blueprint:
  name: Synchronize states
  description: Synchronize the on/off state of 2 entities
  domain: automation
  input:
    entity_1:
      name: First entity
      selector:
        entity: {}
    entity_2:
      name: Second entity
      selector:
        entity: {}
  source_url: https://community.home-assistant.io/t/synchronize-the-on-off-state-of-2-entities/259010
mode: restart
max_exceeded: silent
variables:
  entity_1: !input entity_1
  entity_2: !input entity_2
trigger:
- platform: state
  entity_id: !input entity_1
  to:
  - 'off'
  - 'on'
- platform: state
  entity_id: !input entity_2
  to:
  - 'off'
  - 'on'
condition:
- condition: template
  value_template: '{{ states(entity_1) != states(entity_2) }}'
- condition: template
  value_template: '{{ trigger.to_state.state != trigger.from_state.state }}'
- condition: template
  value_template: '{{ trigger.to_state.context.parent_id is none or (trigger.to_state.context.id
    != this.context.id and trigger.to_state.context.parent_id != this.context.id)
    }}'
action:
- service: homeassistant.turn_{{ trigger.to_state.state }}
  data:
    entity_id: '{% if trigger.from_state.entity_id == entity_1 %} {{ entity_2 }} {%
      else %} {{ entity_1 }} {% endif %}'