How to build a route to an OpenVPN server?

Question

openvpn

Good afternoon!
There is an OpenVPN server on Ubuntu Server with address 192.168.0.100 (address in tunnel 10.15.0.1)
Client on Android smartphone with address 192.168.43.1 (address in tunnel 10.15.0.13)
I want to access the server from laptop (192.168.43.101), which climbs the Internet through an access point created by a smartphone.
It is not yet possible to generate a separate key for the laptop.

Answer 1

Add a route to the network 10.15.0.0/24 on the laptop via the IP of the smartphone. In addition, on the server, in the OpenVPN settings, you need to specify that behind this client (smartphone) there is a network 192.168.43.0, otherwise the answers will not come to the laptop.