On the device which acts as the Mosquitto server.

• Install mosquitto

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  sudo apt install mosquitto mosquitto-clients

• Configure the broker in /etc/mosquitto/mosquitto.conf likes

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  pid_file /run/mosquitto/mosquitto.pid
  
  persistence true
  persistence_location /var/lib/mosquitto/
  
  log_dest file /var/log/mosquitto/mosquitto.log
  password_file /etc/mosquitto/p1.txt
  include_dir /etc/mosquitto/conf.d
  
  # this will listen for mqtt on tcp
  listener 1883
  allow_anonymous false
  
  # this will expect websockets connections
  listener 8083
  protocol websockets

• Restart the service by using the following command

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  sudo systemctl restart mosquitto.service

Nginx reverse proxy (Optional)Copy Anchor Link

Use HTTP reverse proxy with connection upgrade to WebSocket.

location /mqtt {
    proxy_pass http://127.0.0.1:8083;
    proxy_http_version 1.1;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $host;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "Upgrade";
}