MQTT Publisher

Module for MagicMirror publishing notifications from MM notification mechanism to any MQTT Broker(s).

This module allows publishing to a MQTT broker e.g. an IoT framework such as OpenHAB, DSLinks, etc, or some other MQTT broker.

Note: Best used with MMM-MQTT to allow subscribing to an MQTT broker and retrieving information from an MQTT Broker

This project was forked and adapted from @ottopaulsen's MMM-MQTT

Any issues, please report and pull requests are most welcome

Screenshot

Shows that it is active and running. This will most likely include last send notifications with a timeout feature in future

What is MQTT

MQTT is a lightweight messaging protocol implementing the Publish–subscribe pattern, used in mainly in smart (or M2M) environments to allow devices and sensors and basically anything to communicate with anything else, requiring a MQTT broker (i.i. a mosquitto server) see for more info

Installation

Open up your terminal, navigate to /path/to/MagicMirror/modules. Then type in:

git clone https://github.com/cybex-dev/MMM-MQTT-Publisher
cd MMM-MQTT-Publisher
npm install

Configuration

Here is an example configuration with description. Put it in the MagicMirror/config/config.js file:

{
    module: 'MMM-MQTT-Publisher',
    position: 'bottom_left',
    header: 'MQTT Publisher',
    config: {
        mqttServers: [
            {
                address: 'localhost',       // Server address or IP address
                port: '1883',               // Port number if other than default
                user: '',                   // Leave out for no user
                password: '',               // Leave out for no password
                publications: [             // multiple topic, notification tuples are allowed
                    {
                        topic: 'calender/event',                // Topic to look for
                        notification: 'CALENDER_EVENTS'         // Broadcast data received by `CLOCK_TICK` notification.
                    },
                ]
            },
        ],
    }
}

mqttServers is an array, so you can add multiple servers to the same config. You can also use the module multiple places on the mirror/screen.

Configuration options

The following properties can be configured:

Option	Description
position	Location on MagicMirror display
mqttServers	An array of servers.

MQTT Server Configuration options

The following properties can be configured for an MQTT Server:

Option	Description
address	Address (IPv4 or hostname). Default value: localhost
port	The port which the MQTT listens on. Default value: 1883
user	Username credential of the MQTT broker requires it. This can be left blank if no username is required
password	Password credential of the MQTT broker requires it. This can be left blank if no password is required
publications	An array of notifications which the MQTT broker will be accepting from the MM-MQTT module.

Publishing

MM-MQTT module also allows publishing of data to topics. For a specific MQTT Server, an array of notifications and corresponding topics is defined.

When a notification is received via MM notification mechanism, it is received by the MQTT-Module. This notification is checked against each MQTT Server's publication notifications and the data is published to the topic if needed.

This is detailed below:

Option	Description
topic	The topic to publish to. e.g. clock or home/door/sensor/open
notification	The notification to publish on if present. CALENDER_EVENTS

How To Publish

Publishing data to the MQTT server is done by sending a notification from your module by calling from within your module (not in the node_helper module)

this.sendNotification(notification, payload)

where:

Parameter	Description
notification	your desired notification name. This can be CALENDER_EVENTS or CLOCK_TICK
payload	the data you wish to send to the MQTT broker.

JSON Data

If the payload contains JSON data, use the jsonpointer configuration to get the value. See JSON Ponter specification or google an easier description.

When dealing with a topic named e.g. /mirror/clock/tick, you will need to parse the topic and its value into a JSON object.

Example

You want to publish data to the topic /mirror/clock/tick with value 21

The resulting JSON Object format is: {"mirror": {"clock": {"tick": 21}}}

p.s. don't forget about adding quotes to each string value to match JSON compatibility

Collaborate

Pull requests are welcome.

TO DO

Create more descriptive GUI possibly adding a list of notifications with the most recently published first.