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The host and port for the debug server in react-native applications can be set automatically by running the command "adb reverse tcp:8081 tcp:8081" in the terminal/command prompt. This command allows the device to access the local development server running at port 8081 on the host machine.
Additionally, the React Native CLI provides the command "react-native start" which starts the debug server and automatically sets the host and port. It also ensures that the device can access the server using the correct IP address.
Another approach is to use tools like ngrok or Localtunnel to expose the local development server to the internet and provide a public URL that the device can use to connect. These tools also handle setting the host and port automatically.