OCPP 1.6J Demo Charge Point (Python)

This project demonstrates a simple OCPP 1.6J (Open Charge Point Protocol) client implemented in Python. It simulates a charging station (Charge Point) communicating with a CSMS (Central System) using WebSocket connections.

Features

• Fully asynchronous architecture using asyncio and websockets

• Implements OCPP 1.6J (JSON over WebSocket)

• Uses @on and @after decorators for event-based message handling

• Simulates realistic transaction workflow:

  • BootNotification
  • StatusNotification (Preparing → Charging → Finishing → Available)
  • StartTransaction / StopTransaction
  • Periodic MeterValues
  • Supports DataTransfer, FirmwareUpdate, ReserveNow, and more

Requirements

Python 3.10 or later is recommended.

pip install asyncio websockets ocpp nest_asyncio

Usage

1. Start an OCPP 1.6J CSMS server (e.g., mobilityhouse/ocpp).
2. Run the client:

python ocpp_client.py

Default WebSocket URL:

ws_url = "ws://localhost:8000/OCPP/1/CP2"

You can change the URL inside the main() function.

Example Flow

When the CSMS sends a RemoteStartTransaction request, the client performs:

1. CP → StatusNotification (Preparing)
2. CP → StartTransaction
3. CP → DataTransfer
4. CP → MeterValues (SoC, Voltage, Current, Energy)
5. CP → StopTransaction
6. CP → StatusNotification (Available)

Notes

• Designed for testing and demo purposes.
• Can be easily extended with additional OCPP actions or integrated with real hardware.
• Tested against both Python and .NET CSMS implementations.

License

MIT License — free to use, modify, and distribute.

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Author

Burak Duman Embedded & Backend Developer | OCPP · IoT · Python GitHub · LinkedIn- Added note about WebSocket URL configuration.