3 from datetime
import datetime
, timezone
6 from ocpp
.routing
import on
7 from ocpp
.v201
import ChargePoint
as cp
8 from ocpp
.v201
import call_result
9 from ocpp
.v201
.enums
import RegistrationStatusType
, GenericDeviceModelStatusType
11 # Setting up the logging configuration to display debug level messages.
12 logging
.basicConfig(level
=logging
.DEBUG
)
15 # Define a ChargePoint class inheriting from the OCPP 2.0.1 ChargePoint class.
16 class ChargePoint(cp
):
17 # Message handlers to receive OCPP message.
18 @on('BootNotification')
19 async def on_boot_notification(self
, charging_station
, reason
, **kwargs
):
20 logging
.info("Received BootNotification")
21 # Create and return a BootNotification response with the current time,
22 # an interval of 10 seconds, and an accepted status.
23 return call_result
.BootNotification(
24 current_time
=datetime
.now(timezone
.utc
).isoformat(),
26 status
=RegistrationStatusType
.accepted
29 # Request handlers to emit OCPP messages.
32 # Function to handle new WebSocket connections.
33 async def on_connect(websocket
, path
):
34 """ For every new charge point that connects, create a ChargePoint instance and start
35 listening for messages."""
37 requested_protocols
= websocket
.request_headers
['Sec-WebSocket-Protocol']
39 logging
.info("Client hasn't requested any Subprotocol. Closing Connection")
40 return await websocket
.close()
42 if websocket
.subprotocol
:
43 logging
.info("Protocols Matched: %s", websocket
.subprotocol
)
45 logging
.warning('Protocols Mismatched | Expected Subprotocols: %s,'
46 ' but client supports %s | Closing connection',
47 websocket
.available_subprotocols
,
49 return await websocket
.close()
51 charge_point_id
= path
.strip('/')
52 cp
= ChargePoint(charge_point_id
, websocket
)
54 # Start the ChargePoint instance to listen for incoming messages.
58 # Main function to start the WebSocket server.
60 # Create the WebSocket server and specify the handler for new connections.
61 server
= await websockets
.serve(
63 '127.0.0.1', # Listen on loopback.
65 subprotocols
=['ocpp2.0', 'ocpp2.0.1'] # Specify OCPP 2.0.1 subprotocols.
67 logging
.info("WebSocket Server Started")
68 # Wait for the server to close (runs indefinitely).
69 await server
.wait_closed()
72 # Entry point of the script.
73 if __name__
== '__main__':
74 # Run the main function to start the server.