Hello!
We post the reply to your ticket by the support team for the reader's comfort.
====
Hello and thank you for your choice!
We do not think that the problem can be approached and resolved through OpenVPN configuration files. We would consider policy based routing on the router. In this way you can configure each specific device behind the router to have its traffic routed through the proper tun interface or even through the WAN (outside the VPN, therefore). Please check the documentation.
An overview of the Policy Based Routing (PBR) utility:
https://openwrt.org/docs/guide-user/network/routing/pbr
A specific approach to achieve the setup:
https://search.brave.com/search?q=openwrt+policy+routing+for+multiple+OpenVPN+client+connections&summary=1&conversation=f943dbcf532434cd689c65
Kind regards
AirVPN Support Team
====
Kind regards