How to automatically enable VPN client on Android 9?

Question

Android

Set up a VPN server, set up a standard VPN client on Android (PPTP). I use it when using mobile Internet. I noticed that he himself does not turn on when I switch to a mobile network and sometimes he turns off himself and this is not very obvious. As for the shutdown, I’ll clarify, maybe the server turns it off.

How to make it turn on easier and generally automatically when you start the mobile network? Maybe an application or better scripts that work in androyd.

I saw on some phones that VPN can be turned on from the curtain, but I didn’t find such a button ((((Maybe you know what applications that add such a button?

Redmi Note 6 pro
MIUI Global 11.0.5
Android 9

Answer 1

Is there a "permanent vpn" checkbox in the connection properties? or does it not fit?

Answer 2

It turns off because the Internet disappears on the bodies.
On iPhones, the same if the network is gone.
I don't know about automatic