OpenTTD Python Client

A high-performance, Object-Oriented Python client for OpenTTD servers, specifically optimized for JGR Patch Pack (JGRPP). This client handles the modern secure handshake, including X25519 PAKE authentication and AEAD stream encryption.

🚀 Features

• Secure Authentication: Full implementation of X25519 PAKE (Password-Authenticated Key Exchange).
• Stream Encryption: Automatic XChaCha20-Poly1305 authenticated encryption for all game traffic.
• Modular Design: Separates low-level binary protocol handling from high-level game logic.
• State Management: Handles the full join sequence including Map download and synchronization.
• Comprehensive Testing: Robustly tested with unit, logic, and E2E tests (including 100% coverage for unit/logic tests).
• Vehicle Listing: Query vehicle data via the Admin GameScript channel with list_vehicles().
• Vehicle Timetables: Read and modify a vehicle's timetable (change_timetable(), autofill_timetable(), set_timetable_start(), set_vehicle_on_time(), get_vehicle_timetable()) via real game-protocol commands.
• Authoritative Timetable Reads: OpenTTDAdminClient.get_timetable() fetches the real, current timetable of any vehicle from the running game (via a patched GameScript API + the AdminBridge GS) — no company join needed, works for timetables set before connecting.
• Station Listing: Enumerate stations via the Admin GameScript channel with list_stations().
• Station Cargo Snapshots: OpenTTDAdminClient.get_station() returns a station's live per-cargo state from the running game — both the real-time amount waiting and the planned flow through the cargodist link graph — over the AdminBridge GS (stock GameScript API, no server patch needed).
• Cargo Flow Breakdown: OpenTTDAdminClient.get_station_cargo() breaks one cargo type down by source station and next hop (routing destination) for both waiting (real-time) and planned amounts, with optional from_station/via_station filters.

🛠 Setup

Prerequisites

• Python 3.11+
• A running OpenTTD server (preferably JGRPP)

Installation

1. Create and activate a virtual environment:

   python3 -m venv venv
   source venv/bin/activate  # Linux/macOS
   

2. Install dependencies:

   pip install openttd-protocol pymonocypher
   

📖 Usage

Running the default client

The main.py script is configured to join the local server and the company "Én transport".

python3 main.py [Username] [CompanyID]

Example:

python3 main.py MyBot 0

Module Integration

You can use the openttd package in your own projects:

from openttd import OpenTTDClient

client = OpenTTDClient(host="127.0.0.1", username="BotName")
await client.connect(server_password="asd")
await client.join_company(company_id=0, company_password="asd123")

await client.joined.wait()
# Your logic here...

📂 Project Structure

• main.py: Main entry point and usage example.
• lib/openttd/: Core package containing the protocol and client logic.
• docs/: Extensive documentation on architecture, protocol, and contributing.
• tests/: Comprehensive test suite (Logic, Protocol, E2E).

🧪 Testing

We maintain high test coverage. To run normal (non-E2E) tests:

pytest -m "not e2e"

For detailed instructions on E2E testing and coverage reports, see the Testing Guide.

📜 Documentation

• Architecture & Design
• Protocol Internals (PAKE/Encryption)
• Vehicle Timetables Usage Guide
• Contributor Guide