Failing to extract value from JSON via MQTT

Hi Everyone,

I am struggling to extract a value from a JSON Object and was wondering if someone could help me out.

This is the JSON:

{
  "end_device_ids": {
    "device_id": "eui-bc97",
    "application_ids": {
      "application_id": "klax-1"
    },
    "dev_eui": "BC9740",
    "join_eui": "70B3D5",
    "dev_addr": "260B7"
  },
  "correlation_ids": [
    "gs:uplink:01HPRZG71HTSG"
  ],
  "received_at": "2024-02-16T12:50:44.094863791Z",
  "uplink_message": {
    "session_key_id": "AY1o2VXaOfg8o",
    "f_port": 3,
    "f_cnt": 344,
    "frm_payload": "BEVVEQMJAUVTWREDm8SFAREPS38Qq0t/EE1Lfw/gS38PdA==",
    "decoded_payload": {
      "header": {
        "batteryPerc": 100,
        "configured": true,
        "connTest": false,
        "deviceType": "SML Klax",
        "meterType": "SML",
        "version": 1
      },
      "msgInfo": {
        "msgCnt": 1,
        "msgIdx": 85,
        "msgNum": 1
      },
      "payloads": [
        {
          "id": "090145535911039bc485",
          "type": "serverID"
        },
        {
          "register": {
            "filterActive": true,
            "filterId": 0,
            "unit": "Wh",
            "values": [
              {
                "valid": true,
                "value": 16715947
              },
              {
                "valid": true,
                "value": 16715853
              },
              {
                "valid": true,
                "value": 16715744
              },
              {
                "valid": true,
                "value": 16715636
              }
            ]
          },
          "type": "filter"
        }
      ],
      "type": "app"
    },
    "rx_metadata": [
      {
        "gateway_ids": {
          "gateway_id": "eui-58a0",
          "eui": "58A0CB"
        },
        "time": "2024-02-16T12:50:43.775126934Z",
        "timestamp": 4243676867,
        "rssi": -91,
        "channel_rssi": -91,
        "snr": 9.5,
        "location": {
          "latitude": 50.950,
          "longitude": 11.0,
          "source": "SOURCE_REGISTRY"
        },
        "uplink_token": "CiIKIAoUZXVpLTU4YTBjYmZmZmU4MDU0NTISCFigy//+gFRSEMO9xecPGgwIo7S9r",
        "received_at": "2024-02-16T12:50:43.863979522Z"
      }
    ],
    "settings": {
      "data_rate": {
        "lora": {
          "bandwidth": 125000,
          "spreading_factor": 7,
          "coding_rate": "4/5"
        }
      },
      "frequency": "868300000",
      "timestamp": 4243676867,
      "time": "2024-02-16T12:50:43.775126934Z"
    },
    "received_at": "2024-02-16T12:50:43.890499663Z",
    "consumed_airtime": "0.092416s",
    "version_ids": {
      "brand_id": "alpha-omega-technology",
      "model_id": "klax",
      "hardware_version": "2.0",
      "firmware_version": "2.0",
      "band_id": "EU_863_870"
    },
    "network_ids": {
      "net_id": "000013",
      "ns_id": "EC656E0000000181",
      "tenant_id": "ttn",
      "cluster_id": "eu1",
      "cluster_address": "eu1.cloud.thethings.network"
    }
  }
}

and this is my config

mqtt:
  sensor:
    - name: "Stromverbrauch"
      state_topic: "ttn/v3/klax-1@ttn/devices/eui-bc9740d2c7/up"
      value_template: "{{ value_json.uplink_message.decoded_payload.payloads[1].register.values[0].value }}"
      unit_of_measurement: "Wh"
      unique_id: klax_keller
      device:
        identifiers: "klaxhome"
        manufacturer: "AO-T"
        name: "Stromzähler"

This approach has already worked a couple of times but this is the first time I am using “” to choose object within a JSON. And somehow this doesn’t work. I don’t see a value beeing registered in the MQTT Entity.

Really appreciate any help I can get.

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