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