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How to setup MQTT(Mosquitto) in Ubuntu ?

Steps for Basic configuration and Install MQTT.

Open port TCP:1883 on firewall

Step 1: Install Mosquitto Broker
sudo apt-get update
sudo apt-get install mosquitto

Step 2: Install Mosqitto clients
sudo apt-get install mosquitto-clients
mosquitto_sub -t "test"

 Step 3: Test
mosquitto_pub -m "message from mosquitto_pub client" -t "test"

Step 4: Secure with a Password
sudo mosquitto_passwd -c /etc/mosquitto/passwd
Password:
RetypePassword:
sudo nano /etc/mosquitto/conf.d/default.conf


Paste below lines
allow_anonymous false
password_file /etc/mosquitto/passwd

Step 5: Restart server
sudo systemctl restart mosquitto

Step 6: Test
mosquitto_sub -t "test" -u "testuser" -P "testpassword"
Error
mosquitto_pub -t "test" -m "message from mosquitto_pub client"
Success
mosquitto_pub -t "test" -m "message from mosquitto_pub client" -u "testuser" -P "testpassword"

 Step 7 — Configuring Mosquitto Over Websockets (Optional)
sudo nano /etc/mosquitto/conf.d/default.conf
allow_anonymous false
password_file /etc/mosquitto/passwd
listener 9001
protocol websockets
listener 1883 <ip-address>

Step 8 - Allow port in firewall
sudo ufw allow 8083
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