get_configuration.py

import asyncio
from datetime import datetime

try:
    import websockets
except ModuleNotFoundError:
    print("This example relies on the 'websockets' package.")
    print("Please install it by running: ")
    print()
    print(" $ pip install websockets")
    import sys
    sys.exit(1)

from ocpp.routing import on
from ocpp.v16 import ChargePoint as cp
from ocpp.v16.enums import Action, RegistrationStatus
from ocpp.v16 import call_result, call


class ChargePoint(cp):
    @on(Action.BootNotification)
    def on_boot_notitication(self, charge_point_vendor, charge_point_model, **kwargs):
        return call_result.BootNotificationPayload(
	    current_time=datetime.utcnow().isoformat(),
	    interval=10,
	    status=RegistrationStatus.accepted
	)
      
    async def get_configuration(self):
        response  = await self.call(call.GetConfigurationPayload())
    
        # Setting is a dict with 3 keys: key, value and readonly. 
	# See section 7.29 in https://github.com/mobilityhouse/ocpp/blob/master/docs/v16/ocpp-1.6.pdf
        for setting in response.configuration_key:
            print(f"{setting['key']}: {setting['value']}")
    

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 asyncio.gather(cp.start(), cp.get_configuration())


async def main():
    server = await websockets.serve(
        on_connect,
        '0.0.0.0',
        9000,
        subprotocols=['ocpp1.6']
    )

    await server.wait_closed()


if __name__ == '__main__':
    try:
        # asyncio.run() is used when running this example with Python 3.7 and
        # higher.
        asyncio.run(main())
    except AttributeError:
        # For Python 3.6 a bit more code is required to run the main() task on
        # an event loop.
        loop = asyncio.get_event_loop()
        loop.run_until_complete(main())
        loop.close()