Cannot get MQTT Discovery working

Hi!

I am trying a bit to get MQTT Discovery working, I downloaded a python script (GitHub - greenMikeEU/SmartMeterEVNKaifaMA309: Dieses Projekt ermöglicht es den Smartmeter der EVN (Netz Niederösterreich) über die Kundenschnittstelle auszulesen.) that reads parameters from my smartmeter and publishes them to mosquitto.

I wanted to adapt the script to support discovery, I currently publish following discovery message to homeassistant/device/smartmeter/config

{
  "dev": {
    "ids": "smartmeter",
    "name": "Smartmeter",
    "mf": "Shenzhen Kaifa Technology",
    "mdl": "Kaifa MA309M H4LAT1",
    "sw": "1.0",
    "sn": "",
    "hw": ""
  },
  "o": {
    "name": "Smartmeter",
    "sw": "1.0",
    "url": "https://github.com/greenMikeEU/SmartMeterEVNKaifaMA309"
  },
  "cmps": {
    "smartmeterTotalEnergyExport": {
      "p": "sensor",
      "device_class": "measurement",
      "unit_of_measurement": "Wh",
      "value_template": "{{ value }}",
      "unique_id": "TotalEnergyExport",
      "state_topic": "homeassistant/sensor/smartmeter/TotalEnergyExport"
    },
    "smartmeterTotalEnergyImport": {
      "p": "sensor",
      "device_class": "measurement",
      "unit_of_measurement": "Wh",
      "value_template": "{{ value }}",
      "unique_id": "TotalEnergyImport",
      "state_topic": "homeassistant/sensor/smartmeter/TotalEnergyImport"
    }
  },
  "qos": 0
}

In MQTT Explorer it currently looks like this:

I am trying to have the smartmeter as 1 device with multiple components (currently 2, TotalEnergyExport and TotalEnergyImport for testing, but there are more values i would like to get).

Can someone point me in the right direction or does have an example?

I find the documentation at MQTT - Home Assistant a bit confusing, I am not sure what i need to structure differently.

Thanks in advance

Cheers,
zuwizara

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