tests/ocpp-server/server.py

   1 import asyncio
   2 import logging
   3 from datetime import datetime, timezone
   4 from threading import Timer
   5
   6 import ocpp.v201
   7 import websockets
   8 from ocpp.routing import on
   9 from ocpp.v201.enums import RegistrationStatusType, ClearCacheStatusType, Action
  10
  11 # Setting up the logging configuration to display debug level messages.
  12 logging.basicConfig(level=logging.DEBUG)
  13
  14
  15 class RepeatTimer(Timer):
  16     """ Class that inherits from the Timer class. It will run a
  17     function at regular intervals."""
  18
  19     def run(self):
  20         while not self.finished.wait(self.interval):
  21             self.function(*self.args, **self.kwargs)
  22
  23
  24 # Define a ChargePoint class inheriting from the OCPP 2.0.1 ChargePoint class.
  25 class ChargePoint(ocpp.v201.ChargePoint):
  26     # Message handlers to receive OCPP messages.
  27     @on(Action.BootNotification)
  28     async def on_boot_notification(self, charging_station, reason, **kwargs):
  29         logging.info("Received BootNotification")
  30         # Create and return a BootNotification response with the current time,
  31         # an interval of 10 seconds, and an accepted status.
  32         return ocpp.v201.call_result.BootNotification(
  33             current_time=datetime.now(timezone.utc).isoformat(),
  34             interval=10,
  35             status=RegistrationStatusType.accepted
  36         )
  37
  38     # Request handlers to emit OCPP messages.
  39     async def send_clear_cache(self):
  40         request = ocpp.v201.call.ClearCache()
  41         response = await self.call(request)
  42
  43         if response.status == ClearCacheStatusType.accepted:
  44             logging.info("Cache clearing successful")
  45         else:
  46             logging.info("Cache clearing failed")
  47
  48
  49 # Function to handle new WebSocket connections.
  50 async def on_connect(websocket, path):
  51     """ For every new charge point that connects, create a ChargePoint instance and start
  52     listening for messages."""
  53     try:
  54         requested_protocols = websocket.request_headers['Sec-WebSocket-Protocol']
  55     except KeyError:
  56         logging.info("Client hasn't requested any Subprotocol. Closing Connection")
  57         return await websocket.close()
  58
  59     if websocket.subprotocol:
  60         logging.info("Protocols Matched: %s", websocket.subprotocol)
  61     else:
  62         logging.warning('Protocols Mismatched | Expected Subprotocols: %s,'
  63                         ' but client supports %s | Closing connection',
  64                         websocket.available_subprotocols,
  65                         requested_protocols)
  66         return await websocket.close()
  67
  68     charge_point_id = path.strip('/')
  69     cp = ChargePoint(charge_point_id, websocket)
  70
  71     # Start the ChargePoint instance to listen for incoming messages.
  72     await cp.start()
  73
  74
  75 # Main function to start the WebSocket server.
  76 async def main():
  77     # Create the WebSocket server and specify the handler for new connections.
  78     server = await websockets.serve(
  79         on_connect,
  80         '127.0.0.1',  # Listen on loopback.
  81         9000,  # Port number.
  82         subprotocols=['ocpp2.0', 'ocpp2.0.1']  # Specify OCPP 2.0.1 subprotocols.
  83     )
  84     logging.info("WebSocket Server Started")
  85     # Wait for the server to close (runs indefinitely).
  86     await server.wait_closed()
  87
  88
  89 # Entry point of the script.
  90 if __name__ == '__main__':
  91     # Run the main function to start the server.
  92     asyncio.run(main())