InputRedirectionClient

A cross-platform input redirection client for Nintendo 3DS, rewritten in Rust.

Captures gamepad input (buttons, analog sticks) and touch screen events, then sends them over UDP to a 3DS running InputRedirection custom firmware.

Features

• Full 3DS input support: buttons, circle pad, C-stick, touch screen, Home/Power
• Configurable button remapping (19 mappable buttons)
• Touch screen with mouse input and 2 preset shortcut buttons
• A/B and X/Y swap toggles
• Y-axis inversion for analog sticks
• Persistent TOML configuration
• Multi-gamepad support (all connected controllers merged)
• 20 Hz polling (50ms tick)

Requirements

• A Nintendo 3DS with InputRedirection enabled
• A gamepad connected to your PC

Installation

Pre-built binaries

Download the latest release from the Releases page.

Platform	Archive
Linux x86_64	input-redirection-client-linux-x86_64.tar.gz
macOS ARM64	input-redirection-client-macos-arm64.tar.gz
Windows x86_64	input-redirection-client-windows-x86_64.zip

Build from source

# Linux: install system dependencies first
sudo apt-get install libxkbcommon-dev libwayland-dev libfontconfig1-dev libudev-dev

# Build
cargo build --release

The binary will be at target/release/input-redirection-client-rs.

Usage

1. Launch the application
2. Enter your 3DS IP address in the Main tab
3. Connect a gamepad — inputs are sent automatically
4. Use the Touch Screen tab for touch input via mouse
5. Use the Button Config tab to remap buttons and configure touch presets

Architecture

Clean architecture with SOLID principles:

src/
├── main.rs                  # Entry point, dependency wiring
├── domain/                  # Pure business logic (no external deps)
│   ├── models.rs            # Data structures, enums, config
│   ├── input_mapper.rs      # Button mapping, coordinate transforms
│   └── protocol.rs          # 3DS HID frame encoding (20-byte UDP)
├── ports/                   # Trait definitions (interfaces)
│   ├── gamepad_port.rs      # GamepadPort trait
│   ├── network_port.rs      # NetworkPort trait
│   └── settings_port.rs     # SettingsPort trait
├── infrastructure/          # External I/O implementations
│   ├── gamepad_adapter.rs   # gilrs wrapper
│   ├── network_sender.rs    # UDP socket sender
│   └── settings_store.rs    # TOML file persistence
├── application/             # Use case orchestration
│   ├── input_service.rs     # Poll → map → encode → send
│   └── config_service.rs    # Load/save settings
└── ui/
    ├── app.slint            # Slint UI definition
    └── bridge.rs            # UI ↔ application bridge

Protocol

Sends 20-byte little-endian UDP datagrams to port 4950:

Offset	Field	Description
0-3	hidPad	Button bitmask (active-low, 12-bit)
4-7	touchScreenState	Touch coordinates + pressed flag
8-11	circlePadState	Left stick (12-bit X/Y)
12-15	cppState	Right stick with 45° rotation (8-bit) + ZL/ZR
16-19	interfaceButtons	Home, Power, Power Long

License

Based on the original InputRedirectionClient-Qt by TuxSH.