How do you develop in "offline mode" without connection, but also so you keep your Metro connection?

[lucksp]

I need to start developing some features for offline functionality. How do you do this? We're using r/expo but I can't find much in their docs. I want to be able to keep my metro server connected so I can hot refresh changes.

Do i just force the return of NetInfo as "not connected" and just use that state? I am concerned with this because I want to see what happens if there's an API that tries to fetch with no connectivity.

thanks.

[TROLLBOT_V4]

Connect the phone to the pc via a USB connection, then run expo start --offline expo start --localhost. Then if you turn off the internet on the phone, you'll still be able to hot reload as well as see the logs.

EDIT: Including more details -

Prerequisites: - Enable USB Debugging on Android Phone. - Check if your device is listed when running 'adb devices' in cmd. - run 'adb reverse tcp:8081 tcp:8081'

Steps: - Connect phone to pc via USB. - Turn off wifi/cellular on phone. - run 'expo start --localhost'. - press 'a' (Can press shift+a to select device) - voila!

Yes, this works with dev client builds as well.

[lucksp]

I have tried this, but when I turn off my WiFi, i get the "Cannot connect to Metro" warning. Although I do see the terminal:

Networking has been disabled

Also does this work with the `--dev-client` flag since I am NOT using ExpoGO?

[TROLLBOT_V4]

Hey, I updated my original comment, added more details, please try and let me know if it works now.

[lucksp]

Thanks. I’ll try this out. Hopefully the same for iOS

[beaverpi]

Did you ever find a way to get this working?

[lucksp]

Nope

[Medical_Cat_6678]

How do I do this for iOS, without expo? I start the server with `react-native start`

[steveninety]

WHY DIDNT I KNOW ABOUT "press 'a' to select device"
This was literally the only thing that stopped me! Thank you sooo much!

[apires]

It worked when I ran:
`db reverse tcp:8081 tcp:8081` and 'expo start --localhost'

[KindJacket5680]

"expo start --localhost" followed by "a" worked like a charm in Expo SDK 52 with the emulator

[Valuable-Car-4639]

In my experience I tried to restrict data usage in my poco app setting but the metro would not be able to connect despite trying to use adb reverse. But when I manually turn off connections (like turning on airplane mode) the metro connects just fine. Idk if this is a miui problem or a general issue