• apt install mosquitto mosquitto-clients -y

• mosquitto_sub -h localhost -t test
• mosquitto_pub -h localhost -t test -m "Hello World"
• mosquitto_sub -h localhost -t test

Default Port : 1883

• sudo mosquitto_passwd -c /etc/mosquitto/passwd admin
• sudo nano /etc/mosquitto/conf.d/default.conf
• copy these lines to the file
• allow_anonymous false
• password_file /etc/mosquitto/passwd

3. sudo systemctl restart mosquitto

1. mosquitto_sub -h localhost -t test -u "admin" -P "password"
2. mosquitto_pub -h localhost -t "test" -m "Hello World" -u "admin" -P "password"

• pip3 install paho-mqtt
• apt install python3-paho-mqtt -y