home assistant some facts about polling and template

[alexandrecuer]

About polling in Home Assistant :

https://www.home-assistant.io/common-tasks/general/#defining-a-custom-polling-interval

So when going to the UI, no need to migrate the scan_interval yaml parameter - https://www.home-assistant.io/integrations/emoncms/#scan_interval

how to poll each 30s with automations :

value_template will not be available after migration to config entry as something configurable when setting up the integration

integrations should provide the data in a user friendly manner and then users can use it in templates if they want

About templating in home assistant, see developer tools > template. It uses the jinja2 engine from pallets

{% for entity in integration_entities("emoncms") -%}
  feed {{ state_attr(entity, "FeedId") }} is {{ states(entity) | round(0) }}
{%- endfor %}

{% for state in states -%}
  {{ state }}
{%- endfor %}

Also see the template integration : https://www.home-assistant.io/integrations/template/

you can do templating from the UI by creating template sensors, each template sensor being a sort of copy of a real workd sensor, with a specific unique_id

You can also do the templating in the configuration.yaml. This permits to deal a whole bunch of entities in one shot, but without unique_ids for the created sensors

template:
  - trigger:
      - platform: time_pattern
        seconds: "30"
    sensor:
      - name: 'round-cellule_tcircuit'
        state: "{{ states('sensor.emoncms_cellule_tcircuit') | round(0) }}"
        unit_of_measurement: "°C"
        device_class: temperature
      - name: 'round-nordtcircuit'
        state: "{{ states('sensor.emoncms_nordtcircuit') | round(0) }}"
        unit_of_measurement: "°C"
        device_class: temperature