I have an alternative idea.
I use another Application (by k-szuster) on my router, where I can define Firewall rules. This is done by using a GUI on the router.
Each Firewall rule has a identifier. In my case: cfg0f92bd. This can be derived from the GUI, after one submits a so called ‘ticket’ to extend internet access in the firewall.
In the client.lua script, I am will try to create a command using that identifier.