Here is some basic documentation for the protocol that ROTT uses to communicate between the client and server for COMM-BAT. This information is sourced from the GPLv2 source code provided by Apogee Software on December 20th 2002. All values shown are assumed to be in little-endian byte order.

Simple Types

• [U8] - Unsigned 8-bit integer (unsigned char)
• [U16] - Unsigned 16-bit integer (unsigned short)
• [I16] - Signed 16-bit integer (signed short)
• [U32] - Unsigned 32-bit integer (unsigned int)
• [I32] - Signed 32-bit integer (signed int)
• [STR] - String with ASCII encoding (char)

Complex Types

DESC

Data Type	Description
U8	Character
U8	Uniform Color
STR	Codename (9 bytes)

SPECIALS

Data Type	Description
I32	God Mode Time
I32	Dog Mode Time
I32	Shrooms Mode Time
I32	Elasto Mode Time
I32	Asbestos Vest Time
I32	Bullet Proof Vest Time
I32	Gas Mask Time
I32	Mercury Mode Time
I32	God Mode Respawn Time
I32	Dog Mode Respawn Time
I32	Shrooms Mode Respawn Time
I32	Elasto Mode Respawn Time
I32	Asbestos Vest Respawn Time
I32	Bullet Proof Vest Respawn Time
I32	Gas Mask Respawn Time
I32	Mercury Mode Respawn Time

BATTLETYPE

Data Type	Description
U32	Gravity
U32	Speed
U32	Ammo
U32	Hit Points
U32	Spawn Dangers
U32	Spawn Health
U32	Spawn Weapons
U32	Spawn Mines
U32	Respawn Items
U32	Weapon Persistence
U32	Random Weapons
U32	Friendly Fire
U32	Light Level
I32	Kills
I32	Danger Damage
U32	Time Limit
U32	Respawn Time

Packet Structure

Packets always start with a U8 value defining its type. This allows for 256 possible packet types. Packets have a maximum size of 2048 bytes.

Packet types

0x01 | Movement Queue

Data Type	Description
U8	Packet Type
I32	Packet Time
I16	X Velocity
I16	Y Velocity
U16	Z Height (absolute?)
U16	Player Button State

0x02 | Request Packets

Data Type	Description
U8	Packet Type
I32	Packet Time
U8	Number of Packets

0x03 | Fixup Packets

Data Type	Description
U8	Packet Type
I32	Packet Time
U8	Number of Packets
*	Packet Data

0x04 | Text

Data Type	Description
U8	Packet Type
I32	Packet Time
U8	Destination Player
STR	Text (33 bytes)

0x05 | Pause Game

Data Type	Description
U8	Packet Type
I32	Packet Time

0x06 | Quit Game

Data Type	Description
U8	Packet Type
I32	Packet Time

0x07 | Sync Time

Data Type	Description
U8	Packet Type
I32	Sync Time

0x08 | Remote Ridicule

Data Type	Description
U8	Packet Type
I32	Packet Time
U8	Source Player
U8	Unknown
U8	Destination Player

0x0A | Respawn

Data Type	Description
U8	Packet Type
I32	Packet Time

0x0B | Unpause Game

Data Type	Description
U8	Packet Type
I32	Packet Time

0x0C | Server Data

Data Type	Description
U8	Packet Type
I32	Packet Time
U8	Number of Packets
*	Packet Data

0x0F | Game Description

Data Type	Description
U8	Packet Type
U8	Player ID
U8	Violence Level
U8	Product ID
U32	Game Version
DESC	Player Description

0x10 | Game Play

Data Type	Description
U8	Packet Type
*	Dummy Data (20 bytes)

0x11 | Game Master

Data Type	Description
U8	Packet Type
U8	Level Number
U16	Map CRC
U8	Violence Level
U8	Product ID
U8	Mode
U32	Game Version
U8	Teamplay
SPECIALS	Specials Times
BATTLETYPE	Battle Mode Options
STR	Level Filename (20 bytes)
I32	Random Seed
U8	Ludicrous Gibs
DESC[]	Array of Player Descriptions (11 if registered, 5 if shareware).

0x12 | Game Acknowledgement

Data Type	Description
U8	Packet Type
U8	Player ID

0x13 | Game End

Data Type	Description
U8	Packet Type
I32	Packet Time

0x13 | Sync Time

Data Type	Description
U8	Packet Type
I32	Sync Time

0x16 | Movement Queue and Sound

Data Type	Description
U8	Packet Type
I32	Packet Time
I16	X Velocity
I16	Y Velocity
U16	Z Height (absolute?)
U16	Player Button State
U8	Sound Packet Type
*	Sound Data (256 bytes)

0x17 | Exit Game

Data Type	Description
U8	Packet Type
I32	Packet Time

0x18 | Game End

Data Type	Description
U8	Packet Type
I32	Packet Time

0x19 | Null Movement Queue

Data Type	Description
U8	Packet Type
I32	Packet Time