react native debug server host & port for device
Open the command prompt and type ipconfig to find your machine's IP address (more info). Make sure your laptop and your phone are on the same Wi-Fi network. Open your React Native app on your device. You'll see a red screen with an error. This is OK. The following steps will fix that. Open the in-app Developer menu. Go to Dev Settings → Debug server host & port for device. Type in your machine's IP address and the port of the local dev server (e.g. 10.0.1.1:8081). Go back to the Developer menu and select Reload JS. You can now enable Live reloading from the Developer menu. Your app will reload whenever your JavaScript code has changed