If you’re only using Nostr while connected to your home network, you will always be able to broadcast to your private relay. Still, when you’re out of the range of your home WiFi or using a different connection to the one shared by your node, you will be disconnected from your private relay.

That is not to say you cannot read and write on Nostr. If you have other public or paid relays connected to your client, your posts will still be pulled or written to those relays instead, while your private relay cannot be reached. So moving away from your home network shouldn’t impact your Nostr experience, so feel free to Nostr from anywhere.

If you are not happy with the idea of being disconnected from your precious private relay or you want to give users access to your private relay but they don’t have local access by being connected to your WiFi, and you need to grant them remote access.

You can do that by leveraging another Umbrel app.

Go back to your Umbrel app store and install Tailscale. This app will allow you to create a VPN connection, and through that connection, you can access your private remotely.

Tailscale does offer a free account so that you can connect several of your devices without much extra expense. Still, if you’re planning to allow several people on your network, you will need to upgrade your account to a paid subscription to accommodate these additional connections.

Hope it helps !