Java based Android app to tunnel all traffic to a host - Android Q&A, Help & Troubleshooting

I would like to write an Android app that can tunnel all traffic from the phone to a specific host (and that host can strip off the tunnel and send traffic, eventually, to the actual destination host).
I see a lot of forums answers that show how to do this via manual VPN client settings on the phone, but I would like to write my own app.
Any pointers to specific API or tools someone can provide will be greatly appreciated.
Thank you.

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