3 from datetime
import datetime
, timezone
4 from threading
import Timer
8 from ocpp
.routing
import on
9 from ocpp
.v201
.enums
import RegistrationStatusType
, ClearCacheStatusType
, AuthorizationStatusType
, \
10 TransactionEventType
, \
13 # Setting up the logging configuration to display debug level messages.
14 logging
.basicConfig(level
=logging
.DEBUG
)
17 class RepeatTimer(Timer
):
18 """ Class that inherits from the Timer class. It will run a
19 function at regular intervals."""
22 while not self
.finished
.wait(self
.interval
):
23 self
.function(*self
.args
, **self
.kwargs
)
26 # Define a ChargePoint class inheriting from the OCPP 2.0.1 ChargePoint class.
27 class ChargePoint(ocpp
.v201
.ChargePoint
):
28 # Message handlers to receive OCPP messages.
29 @on(Action
.BootNotification
)
30 async def on_boot_notification(self
, charging_station
, reason
, **kwargs
):
31 logging
.info("Received BootNotification")
32 # Create and return a BootNotification response with the current time,
33 # an interval of 60 seconds, and an accepted status.
34 return ocpp
.v201
.call_result
.BootNotification(
35 current_time
=datetime
.now(timezone
.utc
).isoformat(),
37 status
=RegistrationStatusType
.accepted
41 async def on_heartbeat(self
, **kwargs
):
42 logging
.info("Received Heartbeat")
43 return ocpp
.v201
.call_result
.Heartbeat(current_time
=datetime
.now(timezone
.utc
).isoformat())
45 @on(Action
.StatusNotification
)
46 async def on_status_notification(self
, timestamp
, evse_id
, connector_id
, connector_status
,
48 logging
.info("Received StatusNotification")
49 return ocpp
.v201
.call_result
.StatusNotification()
52 async def on_authorize(self
, id_token
, **kwargs
):
53 logging
.info("Received Authorize")
54 return ocpp
.v201
.call_result
.Authorize(
55 id_token_info
={'status': AuthorizationStatusType
.accepted
}
58 @on(Action
.TransactionEvent
)
59 async def on_transaction_event(self
, event_type
, timestamp
, trigger_reason
, seq_no
,
60 transaction_info
, **kwargs
):
62 case TransactionEventType
.started
:
63 logging
.info("Received TransactionEvent Started")
64 return ocpp
.v201
.call_result
.TransactionEvent(
65 id_token_info
={'status': AuthorizationStatusType
.accepted
}
67 case TransactionEventType
.updated
:
68 logging
.info("Received TransactionEvent Updated")
69 return ocpp
.v201
.call_result
.TransactionEvent(
72 case TransactionEventType
.ended
:
73 logging
.info("Received TransactionEvent Ended")
74 return ocpp
.v201
.call_result
.TransactionEvent()
76 @on(Action
.MeterValues
)
77 async def on_meter_values(self
, evse_id
, meter_value
, **kwargs
):
78 logging
.info("Received MeterValues")
79 return ocpp
.v201
.call_result
.MeterValues()
81 # Request handlers to emit OCPP messages.
82 async def send_clear_cache(self
):
83 request
= ocpp
.v201
.call
.ClearCache()
84 response
= await self
.call(request
)
86 if response
.status
== ClearCacheStatusType
.accepted
:
87 logging
.info("Cache clearing successful")
89 logging
.info("Cache clearing failed")
92 # Function to handle new WebSocket connections.
93 async def on_connect(websocket
, path
):
94 """ For every new charge point that connects, create a ChargePoint instance and start
95 listening for messages."""
97 requested_protocols
= websocket
.request_headers
['Sec-WebSocket-Protocol']
99 logging
.info("Client hasn't requested any Subprotocol. Closing Connection")
100 return await websocket
.close()
102 if websocket
.subprotocol
:
103 logging
.info("Protocols Matched: %s", websocket
.subprotocol
)
105 logging
.warning('Protocols Mismatched | Expected Subprotocols: %s,'
106 ' but client supports %s | Closing connection',
107 websocket
.available_subprotocols
,
110 return await websocket
.close()
112 charge_point_id
= path
.strip('/')
113 cp
= ChargePoint(charge_point_id
, websocket
)
115 # Start the ChargePoint instance to listen for incoming messages.
119 # Main function to start the WebSocket server.
121 # Create the WebSocket server and specify the handler for new connections.
122 server
= await websockets
.serve(
124 '127.0.0.1', # Listen on loopback.
126 subprotocols
=['ocpp2.0', 'ocpp2.0.1'] # Specify OCPP 2.0.1 subprotocols.
128 logging
.info("WebSocket Server Started")
129 # Wait for the server to close (runs indefinitely).
130 await server
.wait_closed()
133 # Entry point of the script.
134 if __name__
== '__main__':
135 # Run the main function to start the server.