Download QT MQTT
# git clone https://github.com/qt/qtmqtt.git
# cd qtmqtt
# mkdir build && cd build
Setting QT Environment
# QT_INSTALL_DIR=/opt/Qt5.11.0/5.11.0/
# QT_QMAKE_DIR=$QT_INSTALL_DIR/gcc_64/bin/qmake
# $QT_QMAKE_DIR qmake -r ..
# make
# make install
