/? STUN: https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...

There is a Native Sockets spec draft that only Chrome implements;

"Direct Sockets API": https://developer.chrome.com/docs/iwa/direct-sockets :

> The Direct Sockets API addresses this limitation by enabling Isolated Web Apps (IWAs) to establish direct TCP and UDP connections without a relay server. With IWAs, thanks to additional security measures—such as strict Content Security Policy (CSP) and cross-origin isolation— this API can be safely exposed.

Though there's UPNP XML, it lacks auth for port forwarding permissions. There's also IPV6.

Similar: "Breaking the QR Limit: The Discovery of a Serverless WebRTC Protocol – Magarcia" https://news.ycombinator.com/item?id=46829296 re: Quick Share, Wi-Fi Direct, Wi-Fi Aware, BLE Beacons, BSSIDs and the Geolocation API