NAT Traversal Protocol (Pia) - RainMz/NintendoClients GitHub Wiki
Up to Pia version 5.10, the protocol port was used to determine the message type.
In Pia version 5.11 and later, all packets are sent through port 0 and always contain the NatProbeData structure.
The following version numbers are advertised during the connection request:
| Pia version |
Version |
| 5.19 - 5.43 |
0 |
Probe request
Probe reply
Dummy packet
| Offset |
Size |
Description |
| 0x0 |
5 |
"Dummy" |
NatProbeData
| Offset |
Size |
Description |
| 0x0 |
4 |
Service variable id |
| 0x4 |
1 |
Probe type (0=request 1=reply, 255=dummy) |
| 0x5 |
3 |
Padding |
| 0x8 |
8 |
System time (OSGetSystemTime on Wii U, nn::os::GetSystemTick on Switch) |
5.11 - 5.43: