Compose one device tracker for a person in Home Assistant by composing multiple stationary and gps trackers

Composite_device_tracker.yaml

blueprint:
  name: Composite person device tracker
  description: compose one tracker for a person by composing multiple stationary (BLE/Router)
    and GPS trackers
  domain: automation
  input:
    composite_name:
      name: composite name
      description: The name for the composite tracker. Be carefull when changing the
        name afterwards, as the automation will create a composite tracker when it
        doesn't exist yet! (Trackers can be deleted by removing them from known_devices.yaml)
      selector:
        text:
          multiline: false
          multiple: false
    trigger_at_startup:
      name: Trigger at Home Assistant startup
      description: Initialize the composite tracker at startup, based on the stationary trackers.
      default: true
      selector:
        boolean: {}
    input_trackers:
      name: input trackers
      description: Select (bluetooth, router or GPS) device_trackers and/or (connectivity or presence) binary sensors
      selector:
        entity:
          filter:
          - domain: device_tracker
          - domain: binary_sensor
            device_class: 
             - connectivity 
             - presence
          multiple: true
          reorder: false
  source_url: https://gist.github.com/erkr/6dbe8c9ec6feaef8102afff3786a5bd0#file-composite_device_tracker-yaml
triggers:
- trigger: state
  entity_id: !input input_trackers
  id: 'tracker'
  variables:
    latitude: '{{ trigger.to_state.attributes.latitude | default(0) }}'
    longitude: '{{ trigger.to_state.attributes.longitude| default(0) }}'
    gps_accuracy: '{{ trigger.to_state.attributes.gps_accuracy | default(10) }}'
    gps_update: "{{ latitude!=0 and longitude!=0 }}"
  enabled: true
- trigger: homeassistant
  event: start
  id: 'startup'
conditions:
  - alias: Filter non-relevant stationary triggers
    or:
    - condition: template
      value_template: "{{ trigger.id=='startup' or gps_update|default(false) }}"
    - condition: template
      value_template: >
        {% set old_state=states(composite_tracker) %}
        {% set home=['home','on'] %}
        {{  trigger.to_state.state not in home 
            if old_state=='home' else
            trigger.to_state.state in home}}
actions:
- choose:
  - conditions:
    - alias: special activations
      or:
      - condition: template
        value_template: '{{ trigger is not defined or trigger.id is not defined }}'
        alias: manual execution of automation
      - condition: template
        value_template: "{{ trigger.id=='startup' and trigger_at_startup }}"
        alias: Initialize at startup
    sequence:
    - variables:
        on_premises: >
           {{ expand(input_trackers) 
              |rejectattr('attributes.latitude','defined') 
              |rejectattr('attributes.longitude','defined') 
              |selectattr('state','in',['home','on'])|list|count> 0 }}
        new_state: '{{ ''home'' if on_premises else ''not_home'' }}'
    - action: device_tracker.see
      data:
        dev_id: '{{composite_name}}'
        location_name: '{{ new_state }}'
      alias: Publish startup location name
  - conditions:
    - condition: template
      value_template: "{{ trigger.id=='tracker' and gps_update|default(false) }}"
      alias: If GPS coordinates known
    sequence:
    - action: device_tracker.see
      data:
        gps:
        - '{{latitude}}'
        - '{{longitude}}'
        dev_id: '{{composite_name}}'
        gps_accuracy: '{{gps_accuracy}}'
      alias: Publish GPS
  - conditions:
    - condition: template
      value_template: "{{ trigger.id=='tracker' and not gps_update|default(false) }}"
      alias: If triggered by a stationary tracker
    sequence:
    - alias: If the stationary tracker reports home, or all report away
      if:
      - condition: template
        value_template: "{{ trigger.to_state.state in ['home','on'] }}"
        alias: Home comming trigger
      then:
      - action: device_tracker.see
        data:
          dev_id: '{{composite_name}}'
          location_name: home
        alias: Publish home
      else:
      - alias: If Leaving was reported by the last stationary tracker
        if:
        - condition: template
          value_template: >
            {{ expand(input_trackers) 
              |rejectattr('attributes.latitude','defined') 
              |rejectattr('attributes.longitude','defined') 
              |selectattr('state','in',['home','on'])|list|count == 0 }}
          alias: Away was triggered by the last stationary tracker
        then:
        - variables:
            old_state: '{{ states(composite_tracker) }}'
            away_state: >
             {{ old_state if (old_state not in ['home','unknown','unavailable'])
                else 'not_home' }} 
        - action: device_tracker.see
          data:
            dev_id: '{{composite_name}}'
            location_name: '{{ away_state }}'
          alias: Publish away
trigger_variables:
  nice_name: !input composite_name
  composite_name: '{{ nice_name|slugify }}'
  composite_tracker: "{{ 'device_tracker.'~composite_name }}"
  input_trackers: !input input_trackers
  trigger_at_startup: !input trigger_at_startup
mode: queued
trace:
  stored_traces: 20
max: 10