OpenTTDDevBlackBook/Network/UDP

OpenTTD Development Documentation

HAL (Hardware Abstraction Layer)

Audio
Music
Graphic

Window System

Using the Window System
Events used by the Window System
Colour codes that exist in OpenTTD
Adding a text box
Understanding the widget focus system

Patches

HOWTO - Add a patch option
HOWTO - Add a squirrel function
HOWTO - Do a savegame BUMP

The Map / Scenario

Understanding the Dynamic Landscape Array
Understanding the SaveGame Handler
HOWTO - Create good Scenarios
HOWTO - Add New Town Name Generators

The actual simulation

Vehicles
Using Orders
Pathfinding
Ratings
Train Acceleration

Language and Strings

Format of langfiles
Using OpenTTD Strings
List of Special Strings

Multiplayer

The Core Interface

Starting a Server

Connecting to a Server

Using the list of LAN/Internet Games

The OpenTTD TCP Protocol
The OpenTTD UDP Protocol
HOWTO - Debug desyncs

Ingame Console

The Console Window
Using Console Scripting
HOWTO - Add Functions/Commands to the Console
HOWTO - Add Variables to the Console
HOWTO - Direct Variable Access using ICONSOLE_VAR_POINTER
OpenTTD Console Commands
OpenTTD Console Variables
Development History

Open TTD Network Protocol - UDP

Packet List

The packet list is ordered in the same way as PacletUDPType enum from network/core/udp.h

Packet name	Sent by	Purpose
PACKET_UDP_CLIENT_FIND_SERVER	Client	Queries a game server for game information
PACKET_UDP_SERVER_RESPONSE	Server	Reply of the game server with game information
PACKET_UDP_CLIENT_DETAIL_INFO	Client	Queries a game server about details of the game, such as companies
PACKET_UDP_SERVER_DETAIL_INFO	Server	Reply of the game server about details of the game, such as companies
PACKET_UDP_SERVER_REGISTER	Server	Packet to register itself to the master server
PACKET_UDP_MASTER_ACK_REGISTER	Master Server	Packet indicating registration has succedeed
PACKET_UDP_CLIENT_GET_LIST	Client	Request for serverlist from master server
PACKET_UDP_MASTER_RESPONSE_LIST	Master Server	Response from master server with server ip's + port's
PACKET_UDP_SERVER_UNREGISTER	Server	Request to be removed from the server-list
PACKET_UDP_CLIENT_GET_NEWGRFS	Client	Requests the name for a list of GRFs (GRF_ID and MD5)
PACKET_UDP_SERVER_NEWGRFS	Server	Sends the list of NewGRF's requested.
PACKET_UDP_END	None	Must ALWAYS be on the end of this list!! (period)