Examples on integrating with Django Channels ?

Are there any examples on integrating this library with Django Channels ?

I see examples on how to integrate with WebSockets library, but Django Channels and it’s “Consumers” would be also nice. At least small example on how to create few handlers on Consumer. I’m trying something, but it turned out to be a really long method on JsonWebsocketConsumer

Thank you.

[dinko-pehar]

I managed to create basic “Consumer” for OCPP. If anyone searches for Django Channels integration, I have used something like (only “ocpp1.6” is accepted):

from dataclasses import asdict
from datetime import datetime

from channels.generic.websocket import JsonWebsocketConsumer
from ocpp.messages import pack, unpack
from ocpp.v16 import call_result, enums


class ChargepointConsumer(JsonWebsocketConsumer):
    def connect(self):
        # TODO: Check if CP exists.

        if "ocpp1.6" not in self.scope["subprotocols"]:
            self.close(1002)

        self.accept("ocpp1.6")

    def decode_json(self, text_data):
        return unpack(text_data)

    def encode_json(self, content):
        return pack(content)

    def receive_json(self, content):

        # For related "Call", create proper "CallResult".
        if content.action == "BootNotification":
            # Handle received payload.
            # TODO: Save to database ?

            # Create result payload.
            payload = call_result.BootNotificationPayload(
                current_time=datetime.utcnow().isoformat(),
                interval=10,
                status=enums.RegistrationStatus.accepted,
            )
        elif content.action == "Heartbeat":
            # Create result payload.
            payload = call_result.HeartbeatPayload(
                current_time=datetime.utcnow().isoformat()
            )

        # Send "CallResult"
        self.send_json(content.create_call_result(asdict(payload)))

There are some pieces missing, but if anyone has better approach, feel free to write.

[OrangeTux]

The connection argument of ChargePoint must satisfy the interface async def send(msg: str) and async def recv() -> str. See https://github.com/mobilityhouse/ocpp/issues/94#issuecomment-643911096 . I don’t know Django Channels, but I guess it would be easy to create a wrapper around this type that satisfies the interface.