Ethernet/IP Protocol Study Kit (Client + Mock Server Source Code)

🚀 Master Industrial IoT Protocols without buying expensive hardware.

Learning the Ethernet/IP (CIP) protocol is tough. Usually, you need a physical PLC (like Allen-Bradley ControlLogix) to test your code.

I solved this problem by building a Mock PLC Server in Python.

This toolkit allows you to run a "Virtual PLC" on your own computer and connect to it using a raw socket client. It is the perfect sandbox for understanding the low-level handshake of Industrial Automation protocols.

📦 What's Inside?

1. 🏭 Mock PLC Server (mock_plc_server.py):
   • Simulates a PLC listening on TCP 44818 and UDP 2222.
   • Automatically responds to Register Session and Forward Open requests.
   • Generates dummy I/O data for testing.
2. 💻 Raw Packet Client GUI (client_gui.py):
   • A multi-threaded GUI tool to connect to the server.
   • Implements the full CIP handshake (Register Session -> Forward Open -> Implicit Messaging).
   • Raw Hex Logging: See exactly what bytes are being sent and received.

✨ Why buy this?

• Zero Dependencies: Written in pure Python (socket, struct, tkinter). No complex libraries to install.
• Education Focused: The code is clean and commented, ideal for students and engineers studying SCADA security or driver development.
• Save Money: Don't spend $500+ on a PLC just to learn the handshake.

⚠️ Technical Note: This tool implements raw CIP packet construction for educational purposes. The I/O Assembly IDs are hardcoded for the simulation. For production use with real hardware, you will need to modify the hex strings to match your specific device's EDS file.