Home Assistant Blueprint: Offline detection for Z2M devices with last_seen

offline-notification-for-sensors-with-last_seen.yaml

blueprint:
  name: Offline detection for Z2M devices with last_seen
  description:
    Regularly test all sensors ended with '_last_seen' in name and 'timestamp' device_class
    ('last seen' Z2M sensors) to detect offline devices and if so - execute an action.
  domain: automation
  input:
    unseen:
      name: Minutes last seen
      description: Devices not seen this amount of time are assumed to be offline
      default: 60
      selector:
        number:
          min: 15
          max: 360
          unit_of_measurement: m
          mode: slider
          step: 15
    hours:
      name: Repeat at hour(a)
      description: Check devices at specified hours (time_pattern trigger value)
      default: "*"
      selector:
        text:
    minutes:
      name: Repeat at minutes(a)
      description: Check devices at specified minutes (time_pattern trigger values)
      default: "/30"
      selector:
        text:
    exclude:
      name: Exclude Devices
      description: Select MQTT device(s) to exclude from monitoring
      default: []
      selector:
        device:
          multiple: true
          filter:
            - integration: mqtt
    actions:
      name: Actions
      description:
        Notifications or similar to be run. {{sensors}} is replaced with
        the names of sensors being offline.
      selector:
        action: {}
  source_url: https://gist.github.com/gamba69/75582be835b8c57c073ef40c325de8fb
variables:
  unseen: !input "unseen"
  exclude: !input "exclude"
  sensors: >-
    {% macro zigbee_unseen(minutes) %}
    {% set result = namespace(devices=[], formatted=[]) %}
    {% for state in states %}
      {% if state.entity_id.endswith("_last_seen") and not device_id(state.entity_id) in exclude and ( 
        (not has_value(state.entity_id)) 
        or (as_timestamp(now()) - as_timestamp(state.state) > minutes * 60 )
        ) %}
        {% if not has_value(state.entity_id) %}
          {% set result.devices = result.devices + [({"name": device_attr(state.entity_id, "name_by_user"), "seen": "-" })] %}
        {% else %}
          {% set result.devices = result.devices + [({"name": device_attr(state.entity_id, "name_by_user"), "seen": state.state })] %}
        {% endif %}
      {% endif %}
    {% endfor %}
    {% set result.devices = result.devices|sort(attribute="seen") %}
    {% for d in result.devices %}
      {% if d.seen == "-" %}
        {% set result.formatted = result.formatted + [d.name ~ ' (offline)'] %}
      {% else %}
        {% set result.formatted = result.formatted + [d.name ~ ' (' ~ relative_time(strptime(d.seen, '%Y-%m-%dT%H:%M:%S%z')) ~ ')'] %}
      {% endif %}
    {% endfor %}
    {{ result.formatted|join(', ') }}
    {% endmacro %}
    {{ zigbee_unseen(unseen) }}
trigger:
  - platform: time_pattern
    hours: !input hours
    minutes: !input minutes
condition:
  - "{{ sensors != '' }}"
action:
  - choose: []
    default: !input "actions"
mode: single