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Opening it the first time

1. Open the downloaded file and drag Obdaryn to Applications.
2. Open Obdaryn. macOS says it can't check the app for malicious software. Click Done.
3. Open System Settings → Privacy & Security. Under Security, next to “Obdaryn was blocked”, click Open Anyway, then confirm with your password.
4. When you connect for the first time, allow Obdaryn to find devices on your local network. That's how it reaches the adapter.

Apple only notarizes apps from members of its paid developer programme. Obdaryn isn't notarized yet. Its source code is public: you can read it, or build the app yourself.

Then, at the car

Plug in the adapter, turn the ignition on, join the adapter's Wi-Fi and press Connect. The full guide

Early access: not yet tested on a real car.