Added Scanner identification and MQTT handling

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}))