2 potentials
ISP blocking Web hosting ports/traffic - often opt Out or flat out blocked for residential connections.
ISP using CGNAT so your "public ip" isn't really public? But you got this far so i would guess you already know that.
For reference, the cgnat "public ip range" should be 100.64.0.0 to 100.127.255.255
If you do have cgnat i think maybe cloudflare tunnels, tailscale or a vps are your solutions.
Google devices (so maybe apple ones as well) sometimes hard code the dns server so you need to redirect dns request to you local unbound instance with a firewall rule.
In short yes They all have their own key pair. Private and public Each client should know the "servers" public key. And the "server" should know the client's public key(s)
Open source hardware movement != Free open source hardware movement.
I'm not sure that many are advocating the free part mainly the open part.
Link it to openweb-ui makes things easier Then can knowledge it on say all the manuals in your house Or your home insurance policy or soemthing.
Link it to "speaches" and then you can make a voice chat.
Link it to continue.dev for coding
I think alot of the use case come from developing system prompts You can them make a "custom" model for specific tasks. I.e this model knows about my home insurance policy but writes back lile it's pirate with a stutter
Nothing useful but gets your toes wet.