Go to Dev Settings → Debug server host & port for device.You'll see a red screen with an error.Open your React Native app on your device.Make sure your laptop and your phone are on the same Wi-Fi network.
You can find the IP address in System Settings (or System Preferences) → Network. You'll need your development machine's current IP address before proceeding.
You'll first need to install the app on your device using a USB cable, but once that has been done you can debug wirelessly by following these instructions. You can also connect to the development server over Wi-Fi. Your app will reload whenever your JavaScript code has changed. You can now enable Live reloading from the Dev Menu.