Retrieving all entities of a specific device_class

[selmaohneh]

Hi!

I am finally planning on pushing a notification when any of my battery-powered devices is getting low. For that to work I need to get all entities that have the device_class battery (or at least have battery in the entitiy_id).

Has anyone already done that and can share some scripts?

What would be the correct approach? Is it iterating over all results from state.names(...) ?

Thank in advance for any hints!

[redlefloh]

Repinging this thread from almost 3 years ago, I couldn't find an answer anywhere but I'd love to be able to do this as well in pyscript. E.g. I have a bunch of binary sensors for my door and windows. The binary_sensors are from KNX and in KNX they get the device_class door:

- name: Livingroom
  state_address: 2/1/1
  device_class: door
  sync_state: true

Now the following YAML code works well to give my a markdown list of strings for all open doors (state == 'on', device_class=='door):

{%- for x in states.binary_sensor | selectattr('attributes.device_class', 'defined') | selectattr('state','eq','on') %}
    {%- if "door" in x.attributes.device_class %}
## <ha-icon icon="mdi:door-open"></ha-icon> {{ x.name | trim }} is open
  {%- endif -%}
{%- endfor -%}

in pyscript this then becomes:

def doors_open_in_markdown():
    doors_open=""
    for x in state.names("binary_sensor"):
        if state.get(x) == 'on':
          if len(doors_open) > 0: doors_open +="\n"
          try: friendly_name = state.getattr(x)['friendly_name'].strip()
          except KeyError: pass
          doors_open=doors_open+f"### <ha-icon icon='mdi:door-open'></ha-icon> {friendly_name} is open"
    return doors_open

But that gives me all binary_sensors in the house that are 'on', not just the door sensors because I can't filter for device_class, any suggestions other than playing with filtering based on entity_ids or the actual names that then need to match some specific pattern instead of filtering for the right device_class? I would hate to do that since a) the right information is of course there somewhere and b) it is error prone if some name happens to match the filters... Thanks!

[ALERTua]

I get all entities with state.names() filter them out, and join them in a group.batteries with group.set(object_id=group_entity_id, entities=filtered_entities)
my regex filters are:

- "^.*(nominal|voltage|chemistry|setpoint|date|sensitivity|runtime|count|health|state|temp|temperature|power|battery_power|power_meter|replaced|battery_type|last_replaced|total_out_power|total_in_power|active_power|group|battery_last_replaced).*$"
- "^.*(battery_power|power_meter|total_out_power|total_in_power|active_power|_battery_last_replaced|_battery_type)$"
- "sensor\\..*last_replaced.*"
- "sensor\\..*_battery_plus"

then there's a cron function

BATTERY_CHARGE_TRIGGER_LEVEL = 30


@time_trigger('once(10:00:00)')
@state_active("input_boolean.battery_low_notification == 'on'")
def func_battery():
    msg = '🪫'
    send = False
    group_entity = entity('group.batteries_group')
    battery_entity_ids = group_entity.attrs().get('entity_id', [])
    for entity_id in battery_entity_ids:
        entity_ = entity(entity_id)
        entity_state = entity_.state()
        if not str(entity_state).isnumeric():
            continue

        entity_state = int(entity_state)
        if entity_state < BATTERY_CHARGE_TRIGGER_LEVEL:
            entity_fn = entity_.friendly_name()
            msg += f"\n{entity_fn}\n{entity_id}\n{entity_state}"
            send = True

    if send:
        tools.telegram_message(msg, disable_notification=True)

the function cannot be used as is, but you get the idea.