Added Scanner identification and MQTT handling

booker/admin.py

@@ -1,3 +1,4 @@
 from django.contrib import admin
+from .models import Scanner
 
-# Register your models here.
+admin.site.register(Scanner)

booker/booker_fe_consumer.py

@@ -0,0 +1,54 @@
+from channels.generic.websocket import AsyncWebsocketConsumer
+import json
+import logging
+from homelog import settings
+
+LOGGER = logging.getLogger(__name__)
+
+
+class BookerFeConsumer(AsyncWebsocketConsumer):
+
+    async def connect(self):
+        self.scanner_id = self.scope['url_route']['kwargs']['scanner_id']
+        self.scanner_group_name = self.scanner_id
+        self.group_name = self.scanner_group_name
+        #self.group_name = settings.MQTT_CHANNEL_NAME
+        # join to group
+        await self.channel_layer.group_add(self.scanner_group_name, self.channel_name)
+        topic = f"barcodescanner/{self.scanner_id}/scan"
+        LOGGER.debug(f"send mqtt_subscribe topic {topic} to channel group {self.scanner_group_name} (my channel is {self.channel_name})")
+        await self.channel_layer.send(settings.MQTT_CHANNEL_NAME, {
+            "type": "mqtt.subscribe",
+            "topic": topic,
+            "group": self.scanner_group_name
+        })
+        await self.accept()
+
+    async def disconnect(self):
+        # leave group
+        await self.channel_layer.group_discard(self.group_name, self.channel_name)
+        LOGGER.debug(f"disconnect from channel group {self.group_name}")
+
+    async def receive(self, text_data):
+        print('>>>', text_data)
+        msg = '{"message":"pong!"}' if text_data == '{"message":"ping"}' else text_data
+        print('<<<', msg)
+        await self.channel_layer.group_send(
+            self.scanner_group_name,
+            {
+                'type': 'distribute',
+                'text': msg
+            }
+        )
+
+    async def distribute(self, event):
+        valother = event['text']
+        LOGGER.debug(f"distribute text={valother}")
+        await self.send(text_data=valother)
+
+    async def mqtt_message(self, event):
+        message = event['message']
+        topic = message['topic']
+        payload = message['payload']
+        LOGGER.debug(f"Received message with payload={payload}, topic={topic}")
+        await self.send(text_data=json.dumps({'message': payload, 'topic': topic}))

booker/models.py

@@ -1,3 +1,18 @@
 from django.db import models
+from django.conf import settings
+from homelog.system_user import get_deleted_user
 
-# Create your models here.
+
+class Scanner(models.Model):
+    named_id = models.CharField(max_length=40, unique=True)
+    description = models.CharField(max_length=200)
+    lwt_topic = models.CharField(max_length=200)
+    last_online_ts = models.DateTimeField('last datetime this scanner has been online')
+    assigned_channel_name = models.CharField(max_length=200)
+    assigned_group_name = models.CharField(max_length=200)
+    created_ts = models.DateTimeField('datetime created', auto_now_add=True)
+    created_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET(get_deleted_user),
+                                   related_name='created_scanners')
+    changed_ts = models.DateTimeField('datetime updated', auto_now=True)
+    changed_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET(get_deleted_user),
+                                   related_name='changed_scanners')

booker/mqtt_collector.py

@@ -1,48 +0,0 @@
-from channels.generic.websocket import AsyncWebsocketConsumer
-import json
-
-'''
-class ScannerCollector(WebsocketConsumer):
-    def connect(self):
-        self.accept()
-
-    def disconnect(self, close_code):
-        pass
-
-    def receive(self, text_data):
-        text_data_json = json.loads(text_data)
-        message = text_data_json['message']
-
-        self.send(text_data=json.dumps({
-            'message': message
-        }))
-'''
-
-class ScannerCollector(AsyncWebsocketConsumer):
-
-    async def connect(self):
-        self.group_name = 'scanner'
-        # join to group
-        await self.channel_layer.group_add(self.group_name, self.channel_name)
-        await self.accept()
-
-    async def disconnect(self):
-        # leave group
-        await self.channel_layer.group_discard(self.group_name, self.channel_name)
-
-    async def receive(self, text_data):
-        print('>>>', text_data)
-        msg = '{"message":"pong!"}' if text_data == '{"message":"ping"}' else text_data
-        print('<<<', msg)
-        await self.channel_layer.group_send(
-            self.group_name,
-            {
-                'type': 'distribute',
-                'text': msg
-            }
-        )
-
-    async def distribute(self, event):
-        valother = event['text']
-        await self.send(text_data=valother)
-

booker/scanner_announce_consumer.py

@@ -0,0 +1,77 @@
+import datetime
+import logging
+import re
+import json
+from channels.generic.websocket import AsyncWebsocketConsumer
+from booker.models import Scanner
+from asgiref.sync import sync_to_async
+from channels.db import database_sync_to_async
+from django.contrib.auth import get_user_model
+from homelog.system_user import get_system_user
+from homelog import settings
+from django.core.exceptions import ObjectDoesNotExist
+
+LOGGER = logging.getLogger(__name__)
+
+
+class ScannerAnnounceConsumer(AsyncWebsocketConsumer):
+
+    async def connect(self):
+        self.group_name = 'scanner-announce'
+        # join to group
+        await self.channel_layer.group_add(self.group_name, self.channel_name)
+        LOGGER.debug(f"send mqtt_subscribe to channel layer {settings.MQTT_CHANNEL_NAME} to answer on channel {self.group_name} (my channel is {self.channel_name})")
+        await self.channel_layer.send(settings.MQTT_CHANNEL_NAME, {
+            "type": "mqtt.subscribe",
+            "topic": "barcodescanner/+/status",
+            "group": self.group_name
+        })
+        LOGGER.debug("ScannerAnnounceConsumer initialized")
+        await self.accept()
+
+    async def receive(self, mqtt_message):
+        pass
+
+    async def disconnect(self, code):
+        await self.channel_layer.send(settings.MQTT_CHANNEL_NAME, {
+            "type": "mqtt.unsubscribe",
+            "topic": "barcodescanner/#/status",
+            "group": self.group_name
+        })
+        LOGGER.debug(f"Disconnect from scanner-announce, unsubscribing topic; code={code}")
+        await self.channel_layer.group_discard(self.group_name, self.channel_name)
+
+    async def distribute(self, event):
+        valother = event['text']
+        await self.send(text_data=valother)
+
+    @database_sync_to_async
+    def get_or_create_scanner(self, named_id, topic):
+        scanner, created = Scanner.objects.get_or_create(named_id=named_id, defaults={
+            'lwt_topic': topic,
+            'last_online_ts': datetime.datetime.now(),
+            'created_by': get_system_user(),
+            'changed_by': get_system_user()
+        })
+        if created:
+            LOGGER.debug(f"Created new scanner entry for {named_id}")
+        else:
+            LOGGER.debug(f"Updated scanner entry for {named_id}")
+        return scanner
+
+    async def mqtt_message(self, event):
+        message = event['message']
+        topic = message['topic']
+        qos = message['qos']
+        payload = message['payload']
+        print('Received a message at topic: ', topic)
+        print('with payload ', payload)
+        print('and QOS ', qos)
+        named_id = 'invalid'
+        m = re.match(r'barcodescanner\/(barcodescan-[0-9,a-f]{6})\/status', topic)
+        if m:
+            named_id = m[1]
+        await self.send(text_data=json.dumps({'message': payload, 'scanner': named_id, 'topic': topic}))
+        LOGGER.debug(f"Got MQTT message from {topic} with payload {payload}")
+        if payload == 'Online' or payload == 'online':
+            scanner = await self.get_or_create_scanner(named_id=named_id, topic=topic)

booker/templates/booker/index.html

@@ -4,21 +4,55 @@
 {% block title %}Scanner Index{% endblock %}
 
 {% block content %}
-    What chat room would you like to enter?<br>
+<div class="container">
-    <input id="room-name-input" type="text" size="100"><br>
+    <div class="row">
-    <input id="room-name-submit" type="button" value="Enter">
+        <h1>Booker</h1>
+        <p>Choose a scanner you want to use to book assets and container into/outof containers.</p>
+    </div>
+    <div class="row">
+        <div class="cols-12">
+        <textarea id="chat-log" cols="100" rows="7"></textarea><br>
 
-    <script>
+        What scanner would you like to use? (Refresh page if your new scanner is not shown)<br>
-        document.querySelector('#room-name-input').focus();
+        {% for scanner in object_list %}
-        document.querySelector('#room-name-input').onkeyup = function(e) {
+        <a href="/booker/{{ scanner.named_id }}/">{{ scanner.named_id }}: {{ scanner.description }}</a><br />
-            if (e.keyCode === 13) {  // enter, return
+        {% endfor %}
-                document.querySelector('#room-name-submit').click();
+        <input id="scanner-name-input" type="text" size="100"><br>
-            }
+        <input id="scanner-name-submit" type="button" value="Enter">
-        };
 
-        document.querySelector('#room-name-submit').onclick = function(e) {
+        <script>
-            var roomName = document.querySelector('#room-name-input').value;
+            document.querySelector('#scanner-name-input').focus();
-            window.location.pathname = '/booker/' + roomName + '/';
+            document.querySelector('#scanner-name-input').onkeyup = function(e) {
-        };
+                if (e.keyCode === 13) {  // enter, return
-    </script>
+                    document.querySelector('#scanner-name-submit').click();
+                }
+            };
+
+            document.querySelector('#scanner-name-submit').onclick = function(e) {
+                var scannerName = document.querySelector('#scanner-name-input').value;
+                window.location.pathname = '/booker/' + scannerName + '/';
+            };
+        </script>
+
+        <script>
+            const chatSocket = new WebSocket(
+                'ws://'
+                + window.location.host
+                + '/ws/scanner-announce/'
+            );
+
+            chatSocket.onmessage = function(e) {
+                const data = JSON.parse(e.data);
+                document.querySelector('#chat-log').value += (data.scanner + ': ' + data.message + '\n');
+            };
+
+            chatSocket.onclose = function(e) {
+                console.error('Chat socket closed unexpectedly');
+                document.querySelector('#chat-log').value += ('ERROR: Chat socket closed unexpectedly!\n');
+            };
+
+        </script>
+        </div>
+    </div>
+</div>
 {% endblock %}

booker/templates/booker/scanner.html

@@ -7,15 +7,15 @@
     <textarea id="chat-log" cols="100" rows="20"></textarea><br>
     <input id="chat-message-input" type="text" size="100"><br>
     <input id="chat-message-submit" type="button" value="Send">
-    {{ scanner_id|json_script:"room-name" }}
+    {{ scanner_id|json_script:"scanner_id" }}
     <script>
-        const roomName = JSON.parse(document.getElementById('room-name').textContent);
+        const scannerId = JSON.parse(document.getElementById('scanner_id').textContent);
 
         const chatSocket = new WebSocket(
             'ws://'
             + window.location.host
-            + '/ws/scannerdata/'
+            + '/ws/scanner/'
-            + roomName
+            + scannerId
             + '/'
         );
 

booker/urls.py

@@ -4,6 +4,6 @@ from . import views
 app_name = 'booker'
 
 urlpatterns = [
-    path('', views.index, name='index'),
+    path('', views.IndexView.as_view(), name='index'),
     path('<str:scanner_id>/', views.scanner, name='scanner')
 ]

booker/views.py

@@ -1,10 +1,14 @@
 from django.shortcuts import render
+from django.views.generic import ListView
+from .models import Scanner
 
 
-def index(request):
+class IndexView(ListView):
-    return render(request, 'booker/index.html')
+    model = Scanner
+    template_name = 'booker/index.html'
+
 
 def scanner(request, scanner_id):
     return render(request, 'booker/scanner.html', {
         'scanner_id': scanner_id
-    })
+    })

docker/create_redis.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+docker run --name redis_django    \
+    -p 6379:6379/tcp \
+    -e ALLOW_EMPTY_PASSWORD=yes \
+    -d bitnami/redis:latest

docker/start_redis.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+docker start redis_django

docker/stop_redis.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+docker stop redis_django
+

homelog/asgi.py

@@ -5,6 +5,8 @@ from channels.routing import ProtocolTypeRouter, URLRouter
 from django.core.asgi import get_asgi_application
 
 import homelog.routing
+from channels.routing import ChannelNameRouter
+from .mqtt_consumer import MqttConsumer
 
 os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'homelog.settings')
 
@@ -14,4 +16,7 @@ django_application = get_asgi_application()
 application = ProtocolTypeRouter({
     "http": get_asgi_application(),
     "websocket": AuthMiddlewareStack(URLRouter(homelog.routing.websocket_urlpatterns)),
+    "channel": ChannelNameRouter({
+        "mqtt": MqttConsumer.as_asgi(),
+    })
 })

homelog/channelsmqttproxy.py

@@ -0,0 +1,252 @@
+import asyncio
+import functools
+import json
+import logging
+import os
+import signal
+import socket
+
+from gmqtt import Client as MQTTClient
+from gmqtt.mqtt.constants import MQTTv311, MQTTv50
+
+LOGGER = logging.getLogger(__name__)
+
+
+class ChannelsMQTTProxy:
+    def __init__(self, channel_layer, settings):
+        self.channel_layer = channel_layer
+
+        # MQTTClient takes an identifier which is seen at the broker
+        # Creating the client does not connect.
+        self.mqtt = MQTTClient(
+            f"ChannelsMQTTProxy@{socket.gethostname()}.{os.getpid()}")
+        self.mqtt.set_auth_credentials(username=settings.MQTT_USER,
+                                       password=settings.MQTT_PASSWORD)
+        self.mqtt_host = settings.MQTT_HOST
+        try:
+            self.mqtt_version = settings.MQTT_VERSION
+        except AttributeError:
+            self.mqtt_version = None
+        # Hook up the callbacks and some lifecycle management events
+        self.mqtt.on_connect = self._on_connect
+        self.mqtt.on_disconnect = self._on_disconnect
+        self.mqtt.on_subscribe = self._on_subscribe
+        self.mqtt.on_message = self._on_message
+        self.stop_event = asyncio.Event()
+        self.connected = asyncio.Event()
+
+        try:
+            self.mqtt_channel_name = settings.MQTT_CHANNEL_NAME
+        except AttributeError:
+            self.mqtt_channel_name = "mqtt"
+        self.mqtt_channel_publish = f"{self.mqtt_channel_name}.publish"
+        self.mqtt_channel_message = f"{self.mqtt_channel_name}.message"
+        self.subscriptions = {}
+
+    async def run(self):
+        """This connects to the mqtt broker (retrying forever), then calls the
+        overrideable :func:`setup()` method finally awaits
+        :func:`ask_exit` is called at which point it exits cleanly.
+        Alternatively you can call :func:`connect()` and then wait for
+        :func:`finish()` Once connected the underlying qmqtt client
+        will re-connect if the connection is lost.
+
+        """
+        loop = asyncio.get_event_loop()
+        loop.add_signal_handler(signal.SIGINT, self.ask_exit)
+        loop.add_signal_handler(signal.SIGTERM, self.ask_exit)
+        await self.connect()
+        await self.finish()
+
+    async def connect(self):
+        # Connect to the broker
+        if self.mqtt_version == 311:
+            version = MQTTv311
+        else:
+            version = MQTTv50
+
+        while not self.mqtt.is_connected:
+            try:
+                await self.mqtt.connect(self.mqtt_host, version=version)
+            except Exception as e:
+                LOGGER.warning(f"Error trying to connect: {e}. Retrying.")
+                await asyncio.sleep(1)
+        self.connected.set()
+
+    async def finish(self):
+        # This will wait until the client is signalled
+        LOGGER.debug("Waiting for stop event")
+        await self.stop_event.wait()
+        await self.mqtt.disconnect()
+        LOGGER.debug("MQTT client disconnected")
+
+    def _on_connect(self, _client, _flags, _rc, _properties):
+        for s in self.subscriptions.keys():
+            LOGGER.debug(f"Re-subscribing to {s}")
+            self.mqtt.subscribe(s)
+        LOGGER.debug('Connected and subscribed')
+
+    def _on_disconnect(self, _client, _packet, _exc=None):
+        LOGGER.debug('Disconnected')
+
+    async def _on_message(self, _client, topic, payload, qos, properties):
+        LOGGER.debug(f"{topic} => '{payload}' props:{properties}")
+
+        # Check properties for 'retain' (which in this context means
+        # the message is being sent from retained backing store) and
+        # drop those.
+        # Eventually find a way to direct these to support code which can build
+        # initial state and keep it up-to-date? This is linked to
+        # connect-on-startup.
+        if properties["retain"] == 1:
+            LOGGER.debug(f"Dropping replayed retained message")
+            return
+
+        # Compose a Channel message
+        payload = payload.decode("utf-8")
+        try:
+            payload = json.loads(payload)
+        except:
+            LOGGER.debug("Payload is not JSON - sending it raw")
+            pass
+        msg = {
+            "topic": topic,
+            "payload": payload,
+            "qos": qos,
+        }
+        event = {
+            "type": self.mqtt_channel_message,  # default "mqtt.message"
+            "message": msg
+        }
+
+        tasks = list()
+        for grp in self.groups_matching_topic(topic):
+            tasks.append(self.channel_layer.group_send(grp, event))
+            LOGGER.debug(f"Calling {grp} handler for {topic}")
+        try:
+            await asyncio.gather(*tasks)
+        except Exception as e:
+            LOGGER.error("Cannot send event: {event}")
+            LOGGER.exception(e)
+
+    def subscribe(self, topic, group):
+        """Subscribes a group to an MQTT topic (passed directly to MQTT)"""
+        if topic not in self.subscriptions:
+            LOGGER.debug(f"New subscription for {topic}")
+            self.subscriptions[topic] = []
+            # We need to mqtt-subscribe now:
+
+            # This actually just sends a subscribe packet. We should
+            # store this and the details and handle the setup in
+            # _on_subscribe callback when the _mid (message id) is
+            # confirmed.
+            _mid = self.mqtt.subscribe(topic)
+        else:
+            if group in self.subscriptions[topic]:
+                LOGGER.debug(f"{group} already subscibed to {topic}")
+                return
+
+        LOGGER.debug(f"{group} subscribed to {topic}")
+        self.subscriptions[topic].append(group)
+
+    def _on_subscribe(self, _client, _mid, _qos, _properties):
+        LOGGER.debug('Subscribe callback {_mid}')
+
+    async def unsubscribe(self, topic, group):
+        """Un subscribes a group to an MQTT topic"""
+        LOGGER.debug(f"unsubscribe {group} from {topic}")
+        if topic in self.subscriptions:
+            groups = self.subscriptions[topic]
+            if group in groups:
+                LOGGER.debug(f"{group} being unsubscribed from {topic}")
+                groups.delete(topic)
+            else:
+                LOGGER.debug(f"{group} not subscribed to {topic}")
+            if not len(groups):
+                LOGGER.debug(f"No more {group}s, unsubscribing to {topic}")
+                self.mqtt.unsubscribe(topic)
+        LOGGER.debug(f"{topic} not subscribed")
+
+    def publish(self, topic=None, payload=None, qos=2, retain=True):
+        """Publish :param payload: to :param topic:"""
+        LOGGER.debug(f"Publishing {topic} = {payload}")
+        self.mqtt.publish(topic, payload, qos=qos, retain=retain)
+
+    def ask_exit(self):
+        """Handle outstanding messages and cleanly disconnect"""
+        LOGGER.warning(f"{self} received signal asking to exit")
+        self.stop_event.set()
+
+    def groups_matching_topic(self, topic):
+        groups = set()
+        for sub, gs in self.subscriptions.items():
+            if sub == topic:  # simple match
+                groups.update(gs)
+            elif self.topic_matches_sub(sub, topic):
+                LOGGER.debug(f"Found matching groups {gs}")
+                groups.update(gs)
+        return groups
+
+    # Taken from paho-mqtt - thanks :)
+    @staticmethod
+    def topic_matches_sub(sub, topic):
+        """Check whether a topic matches a subscription.
+        For example:
+        foo/bar would match the subscription foo/# or +/bar
+        non/matching would not match the subscription non/+/+
+        """
+        result = True
+        multilevel_wildcard = False
+
+        slen = len(sub)
+        tlen = len(topic)
+
+        if slen > 0 and tlen > 0:
+            if (sub[0] == '$' and topic[0] != '$') or (topic[0] == '$' and sub[0] != '$'):
+                return False
+
+        spos = 0
+        tpos = 0
+
+        while spos < slen and tpos < tlen:
+            if sub[spos] == topic[tpos]:
+                if tpos == tlen-1:
+                    # Check for e.g. foo matching foo/#
+                    if spos == slen-3 and sub[spos+1] == '/' and sub[spos+2] == '#':
+                        result = True
+                        multilevel_wildcard = True
+                        break
+
+                spos += 1
+                tpos += 1
+
+                if tpos == tlen and spos == slen-1 and sub[spos] == '+':
+                    spos += 1
+                    result = True
+                    break
+            else:
+                if sub[spos] == '+':
+                    spos += 1
+                    while tpos < tlen and topic[tpos] != '/':
+                        tpos += 1
+                    if tpos == tlen and spos == slen:
+                        result = True
+                        break
+
+                elif sub[spos] == '#':
+                    multilevel_wildcard = True
+                    if spos+1 != slen:
+                        result = False
+                        break
+                    else:
+                        result = True
+                        break
+
+                else:
+                    result = False
+                    break
+
+        if not multilevel_wildcard and (tpos < tlen or spos < slen):
+            result = False
+
+        return result

homelog/fixtures/db.user.json

@@ -0,0 +1,33 @@
+[
+  {
+    "model": "auth.user",
+    "pk": 1,
+    "fields": {
+      "password": "pbkdf2_sha256$320000$fRhSLDGgXfVXoSilNbJhj4$2zSGFf6j9IkPdBRiosaUO6ctEZl2FruRv/LnvxK5gt8=",
+      "last_login": "2022-04-02T17:29:25.538Z",
+      "is_superuser": true,
+      "username": "dirk",
+      "first_name": "",
+      "last_name": "",
+      "email": "dirk.jahnke@mailbox.org",
+      "is_staff": true, "is_active": true, "date_joined": "2022-03-09T14:13:51.157Z", "groups": [], "user_permissions": []}
+  },
+  {
+    "model": "auth.user",
+    "pk": 2,
+    "fields": {
+      "password": "pbkdf2_sha256$320000$lP0jbaUwn7gH1bKcMKS8eH$gGDViFe8zdHWiA4bSzldaQvTZoe2wm0+scNgMju8txE=",
+      "last_login": null,
+      "is_superuser": false,
+      "username": "system",
+      "first_name": "Tech",
+      "last_name": "System",
+      "email": "",
+      "is_staff": false,
+      "is_active": true,
+      "date_joined": "2022-04-05T08:08:26Z",
+      "groups": [],
+      "user_permissions": []
+    }
+  }
+]

homelog/mqtt_consumer.py

@@ -0,0 +1,55 @@
+import asyncio
+import logging
+import sys
+from channels.consumer import AsyncConsumer
+from channels.layers import get_channel_layer
+from django.conf import settings
+
+from homelog.channelsmqttproxy import ChannelsMQTTProxy
+
+LOGGER = logging.getLogger(__name__)
+
+
+class MqttConsumer(AsyncConsumer):
+    """The MqttConsumer is run as a channels worker. It starts an MQTT
+    client and handles subscription and message distribution via
+    Channels messages.
+    """
+
+    def __init__(self):
+        super().__init__()
+        self.mqttproxy = ChannelsMQTTProxy(get_channel_layer(), settings)
+        self.task = asyncio.create_task(self.mqttproxy.run())
+        self.task.add_done_callback(self.finish)
+        LOGGER.debug("MqttConsumer initialized")
+
+    def finish(self, task):
+        # For some reason the Channels worker doesn't seem to exit
+        # if there's a task with a loop signal handler
+        sys.exit(0)
+
+    async def mqtt_subscribe(self, event):
+        """This is the mqtt.subscribe channel message handler.  It subscribes
+        a channel group to a topic.  All messages received for that
+        topic will be sent to all members of the group using
+        'mqtt.message'. Multiple subscriptions are allowed.  The topic
+        uses MQTT wildcard syntax. The same topic may be subscibed by
+        multiple channel groups
+        """
+        LOGGER.debug(f"MqttConsumer.mqtt_subscribe topic={event['topic']}, group={event['group']}")
+        topic = event['topic']
+        group = event['group']
+        LOGGER.debug(f"subscribe to {topic} for {group}")
+        await self.mqttproxy.connected.wait()
+        self.mqttproxy.subscribe(topic, group)
+
+    async def mqtt_publish(self, event):
+        """The event contains a publish dict which is used by the mqtt client.
+        The values : topic, payload, qos & retain may be specified.
+        """
+        LOGGER.debug(event)
+        publish = event['publish']
+        # do something with topic and payload
+        LOGGER.debug(f"MQTT publish ({publish})")
+        await self.mqttproxy.connected.wait()
+        self.mqttproxy.publish(**publish)

homelog/routing.py

@@ -1,12 +1,15 @@
 from channels.routing import ProtocolTypeRouter, URLRouter
 from channels.auth import AuthMiddlewareStack
 from django.urls import path, re_path
-from booker.mqtt_collector import ScannerCollector
+from booker.booker_fe_consumer import BookerFeConsumer
+from booker.scanner_announce_consumer import ScannerAnnounceConsumer
 from django.core.asgi import get_asgi_application
 import os
 
 os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'homelog.settings')
 
 websocket_urlpatterns = [
-    re_path(r'ws/scannerdata/(?P<scanner_id>\w+)/$', ScannerCollector.as_asgi()),
+    re_path(r'ws/scanner/(?P<scanner_id>[\w-]+)/$', BookerFeConsumer.as_asgi()),
+    re_path(r'ws/scanner-announce/$', ScannerAnnounceConsumer().as_asgi()),
+
 ]

homelog/settings.py

@@ -77,7 +77,11 @@ ASGI_APPLICATION = 'homelog.asgi.application'
 
 CHANNEL_LAYERS = {
     'default': {
-        'BACKEND': 'channels.layers.InMemoryChannelLayer',
+        #'BACKEND': 'channels.layers.InMemoryChannelLayer',
+        "BACKEND": "channels_redis.core.RedisChannelLayer",
+        "CONFIG": {
+            "hosts": [("speicher2.fritz.box", 6379)],
+        },
     }
 }
 
@@ -142,3 +146,23 @@ MEDIA_URL = '/media/'
 MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
 
 LOGIN_URL = '/accounts/login/'
+
+MQTT_HOST = "hassio.fritz.box"
+MQTT_USER = "djangoHomelog"
+MQTT_PASSWORD = "NbuFz8RA7rgT3iPPqS"
+MQTT_VERSION = 311
+MQTT_CHANNEL_NAME = "mqtt"
+
+LOGGING = {
+    'version': 1,
+    'disable_existing_loggers': False,
+    'handlers': {
+        'console': {
+            'class': 'logging.StreamHandler',
+        },
+    },
+    'root': {
+        'handlers': ['console'],
+        'level': 'DEBUG',
+    },
+}