Connection issue with Raspberry Pi

[CodeWithBishal]

I have a Raspberry Pi device with hotspot setup and no internet connection, and I have a webserver setup in the Raspberry Pi device and to communicate(send/receive) data from that RPi device I am using flutter app. The mobile device and the raspberry pi needs to be in the same network to transfer data, now I am trying to connect to the RPi device's hotspot from flutter using WiFi IoT plugin.

But If I use "useInternet" flag of the plugin to False, it does not connect to the RPi, with "useInternet" set to True, it connects but for some reason data can't be transmitted and I get a no internet error in the mobile app and hence the app is not able to communicate with the server.