Add device limit feature for subscriptions (HWID-based)

[Azazel-h]

Is your feature request related to a problem? Please describe.
Many services offer subscriptions limited not by traffic, but by the number of devices. This feature doesn't work with all client apps, but it's popular for small proxy businesses or for people who want to offer unlimited traffic to friends without allowing them to share access widely.

Describe the solution you'd like
As far as I know, Remnawave uses HWID to limit devices connected to a subscription. Add a field for maximum device count and a list of currently connected devices (or all-time devices) visible to the admin. Restrict connecting moree than the limit.

Describe alternatives you've considered
Simultaneous IP usage detection, but that seems much more difficult to implement.

[Zhaokix]

[bigorado]

This issue is very relevant, and I think many would be grateful for this implementation in the panel. Currently, there's a parameter in env that can be set to supposedly limit the number of restrictions, but it doesn't work.

[Murcklack]

I really miss the native IP connection limit. I had to configure fail2ban manually.

It would be great to see this feature alongside traffic limits and subscription dates.

[lie-must-die]

I really miss the native IP connection limit. I had to configure fail2ban manually.

It would be great to see this feature alongside traffic limits and subscription dates.

Have you been able to implement a limit on the number of connected devices to a specific subscription host? How did you do it?

[lie-must-die]

This is a great idea, and I think it should definitely be implemented. However, it will only protect you from the possibility of sharing your subscription. If a person shares a specific host configuration from a subscription, other people will still be able to use the vpn. Therefore, we need to figure out how to limit not only the number of devices in the subscription, but also the number of devices connected to the subscription host.