ocpp: A Python repository from lsaavedr

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OCPP

Python package implementing the JSON version of the Open Charge Point Protocol (OCPP). Currently OCPP 1.6 (errata v4) and OCPP 2.0 are supported.

You can find the documentation on rtd.

Installation

You can either the project install from Pypi:

$ pip install ocpp

Or clone the project and install it manually using:

$ pip install .

Quick start

Below you can find examples on how to create a simple OCPP 2.0 central system as well as an OCPP 2.0 charge point.

Note

To run these examples the dependency websockets is required! Install it by running:

$ pip install websockets

Central system

The code snippet below creates a simple OCPP 2.0 central system which is able to handle BootNotification calls. You can find a detailed explanation of the code in the Central System documentation_.

import asyncio
import logging
import websockets
from datetime import datetime

from ocpp.routing import on
from ocpp.v20 import ChargePoint as cp
from ocpp.v20 import call_result

logging.basicConfig(level=logging.INFO)


class ChargePoint(cp):
    @on('BootNotification')
    def on_boot_notitication(self, charging_station, reason, **kwargs):
        return call_result.BootNotificationPayload(
            current_time=datetime.utcnow().isoformat(),
            interval=10,
            status='Accepted'
        )

async def on_connect(websocket, path):
    """ For every new charge point that connects, create a ChargePoint instance
    and start listening for messages.

    """
    charge_point_id = path.strip('/')
    cp = ChargePoint(charge_point_id, websocket)

    await cp.start()


async def main():
    server = await websockets.serve(
        on_connect,
        '0.0.0.0',
        9000,
        subprotocols=['ocpp2.0']
    )

    await server.wait_closed()


if __name__ == '__main__':
    asyncio.run(main())

Charge point

import asyncio
import logging
import websockets

from ocpp.v20 import call
from ocpp.v20 import ChargePoint as cp

logging.basicConfig(level=logging.INFO)


class ChargePoint(cp):

    async def send_boot_notification(self):
        request = call.BootNotificationPayload(
                charging_station={
                    'model': 'Wallbox XYZ',
                    'vendor_name': 'anewone'
                },
                reason="PowerUp"
        )
        response = await self.call(request)

        if response.status == 'Accepted':
            print("Connected to central system.")


async def main():
    async with websockets.connect(
        'ws://localhost:9000/CP_1',
         subprotocols=['ocpp2.0']
    ) as ws:

        cp = ChargePoint('CP_1', ws)

        await asyncio.gather(cp.start(), cp.send_boot_notification())


if __name__ == '__main__':
    asyncio.run(main())

License