MQTT-Django Bridge

Interface MQTT ASGI compatible with Django Channels 3.

Installation

pip install django-mqtt-bridge

Configuration

First you would to configure a valid channel_layer endpoint to consume and connect between django-mqtt-bridge and channels.

In your_channel_application/asgi.py:

import os
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "your_channel_application.settings")

import django
from channels.routing import get_default_application
from channels.layers import get_channel_layer

django.setup()

# Application
application = get_default_application()

# Layers
channel_layer = get_channel_layer()

In your_channel_application/consumers.py:

from channels.consumer import SyncConsumer

class MqttConsumer(SyncConsumer):
    def mqtt_sub(self, event):
        topic = event['text']['topic']
        payload = event['text']['payload']
        # do something with topic and payload
        print('{} - {}'.format(topic, payload))

    def mqtt_pub(self, event):
        pass

In your_channel_application/routing.py:

from django.core.asgi import get_asgi_application
from .consumers import MqttConsumer
from channels.routing import ProtocolTypeRouter, ChannelNameRouter, URLRouter
from channels.auth import AuthMiddlewareStack

application = ProtocolTypeRouter({
    "http": get_asgi_application(),
    "channel": ChannelNameRouter(
        {
            "mqtt.pub": MqttConsumer.as_asgi()
        }
    )
})

Usage

django_mqtt_bridge -H iot.eclipse.org -p 1883 --topic=some_topic:2 your_channel_application.asgi:channel_layer

Options

django_mqtt_bridge -h

usage: django_mqtt_bridge [-h] [-H HOST] [-p PORT] [-v] [-U USERNAME] [-P PASSWORD]
                  [--topic TOPICS] [-n CHANNEL_NAME] [-s CHANNEL_SUB]
                  [-x CHANNEL_PUB]
                  channel_layer

Simple MQTT bridge for ASGI

positional arguments:
  channel_layer         The ASGI channel layer instance to use as
                        path.to.module:instance.path

optional arguments:
  -h, --help            show this help message and exit
  -H HOST, --host HOST  MQTT broker host
  -p PORT, --port PORT  MQTT broker port
  -v, --verbosity       Set verbosity
  -U USERNAME, --username USERNAME
                        MQTT username to authorised connection
  -P PASSWORD, --password PASSWORD
                        MQTT password to authorised connection
  --topic TOPICS        MQTT topics with qos to subscribe --topic TOPIC:QOS
                        --topic /office/sensor:0 --topic /home/sensor:1 If
                        empty (#, 2) is set as default
  -n CHANNEL_NAME, --channel-name CHANNEL_NAME
                        Name of Channels's channel to send and receive
                        messages
  -s CHANNEL_SUB, --channel-sub CHANNEL_SUB
                        Name of Channels's channel for MQTT Sub messages,
                        default is mqtt.pub
  -x CHANNEL_PUB, --channel-pub CHANNEL_PUB
                        Name of Channels's channel for MQTT Pub messages,
                        default is mqtt.sub

HOST: MQTT broker host

PORT: MQTT broker port, default 1883

USERNAME: MQTT username to authorised connection

PASSWORD: MQTT password to authorised connection

TOPICS: MQTT topics with qos to subscribe. This option expect a valid topic name and a QOS value splited by :

To subscribe to a list of topics use the same option --topic.

django-mqtt-bridge --topic some_topic:qos --topic another_topic:qos --topic home/kitchen_gas_sensor:2 --topic home/office_air_sensor:0

CHANNEL_NAME : Name of Channels's channel to send and receive messages, this channel_name must to exist in your channel's consumer, default is mqtt.

CHANNEL_SUB : Name of Channels's channel for MQTT Sub messages, default is mqtt.sub.

CHANNEL_PUB : Name of Channels's channel for MQTT Pub messages, default is mqtt.pub.