Send notifications when NFC tag is scanned

Configuration
1

Hi, I set up an NFC tag that opens an electric lock of a gate. I have declared in the automation the Device ids of the smartphones authorized to launch the automation. Now I would like to receive a notification on my iPhone when the tag is scanned with the indication of which device to the tag is scanned. Can you help me? For info post below the automation I did:

alias: Tag pedonale finale
description: ""
trigger:
  - platform: event
    event_data: {}
    event_type: pedonale
    context: {}
  - platform: tag
    tag_id: lknvnvkdsj2nkrfoòi398
    device_id:
      - 353537.........
      - 9494094-.........
      - 80E2B08E........
condition: []
action:
  - service: switch.turn_on
    data: {}
    target:
      entity_id: switch.esp_citofono_pedonale
  - service: notify.mobile_app
    data:
      title: TAG PEDONALE
      message: Tag attivato da {{ trigger.from_state.attributes.friendly_name }}
      mode: single

Thanks to those who want to help me

2

This is a shot in the dark since I don’t use NFC and there isn’t any info in the docs about the trigger variable for Tag triggers… Maybe it follows the rules of the Event trigger, not the State trigger. If so, you would need to use that format for your template. You should be able to verify the available information from the trigger variable by sending yourself the full contents of the variable.

- service: notify.mobile_app
    data:
      title: TAG PEDONALE
      message: >-
        {{ trigger }}
      mode: single

The following is what you would use with a tag_scanned Event trigger like that given in the Tags docs example:

- service: notify.mobile_app
    data:
      title: TAG PEDONALE
      message: >-
        {% set dev_name =  expand(device_entities(trigger.event.data.device_id))
        | selectattr('domain', 'eq', 'device_tracker') 
        | map(attribute='name') | join %}
        Tag attivato da {{ dev_name }}
      mode: single
3

if I execute with trigger in the message I see this:

Executed: November 13, 2022 at 10:47:27 PM
Result:
params:
  domain: notify
  service: mobile_app
  service_data:
    title: TAG PEDONALE
    message: >-
      {'id': '0', 'idx': '0', 'alias': None, 'platform': 'event', 'event':
      <Event buonanotte[R]>, 'description': "event 'buonanotte'"}
  target: {}
running_script: false
limit: 10
4

Hi I was able to display a notification with the name of the person who scanned the tag using this code.

  - service: notify.mobile_app
    data:
      title: TAG PEDONALE
      message: '{% set person = states.person|selectattr(''attributes.user_id'', ''eq'',
        trigger.event.context.user_id)|first %}{{ person.attributes.friendly_name
        }}'
  mode: single
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