MQTT Essentials
https://www.hivemq.com/blog/mqtt-essentials/
Install Mosquitto MQTT Messaging Broker on Ubuntu 16.04
https://pupli.net/2017/08/09/install-mosquitto-mqtt-messaging-broker-on-ubuntu-16-04/
Install Mosquitto MQTT Messaging Broker on Windows
https://pupli.net/2017/08/10/install-mosquitto-mqtt-messaging-broker-on-windows/
Build MQTT Paho C++ on Windows
https://pupli.net/2017/09/26/build-mqtt-paho-c-on-windows/
How to Install and Secure the Mosquitto MQTT Messaging Broker on Ubuntu 16.04
https://pupli.net/2017/11/11/how-to-install-and-secure-the-mosquitto-mqtt-messaging-broker-on-ubuntu-16-04/
Publish a Message From Android on MQTT
https://pupli.net/2017/10/06/publish-a-message-from-android-on-mqtt/
MQTT Topics & Best Practices
https://pupli.net/2017/11/25/mqtt-topics-best-practices/
Maximum simultaneous connections on a mosquitto broker
https://pupli.net/2017/12/13/maximum-simultaneous-connections-on-a-mosquitto-broker/
Modify Socket parameters of Mqtt Client
https://pupli.net/2018/05/31/modify-socket-parameters-of-mqtt-client/