Get json.attribute for template

Configuration
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1

Hi,

my wifi bbq thermometer publishes a json with all the values that I use for the Rest integration. This is what the json looks like:

{
  "temp_unit": "celsius",
  "pit": {
    "enabled": false
  },
  "pit2": {
    "enabled": false
  },
  "cpu_load": 61.671836714703,
  "cpu_temp": 57.8,
  "channel": {
    "0": {
      "temp": 29.92,
      "color": "green",
      "state": "ok",
      "temp_min": 0,
      "temp_max": 200,
      "name": "Garraum",
      "alert": false,
      "show": true
    },
    "1": {
   [...]

I am trying to set the template to the temp attribute for the entity state the same way I did it with the values in the json root (cpu_temp, cpu_load …) but I am not able to get the value. Tried different syntax and approaches (see below and way more) but nothing works.

    sensor:
      - name: "WlanThermo CPU-Temp"
        device_class: temperature
        unit_of_measurement: "°C"
        value_template: "{{ value_json.cpu_temp | round(1) }}"
      - name: "WlanThermo CPU-Last"
        unit_of_measurement: "%"
        value_template: "{{ value_json.cpu_load | round(0) }}"
      - name: "WlanThermo Zeitstempel"
        device_class: timestamp
        value_template: "{{ value_json.timestamp }}"
      - name: "Kanal 0"
        # value_template: "{{ value_json['channel']['0']['temp'] | round(1) }}"
        json_attributes_path: "$.channel[0]"
        # value_template: "{{ value_json | map(attribute='temp') | first | default }}"
        # device_class: temperature
        # unit_of_measurement: "°C"
        # value_template: "OK"
        json_attributes:
          - "temp"
          - "color"
          - "state"
          - "temp_min"
          - "temp_max"
          - "name"
          - "alert"
          - "show"

How do I properly set the value_templates for the specific channels?

2

So your three WlanThermo sensors work, but you can’t get the state to work for Kanal 0, correct? The first value_template works here:

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image1047Ă—774 65.8 KB

but I think your problem is your json_attributes_path which should include ['0'] not [0]. My guess is that this is causing the whole sensor to fail.

This tool helps. Yours:

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image954Ă—593 51.8 KB

Then fixed with ['0'] (key name rather than index):

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image954Ă—593 63.6 KB

1 Like
3

Thank you. Weirdly the [0] in json_attributes_path seems to work for the attributes:

image
image618Ă—676 23.8 KB

I just tried again with that template and now got it to work. No idea what I did wrong yesterday though as I was sure I tried this.

      - name: "Kanal 0"
        device_class: temperature
        unit_of_measurement: "°C"
        value_template: "{{ value_json['channel']['0']['temp'] | round(1) }}"
        json_attributes_path: "$.channel[0]"
        json_attributes:
          - "temp"
          - "color"
          - "state"
          - "temp_min"
          - "temp_max"
          - "name"
          - "alert"
          - "show"

Follow up question: Is it possible to put a “if … then” statement into templates? E.g. if attribute “state” is “unknown” show “Offline” else show the current temp?

4

Huh, perhaps because it’s the first key and HA is less strict than the JSONPath tool?

You can build whatever logic you want into the template. You can’t have non-numeric values with device_class and unit_of_measurement though — use the availability feature instead (docs):

availability: "{{ value_json is defined and value_json['channel']['0']['state'] != 'unknown' }}"
1 Like