Self-Hosted Main

If I am understanding your question correctly, tailscale has that built in. Look into "tailnet lock".

Tailscale?

Maybe with wireguard and some scripting? But I haven't heard of anything like this.

Setup otp auth, and do people connecting ask you the code.

In NetMaker and WG-easy the admin has to create and send the connection link, and can kick them at any point

Firezone can be helpful for this

Not exactly clear what you mean.

But to use Jellyfin on a SmartTV through Tailscale you can simply use a device that runs as Tailscale subnet router and correctly set up the routes.

Firezone should do what you want.

don't know if it's exactly what you're looking for:

zerotier needs you (as the admin) to approve a new client that tries to join a network.

I'm a smidge confused on what you are trying to achieve and how you think it will work.

As I understand you, you want to connect "embedded" devices where you do not control the software to a VPN network?

VPNs do need some kind of client (otherwise how does the network stack know to use the VPN protocol?) so how do you envisage this working without an app?

What is your desired topology like? Do you just want your smart TV/etc to connect to a remote media library over a VPN? If that's the case, then you are overthinking it with approvals etc.

You can achieve most of what you want with router configuration. Just define routes saying "Traffic from IP address 10.20.30.40 (TV) should go to 10.20.30.30 (gateway)" and then have the "gateway" handle the tunnel.

You can also look at tailscale's subnet routing (should work with headscale backend too).

Good luck.

ZeroTier does this, and it’s self hosted. Yay

keep eyeing it, I'm also interested!