HA automation for a router/modem watchdog

automation-router-watchdog.yaml

alias: "[Tech] Router Watchdog"
mode: single
trigger:
  - platform: state
    entity_id:
      - binary_sensor.ping_udm_ipv4
    to: "off"
    for:
      minutes: 15
condition:
  - condition: state
    entity_id: binary_sensor.ping_cloudflare_dns_ipv4
    state: "off"
  - condition: state
    entity_id: binary_sensor.ping_aussie_dns_ipv4
    state: "off"
action:
  - repeat:
      until:
        - condition: state
          entity_id: binary_sensor.ping_udm_ipv4
          state: "on"
      sequence:
        - service: switch.turn_off
          target:
            entity_id: switch.udm_power
        - delay:
            seconds: 5
        - service: switch.turn_on
          target:
            entity_id: switch.udm_power
        - wait_for_trigger:
            - platform: state
              entity_id:
                - binary_sensor.ping_udm_ipv4
              to: "on"
          timeout:
            hours: 2
        - if:
            - condition: template
              value_template: "{{ repeat.index >= 10 }}"
          then:
            - stop: >-
                Abandoning after too many attempts, so we don't completely break
                or corrupt the device.
  - wait_for_trigger:
      - platform: state
        entity_id:
          - binary_sensor.ping_cloudflare_dns_ipv4
          - binary_sensor.ping_aussie_dns_ipv4
        to: "on"
    timeout:
      minutes: 5
  - service: notify.everyone
    data:
      title: 🐶 Router Watchdog
      message: Router is back online thanks to the watchdog power cycling it.