How to Install Mosquitto MQTT Broker/Server on Ubuntu Cloud Server

Here is How To How to Install Mosquitto MQTT Broker/Server on Ubuntu Cloud Server So That You Need Not to Depend on Third Party MQTT Broker. To connect to a command line on your server instance you will need to use SSH with `root` privilege.

Update, upgrade and install the required packages from Ubuntu repo :

#
sudo apt update
sudo apt install mosquitto
# install the clients
sudo apt-get install mosquitto-clients
#

Run :

#
mosquitto -v
netstat –at 
#

You should see the Mosquitto broker running on port 1883. The configuration file `mosquitto.conf` that comes with the install only has a few lines for logging. Secure with a Password :

sudo mosquitto_passwd -c /etc/mosquitto/passwd mqtt_user_name

Create a configuration file for Mosquitto pointing to the password file we have just created :

sudo nano /etc/mosquitto/conf.d/default.conf
...
allow_anonymous false
password_file /etc/mosquitto/passwd
...

Restart :

sudo systemctl restart mosquitto

To start mosquitto using a configuration file use the following command:

mosquitto -c filename

You can find the `mosquitto.conf` template file in the `/etc/mosquitto/` folder. Mosquitto clients help us easily test MQTT through a command line utility.

In case you install Let’s Encrypt, In order to speak MQTT using JavaScript from within web browsers, the protocol was adapted to work over standard websockets. If you do not need this functionality, you may skip.
We need to add one more listener block to our Mosqiutto config:

sudo nano /etc/mosquitto/conf.d/default.conf

Change like this :

. . .
listener 8083
protocol websockets
certfile /etc/letsencrypt/live/mqtt.example.com/cert.pem
cafile /etc/letsencrypt/live/mqtt.example.com/chain.pem
keyfile /etc/letsencrypt/live/mqtt.example.com/privkey.pem
...

There are browser-based MQTT clients. Eclipse Paho JavaScript Client is simple, straightforward and commonly used. You can open the Paho client in your browser. Paho can be found here :

https://www.eclipse.org/paho/clients/js/

Node-RED is a browser-based graphical interface for ‘wiring’ together with the Internet of Things. MQTT is very well supported by Node-RED.

This ends this guide. It is not very difficult to run own MQTT server, even on R Pi. Other tools are linked from IBM’s this repo :

https://github.com/ibm-watson-iot/iot-java

There is HiveMQ and lot of tools.

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