Rust Implementation of the OpenScreen Protocol

Disclaimer

This is an unofficial, experimental prototype and is NOT a production-ready implementation. The protocol itself is still under development by the W3C, and this code is not supported by any organization.

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An early draft prototype Rust no_std implementation of the W3C OpenScreen Protocol.

Overview

This project is an exploration of the W3C OpenScreen protocol, implemented in Rust with a focus on a no_std and Sans-IO architecture.

• Core Logic: The core crates are no_std and use a Sans-IO design, making them suitable for embedded systems and adaptable to any runtime.
• Protocol Compliance: Aims to follow the W3C OpenScreen Protocol specification for SPAKE2 authentication, QUIC transport, and mDNS discovery.
• Cross-Platform: The binaries have been verified on macOS and Linux. The core crates are designed to be platform-agnostic.

Current Status: This is a minimally working prototype and is under active development.

Project Structure

The protocol is implemented as a series of composable crates:

openscreen-application/       # W3C Application Protocol (main entry point)
    ↑
openscreen-network/           # W3C Network Protocol (SPAKE2 auth)
    ↑
openscreen-quinn/             # QUIC adapter (runtime integration)
    ↑
openscreen-discovery-mdns/    # mDNS service discovery

Quick Start

Build and Run

# Build the project
cargo build --workspace

# Terminal 1: Start receiver
cargo run --bin app-receiver --  --psk test-psk

# Terminal 2: Start sender (auto-discovers receiver)
cargo run --bin app-sender -- --psk test-psk

Run Tests

cargo test --workspace

References

• W3C OpenScreen Network Protocol
• Chromium OpenScreen Implementation
• W3C OpenScreen Protocol Repository

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License

Apache-2.0