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ryu_ldn_nx

Using the Overlay

Using the Overlay

Section titled “Using the Overlay”

ryu_ldn_nx includes a Tesla overlay that lets you monitor connection status and change settings without leaving your game. The overlay communicates with the sysmodule via a custom IPC service (ryu:cfg).

Requirements

Section titled “Requirements”
  • Tesla Menu (nx-ovlloader) must be installed
  • The overlay file must be in switch/.overlays/

Opening the Overlay

Section titled “Opening the Overlay”
  1. Hold L + DPad Down + Right Stick Click simultaneously
  2. Tesla Menu will appear
  3. Select ryu_ldn_nx from the list

Interface

Section titled “Interface”

The overlay displays three sections, all powered by the ryu:cfg IPC service (see IPC Commands):

Status

Section titled “Status”

| Item | Description | |------|-------------| | Server Status | Connection state (Disconnected, Connecting, Connected, Ready, Error) | | LDN State | Current CommState (None, Initialized, AccessPoint, AccessPointCreated, Station, StationConnected) | | Session | Current session info (player count, max players, local node ID, host/client) | | Latency | Round-trip time to server in milliseconds | | Game Active | Whether a game is currently using LDN |

Server

Section titled “Server”

| Item | Description | |------|-------------| | Server | Current server address and port | | Force Reconnect | Press A to disconnect and reconnect to the server |

Settings

Section titled “Settings”

| Item | Description | |------|-------------| | LDN Enabled | Toggle LDN emulation on/off | | P2P Proxy | Enable or disable P2P proxy (relay-only when disabled) | | Debug Logging | Toggle debug output on/off | | Log Level | Set log verbosity (0=errors, 1=warnings, 2=info, 3=verbose) | | Log to File | Enable/disable file logging | | Save Config | Persist current settings to SD card |

Status Colors

Section titled “Status Colors”

The server status uses color coding:

  • Green — Connected and ready
  • Yellow — Connecting or handshaking
  • Gray — Disconnected
  • Red — Error state

How It Works

Section titled “How It Works”

The overlay talks to the sysmodule through ryu:cfg, a custom IPC service obtained via command 65000 on the MITM’d ldn:u service. The IPC stubs are in overlay/source/ryu_ldn_ipc.c.

LdnSharedState bridges the LDN MITM and config service, allowing the overlay to read real-time state (connection status, LDN state, session info, RTT) without interfering with the game’s LDN session.

Automatic Updates

Section titled “Automatic Updates”

The overlay updates automatically every second while open. You can also:

  • Press R to force an immediate refresh
  • Status updates in real-time as you play

Common Actions

Section titled “Common Actions”

Check Connection Before Playing

Section titled “Check Connection Before Playing”
  1. Open overlay before starting a game
  2. Verify status shows “Ready” (green)
  3. Close overlay and start your game

Reconnect After Network Issue

Section titled “Reconnect After Network Issue”
  1. Open overlay
  2. If status shows “Disconnected” or “Error”
  3. Select “Force Reconnect” and press A
  4. Wait for status to become “Ready”

Switch Between P2P and Relay Mode

Section titled “Switch Between P2P and Relay Mode”
  1. Open overlay
  2. Toggle “P2P Proxy” on or off
  3. P2P enabled: direct peer connections via UPnP (lower latency, needs port forwarding)
  4. P2P disabled: all traffic relayed through server (more reliable, higher latency)

Monitor During Gameplay

Section titled “Monitor During Gameplay”
  1. Open overlay during gameplay
  2. Check “Session” for player count
  3. Check “Latency” for connection quality
  4. Close overlay to continue playing

Troubleshooting

Section titled “Troubleshooting”

Overlay Not Appearing

Section titled “Overlay Not Appearing”
  • Make sure Tesla Menu is installed correctly
  • Check that ryu_ldn_nx_overlay.ovl is in switch/.overlays/
  • Try reinstalling Tesla Menu

”ryu_ldn_nx not loaded”

Section titled “”ryu_ldn_nx not loaded””

This appears when the sysmodule isn’t running:

  • Verify sysmodule files are in the correct location: 
    atmosphere/contents/4200000000000010/exefs.nsp
    atmosphere/contents/4200000000000010/main.npdm
    atmosphere/contents/4200000000000010/toolbox.json
    atmosphere/contents/4200000000000010/flags/boot2.flag
  • Reboot your Switch
  • Check Atmosphere is working properly

Status Stuck on “Connecting”

Section titled “Status Stuck on “Connecting””
  • Check your WiFi connection
  • Verify the server is online
  • Try “Force Reconnect”
  • Check server address in config/ryu_ldn_nx/config.ini