From what I see, WebRTC is the key to achieve direct P2P connections.

I'm involved at NOSTR project where beyond internet the connections can be made with bluetooth, LoRa, LAN (including Wi-Fi) and radio using walkie-talkies.

This is great to hear. The part about Bluetooth/radio/LoRa sounds vaguely like Reticulum. I’ve always thought that the two projects could find alignment somewhere. Nostr with Reticulum style features, or even just Nostr over Reticulum, would be unstoppable.