QTI Neon

QTI Neon is a minimal, game-agnostic, relay-based UDP multiplayer protocol library. Clients never communicate directly. The relay routes packets by destination ID in the packet header, keeping NAT traversal trivial and host addresses private. The host is just another participant — it has no special network position, only a special protocol role. Neon features: - Relay-mediated UDP with automatic NAT traversal - Connection handshake with host-assigned client IDs and session tokens - Token-based reconnection (5-minute window by default) - Opt-in reliable delivery with retransmit and duplicate detection - Per-source rate limiting (100 pps default) - Auto-ping keepalive - Optional DTLS 1.2/1.3 encryption — relay-terminated, transparent to game code - Zero game-specific logic in the relay or library

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