This will send a message when someone in your known devices list connects to your local network. In other words, when someone arrives home. It will only work if you are using the nmap device tracker or a similar component.
This example uses Telegram to send the notification.
notify: - name: Telegram platform: telegram api_key: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx chat_id: xxxxxxxxx
Add the automation rule. Change
device_name_here to match the device you want to track.
automation: trigger: platform: state entity_id: device_tracker.device_name_here from: 'not_home' to: 'home' action: service: notify.Telegram data: message: 'Person is now home'