MQTT Sensor : how to define last_reset_value_template

Configuration
,
18

Yes, no more customization !

My ZMAI90’s like this

  - platform: mqtt
    name: "Mains Consumed Energy"
    state_topic: "electricity1/tele/RESULT"
    value_template: >- 
      {% set message = value_json.SerialReceived %}
      {% set payload = message[6:14] %}
      {% set payload_len = (payload | length) %}
      {% set result = namespace(value='') %}
      
      {% for i in range(0, payload_len + 1) | reverse -%}
        {%- if i is divisibleby 2 -%}
          {%- set result.value = result.value + payload[i:i+2] -%}
        {%- endif -%}
      {%- endfor -%}
      
      {{ (result.value|float) / 100 }}
    unit_of_measurement: 'kWh'
    unique_id: "mains_consumed_energy"    
    device_class: energy
    state_class: measurement
    last_reset_topic: 'electricity1/tele/RESULT'
    last_reset_value_template: '1970-01-01T00:00:00+00:00'

and my global consumption like this :

template:
  - sensor:
      - name: "House electricity energy"
        unit_of_measurement: 'kWh'
        state: >
          {{ (states("sensor.mains_consumed_energy") | float + states("sensor.upstairs_consumed_energy") | float) + (states("sensor.extra_consumed_energy") | float)  | round(2) }}       
        device_class: energy
        state_class: measurement      
        attributes:         
           last_reset: '1970-01-01T00:00:00+00:00'
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