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How to lock the car from your phone after an alert with Car Watch

After the car reports an open window or unlocked door, lock it from your phone or watch.

Authorization notice. Car Watch is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Credentials. This setup needs a Home Assistant login and a Tailscale mesh, so protect both accounts and the Pi's access to them.

Who it is forA car owner away from the car who gets a room alert about an open window or a door left unlocked.

The problemThe car can report a problem, but without a remote path you cannot act on it while away.

The outcomeThe car is locked from the phone or watch, and the room records the action.

What you need first

  • Raspberry Pi 5 with 16 GB RAM, as used for the measured numbers in the README
  • A microSD card with the car's owner's manual index and the local model files
  • A GroupMind room account for the car's agent, if you want room posts
  • Access to the car's own speakers and microphone for hands-free voice
  • Python 3 on the Pi, since the repo is Python with no pip dependencies

Steps

  1. Set up Tailscale on the Pi and on your Home Assistant machine using docs/remote-access.md in the repo.
  2. Confirm the Pi reaches Home Assistant at its Tailscale address from outside your home network.
  3. When the car posts an alert to the room, reply with the lock request from your phone or watch.
  4. Check the car's lock state in the room after the reply, using the cloud read.

Prompt for your agent

Using the CarWatch repo at https://github.com/ThinkOffApp/CarWatch and the setup in docs/remote-access.md, send a lock request to the car from <phone-or-watch> and report the lock state read back afterwards. Verify that the reported state is locked and that the request was made from outside the home network.

Caveat. The README says unlock, open and start are deliberately not implemented, so this use case only covers locking and closing a window.

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