OpenVPN works as it works in any system... It makes tunnel to server or point to point tunnel and adds and replaces routes...

Connman does make it harder because you can't replace default route and DNS as easily as you normally would. And when phone changes it's connection from wlan to mobile you need to restart the VPN connection.

The reason for not opening my app yet is that it's my first app in any platform and for that reason code is very messy...