Android - force network requests go through wifi instead of mobile network

Question

I have an app which connects to a hardware device Wi-Fi hotspot. It seems that Android forward requests over other networks (3G/4G for example) instead the hotspot, since my

Answer 1

Per the Connecting your App to a Wi-Fi Device blog post:

To direct all the network requests from your app to an external Wi-Fi device, call ConnectivityManager#setProcessDefaultNetwork on Lollipop devices, and on Marshmallow call ConnectivityManager#bindProcessToNetwork instead, which is a direct API replacement.