
    "identifiers": [
      "zigbee2mqtt_0x00158d000236a237"
    ],
    "manufacturer": "Xiaomi",
    "model": "Aqara human body movement and illuminance sensor (RTCGQ11LM)",
    "name": "Motion Stairs",
    "sw_version": "Zigbee2MQTT 1.16.2"
  },
  "icon": "mdi:signal",
  "json_attributes_topic": "zigbee2mqtt/Motion Stairs",
  "name": "Motion Stairs linkquality",
  "state_topic": "zigbee2mqtt/Motion Stairs",
  "unique_id": "0x00158d000236a237_linkquality_zigbee2mqtt",
  "unit_of_measurement": "lqi",
  "value_template": "{{ value_json.linkquality }}",
  "platform": "mqtt"
}
3

And here for example is another entity in the same device: Note that the device section is identical to the above entity

{
  "availability": [
    {
      "topic": "zigbee2mqtt/bridge/state"
    }
  ],
  "device": {
    "identifiers": [
      "zigbee2mqtt_0x00158d000236a237"
    ],
    "manufacturer": "Xiaomi",
    "model": "Aqara human body movement and illuminance sensor (RTCGQ11LM)",
    "name": "Motion Stairs",
    "sw_version": "Zigbee2MQTT 1.16.2"
  },
  "device_class": "illuminance",
  "json_attributes_topic": "zigbee2mqtt/Motion Stairs",
  "name": "Motion Stairs illuminance",
  "state_topic": "zigbee2mqtt/Motion Stairs",
  "unique_id": "0x00158d000236a237_illuminance_zigbee2mqtt",
  "unit_of_measurement": "lx",
  "value_template": "{{ value_json.illuminance }}",
  "platform": "mqtt"
}
4

Thanks @nickrout - having a common unique identifier in the device section indeed groups the entities under one device.