OpenHab2 - MQTT binding demo

This demo demonstrates how to use MQTT binding addon in OpenHAB2 installed into Orange Pi zero. The idea is very basic. A switch is created on default sitemap. When you turn on the switch, it sends "ON" message to Topic /office/light via MQTT broker that is installed on Orange Pi. When you turn off the switch, it sends "OFF" message to Topic /office/light.

Require

Openhab2

MQTT broker installed.

First, install MQTT binding via paperui

Define all the brokers which you want to connect to, in your services/mqtt.cfg file.

cd /etc/openhab2/services

sudo nano mqtt.cfg

Edit the file as follow

#
# Define your MQTT broker connections here for use in the MQTT Binding or MQTT
# Persistence bundles. Replace <broker> with an ID you choose.
#

# URL to the MQTT broker, e.g. tcp://localhost:1883 or ssl://localhost:8883
mosquitto.url=tcp://localhost:1883

# Optional. Client id (max 23 chars) to use when connecting to the broker.
# If not provided a default one is generated.
mosquitto.clientId=lion

# Optional. User id to authenticate with the broker.
#<broker>.user=<user>

# Optional. Password to authenticate with the broker.
#<broker>.pwd=<password>

In the file you can see that 'mosquitto" is an MQTT broker name based on eclipse mosquitto. The broker is installed into the Orange Pi running Debian. So that the broker url is "localhost".

Define demo item in demo.items

I define a switch which will be use to send the switch status (ON or OFF) via an MQTT message when a user click on it.

Switch mySwitch {mqtt=">[mosquitto:/office/light:command:ON:1],>[mosquitto:/office/light:command:OFF:0]"}

Define sitemap

Open sitemap file (for example: demo.sitemap) and edit as follow;

sitemap default label="My first sitemap"
{
    Switch item=mySwitch label="Office Light"

}

Show log file

Open terminal, then run:

tail -f /var/log/openhab2/openhab.log