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
})
57 @on(Action
.TransactionEvent
)
58 async def on_transaction_event(self
, event_type
, timestamp
, trigger_reason
, seq_no
,
59 transaction_info
, **kwargs
):
61 case TransactionEventType
.started
:
62 logging
.info("Received TransactionEvent Started")
63 return ocpp
.v201
.call_result
.TransactionEvent(
64 id_token_info
={'status': AuthorizationStatusType
.accepted
})
65 case TransactionEventType
.updated
:
66 logging
.info("Received TransactionEvent Updated")
67 return ocpp
.v201
.call_result
.TransactionEvent(
69 case TransactionEventType
.ended
:
70 logging
.info("Received TransactionEvent Ended")
71 return ocpp
.v201
.call_result
.TransactionEvent()
73 @on(Action
.MeterValues
)
74 async def on_meter_values(self
, evse_id
, meter_value
, **kwargs
):
75 logging
.info("Received MeterValues")
76 return ocpp
.v201
.call_result
.MeterValues()
78 # Request handlers to emit OCPP messages.
79 async def send_clear_cache(self
):
80 request
= ocpp
.v201
.call
.ClearCache()
81 response
= await self
.call(request
)
83 if response
.status
== ClearCacheStatusType
.accepted
:
84 logging
.info("Cache clearing successful")
86 logging
.info("Cache clearing failed")
89 # Function to handle new WebSocket connections.
90 async def on_connect(websocket
, path
):
91 """ For every new charge point that connects, create a ChargePoint instance and start
92 listening for messages."""
94 requested_protocols
= websocket
.request_headers
['Sec-WebSocket-Protocol']
96 logging
.info("Client hasn't requested any Subprotocol. Closing Connection")
97 return await websocket
.close()
99 if websocket
.subprotocol
:
100 logging
.info("Protocols Matched: %s", websocket
.subprotocol
)
102 logging
.warning('Protocols Mismatched | Expected Subprotocols: %s,'
103 ' but client supports %s | Closing connection',
104 websocket
.available_subprotocols
,
106 return await websocket
.close()
108 charge_point_id
= path
.strip('/')
109 cp
= ChargePoint(charge_point_id
, websocket
)
111 # Start the ChargePoint instance to listen for incoming messages.
115 # Main function to start the WebSocket server.
117 # Create the WebSocket server and specify the handler for new connections.
118 server
= await websockets
.serve(
120 '127.0.0.1', # Listen on loopback.
122 subprotocols
=['ocpp2.0', 'ocpp2.0.1'] # Specify OCPP 2.0.1 subprotocols.
124 logging
.info("WebSocket Server Started")
125 # Wait for the server to close (runs indefinitely).
126 await server
.wait_closed()
129 # Entry point of the script.
130 if __name__
== '__main__':
131 # Run the main function to start the server.