Using last_updated to check list of sensors

[makalelejsp (Piotr)]

Hi,
I wanted to create an automation which will send me a push notification when one (or more) of the sensors haven’t been updated in 24 hours, indicating need for battery replecament. I’ve tried forcing ChatGPT to give me solution, but none of them is working. (5 minutes instead of 24h for debugging purposes):

alias: Notify when sensors haven't updated for 5 minutes
description: >-
  Send a push notification to a mobile device if any sensor in the list hasn't
  communicated in 5 minutes.
triggers:
  - minutes: /1
    trigger: time_pattern
conditions: []
actions:
  - variables:
      sensors:
        - sensor.living_room_temperature
        - sensor.office_temperature
  - choose:
      - conditions:
          - condition: template
            value_template: >
              {% set stale_sensors = sensors | select('is_defined', states.get) | select('is_not', none) 
                 | selectattr('last_updated', 'is_not', none) 
                 | select('lt', (now() - timedelta(minutes=5)).isoformat()) | list %}
              {{ stale_sensors | length > 0 }}
        sequence:
          - device_id: 3a5c03b5761eed7cf87179e98545c1de
            domain: mobile_app
            type: notify
            title: Sensor Battery Alert
            message: Please check or replace the batteries.
mode: single

It says:
Error: In ‘template’ condition: TemplateRuntimeError: No test named ‘is_defined’.

ChatGPT also tried using for-loop, but I found out that for loops are extremely limited and that’s probably why it’s not working.

I got the value_template working without loop:

value_template: >
      {% set last_updated = states.sensor.temperature_sensor.last_updated %}
      {% if last_updated is not none %}
        {{ (now() - last_updated).total_seconds() > 86400 }}
      {% else %}
        false
      {% endif %}

Can you please help me to fix the script?

[makalelejsp (Piotr)]

Bump

[Troon]

@makalelejsp

I’ve tried forcing ChatGPT to give me solution, but none of them is working.

There’s a surprise. Concentrate on trying to learn to do the thing yourself .

This should work, as well as identifying which sensor has gone quiet:

triggers:
  - trigger: template
    value_template: "{{ (now()-states['sensor.living_room_temperature'].last_reported).total_seconds() > 86400 }}"
  - trigger: template
    value_template: "{{ (now()-states['sensor.office_temperature'].last_reported).total_seconds() > 86400 }}"
actions:
  - action: notify.YOUR_MOBILE_APP_ID
    data:
      message: Please check or replace the batteries in {{ trigger.to_state.name }}.
      title: Sensor Battery Alert

[makalelejsp (Piotr)]

Thanks for the answer! Triggers are working! But not trigger.to_state.name:

Error: Error rendering message: UndefinedError: 'dict object' has no attribute 'to_state'

Full code:

alias: Notify when sensors haven't updated for 24 hours
description: >-
  Send a push notification to a mobile device if any sensor in the list hasn't
  communicated in 24 hours.
triggers:
  - trigger: template
    value_template: >-
      {{
      (now()-states['sensor.living_room_temperature'].last_reported).total_seconds()
      > 86400 }}
  - trigger: template
    value_template: >-
      {{
      (now()-states['sensor.office_temperature'].last_reported).total_seconds()
      > 86400 }}
actions:
  - device_id: 3a5c03b5761eed7cf87179e98545c1de
    domain: mobile_app
    type: notify
    title: Sensor Battery Alert
    message: Please check or replace the batteries. {{ trigger.to_state.name }}
mode: single

[Troon]

@makalelejsp

But not trigger.to_state.name:

Did you try to manually run the automation? That won’t work:

Troubleshooting automations

In the three dots menu in the automation list or automation editor UI, select the Run button. This will execute all of the actions, while skipping all triggers and conditions. This lets you test the full sequence of actions, as if the automation was triggered and all conditions were true. Note that any trigger ID used in your triggers will not be active when you test this way. The Trigger ID or any data passed by in the trigger data in conditions or actions can’t be tested directly this way.

If that’s not the issue, it may be that your device action doesn’t support the trigger variable. Try using the entity-based action in my example instead.

[makalelejsp (Piotr)]

Right, I did trigger it manually indeed. I tried some other times and entities and it seems to be triggering, but {{ trigger.to_state.name }} part is missing. Notification just looks like this:

Please check or replace the batteries in .

[Troon]

Perhaps the automation logic can’t work out a trigger entity from a change in the last_reported time. Alternative would be to add an id:

triggers:
  - trigger: template
    value_template: >-
      {{ (now()-states['sensor.living_room_temperature'].last_reported).total_seconds() > 86400 }}
    id: Living_Room

then:

message: Please check or replace the batteries: {{ trigger.id }}