LDN Application Data (Pia)

The application data field allows the host of an LDN network to encode game-specific information into the advertisement frame. This page describes how the application data is structured in games that use the Pia framework.

The application data starts with a short header, which is followed by game-specific application data.

5.2 - 5.7:

Offset	Size	Description
0x0	4	Session id (random)
0x4	4	CRC32 of user password
0x8	1	System communication version
0x9	3	Padding
0xC	8	Always 0
0x14		Application data

5.9 - 5.18:

Offset	Size	Description
0x0	4	Session id (random)
0x4	4	CRC32 of user password
0x8	1	System communication version
0x9	1	Header size (24)
0xA	2	Padding
0xC	4	Session param (random)
0x10	8	Always 0
0x18		Application data

5.39:

Offset	Size	Description
0x0	4	Session id (random)
0x4	4	CRC32 of user password
0x8	1	System communication version
0x9	1	Header size (16)
0xA	2	Padding
0xC	4	Session param (random)
0x10		Application data

System Communication Version

Version	Pia Version
1	5.2 - 5.7
2	5.9
3	5.10
4	5.11 - 5.17
5	5.18
8	5.39

Application Data

The application data depends on the game:

• Mario Kart 8 Deluxe
• Super Mario Maker 2

Mario Kart 8 Deluxe

Offset	Size	Description
0x0	1	Unknown
0x1	33	Nickname
0x22	2	Padding
0x24	88	Mii info
0x7C	4	Unknown

Super Mario Maker 2

Offset	Size	Description
0x0	8	Network service account id
0x8	11x2	Nickname (wide chars)
0x1E	2	Padding
0x20	88	Mii info
0x78	16	Unknown