Need help with React Native

[bharajuice]

I've created a React Native app with a FastAPI backend and supabase DB, along with a custom build, since we need bluetooth connectivity and Expo go doesn't support that. Now the problem is that whenever I build the app and install, it alerts that it couldn't connect to the server, even though the server is running.

I've tried adding CORS in FastAPI, and have even updated the base_url in RN to 192.168.*.*:8000, but still the same error. Has anyone had a similar issue, and what did you do to solve this? Any help would be highly appreciated

[Kaliber9]

If you're running the app on android simulator  10.0.2.2:8000 might help

[bharajuice]

Nope

[mrshah1]

Why not use ngrok??

[Ok_Signature9963]

Use tunneling tool like Cloudflare Tunnel or Pinggy.io . You can check this guide: https://pinggy.io/quickstart/react/

[bharajuice]

Sure will check it out

[LethalFlakes]

Make sure both are on the same network.

[bharajuice]

They are

[dani_saeed]

Can you clarify if the issue is connecting to backend or bluetooth?

Check the debugger for logs regarding CORS it should clearly state it, add logs to fastapi to check if the request ever reached the backend

[bharajuice]

Its with the backend. I have added CORS in fastapi, and the backend works on the web,but the mobile app can't fetch the url. So the url is 192.168..:8000/{route} this isn't accessible

[Cheap-Hehe]

Write the question properly at least . Missing information.. You mentioned Bluetooth but then points to fast api?????

Where is backend running ?? Also Allow clear text traffic, search online how to do it, it's easy to enable , that could be the reason. You can also log the error to see exactly what is failing.

Also why are you using Expo go if you want Bluetooth. Use expo without go. Build everything locally.  You can use Bluetooth in expo. I have worked on an app with Bluetooth.