Server Packets

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Packets the server sends to the client, and thus packets the server needs to simulate.
Lengths that begin with a "→" denote to add the length of the last field to the offset.
This is necessary for variable length fields.

0x11 - 0x1 "Login Response Packet"

Packet Structure

Position	Field	Type	Notes
0x0	Packet Header	Packet Header	Possible flags: 0x0 and 0x0
0x8	Unknown	uint8	No Notes
0x9	Unknown	uint8[3]	No Notes
0xC	String Magic	uint32	Sub 0xB6, Xor 0x8BA4
0x10	UTF-16 String	PSO2 String	Login error message. May be blank in case of successful login.
→0x0	Unknown	uint8[0xC]	No Notes
→0xC	UTF-16 String	char16[0x20]	Fixed-length block name.
→0x4C	Unknown	float32[0x2C]	0xB0 bytes long. A block of floating-point numbers whose purpose is unknown.
→0xFC	Unknown	uint8[0xC]	No Notes
This packet is sent to the client following a successful or failed login attempt.

0x11 - 0x2C "Ship Block Packet"

Packet Structure

Position	Field	Type	Notes
0x0	Packet Header	Packet Header	Possible flags: 0x0 and 0x0
0x8	Zeros	uint8[0x5C]	SEGA's server fills this with data, but the client ignores it all.
0x64	IP Address	uint8[0x4]	No Notes
0x68	Ship Port	uint16	No Notes

0x3 - 0x8 "Ship "Hello" Packet"

Packet Structure

Position	Field	Type	Notes
0x0	Packet Header	Packet Header	Possible flags: 0x0 and 0x0
0x8	Protocol Version		uint16
0xA	Block Code	uint16	Block code is the 100 * Ship Number + Block Number (Eg, Block 5 ship 2 is 205)
0xC	Padding / Unknown	uint8[0x4]	Unknown or unused.

0x19 - 0x1 "System Message Packet"

Packet Structure

Position	Field	Type	Notes
0x0	Packet Header	Packet Header	Possible flags: 0x0 and 0x0
0x8	String Magic	uint32	Sub 0xA2, Xor 0x78F7
0xC	UTF-16 String	PSO2 String	No Notes
→0x0	Message Type	uint32	See message types below. Placed after the string.
Possible message types:

0x0 - Golden Ticker
0x1 - Administrator Message dialog that won't close for ~5 seconds.
0x2 - Administrator Message dialog that can close instantly.
0x3 - "System Message" in the chat log.
0x4 - Generic Message dialog box.

Any other value will trigger like 0x4.