Help me figure out how to implement it correctly. The bottom line: The client is charging stations that connect, open a socket and send messages to the server and receive responses. Server - listens to the port, sees the connected station, receives messages and sends responses to them. Question: When the client connects and sends headers, I can send a message to the client. But I need to periodically send messages to the client that keeps the socket open, I don't understand how to implement this. Can someone tell me?

sample sending code:

charge_point_id = path.strip('/')
    cp = client_main(charge_point_id, websocket)
    logging.info(charge_point_id)
    print(charge_point_id)
    print(path)
    await websocket.send(json.dumps([2,"222", "GetLocalListVersion", {}]))
    await cp.start()

example of receiving a message from a client:

class client_main(cp):

        errors = False
            
        if not errors:
            
                        
            @on('BootNotification')
            def on_boot_notitication(self,    charge_point_vendor, charge_point_model,charge_point_serial_number,firmware_version, 
                                     meter_type, **kwargs):
               return call_result.BootNotificationPayload(
                    status="Accepted",
                    current_time=date_str.replace(' 00:00','Z'),
                    interval=60
                )

CodePudding user response：

This is impossible to do. You can send a message only when the client is connected.

CodePudding user response：

in this case, the charging station according to the ocpp protocol opens the connection and keeps it open, it should be possible to somehow write to him