For some reasons I can't explain, I had to make some little modifications in the source code of the downloaded libraries. Here are the steps I followed:

• Following the recommendations at: https://stackoverflow.com/questions/48701475/qt-creator-adding-mqtt-library, I executed the following commands:

  • git clone git://code.qt.io/qt/qtmqtt.git

  • qmake
    
    make
    
    make install

• When I typed the "make" command, some errors appeared (I need to clarify that I entirely installed QT creator and other packets from Debian official repositories (apt-get). The first issue was that I did not have installed packages qtbase5-private-dev and libqt5websockets5-dev (maybe I needed to install qtdeclarative5-dev).
• This solved the dependencies issues, but compilation errors like this remained: qmqtttopicfilter.cpp:206:26: error: no match for ‘operator==’ (operand types are ‘QString’ and ‘QLatin1Char’)
               || d->filter == QLatin1Char('#')
• Following the same recommendations, I opened the qtmqtt.pro file with my QT and made the following modifications at the qmqtttopicfilter.cpp file:
  • || d->filter == QLatin1Char('#')             -------------------->                  || d->filter[0] == QLatin1Char('#')
  • if (level != QLatin1Char('+') && level != topicLevels.at(i))   -------------------------->        if (level[0] != QLatin1Char('+') && level != topicLevels.at(i))
• Voilà.. the problem is fixed and now it can be compiled. Then I tested the result with the subscriptions example.

Details

Category: Post

Published: 03 December 2018

Created: 03 December 2018

Last Updated: 03 December 2018

Hits: 4042

From: https://stackoverflow.com/questions/16956810/how-do-i-find-all-files-containing-specific-text-on-linux

Type: grep -rnw '/path/to/somewhere/' -e 'pattern'

Details

Category: Post

Published: 03 January 2018

Created: 03 January 2018

Last Updated: 03 January 2018

Hits: 1725

• Linux

• (Examples with eth0)
• Examples of network configuration files.
• In /etc/network/interfaces
• With DHCP

                               #The primary network interface
                               allow-hotplug eth0
                               iface eth0 inet dhcp

• With static IP

                               iface eth0 inet static
                               address <IP ADDRESS>
                               netmask <SUBNET MASK>
                               network <NETWORK ADDRESS>
                               broadcast <BROADCAST ADDRESS>
                               gateway <GATEWAY ADDRESS>

• DNS servers. In /etc/resolv.conf
• Adding default address to local route table. Enter: sudo route add default gw <GATEWAY ADDRESS>
• Restart eth0
• ifdown eth0
• ifup eth0

Details

Category: Post

Published: 26 April 2018

Created: 26 April 2018

Last Updated: 26 April 2018

Hits: 1693

Embedding fonts in a PDF file (useful for compatibility with IEEE). Command: ps2pdf -dCompatibilityLevel=1.4 -dPDFSETTINGS=/prepress <IN>.ps <OUT>.pdf

Details

Category: Post

Published: 03 September 2017

Created: 03 September 2017

Last Updated: 03 September 2017

Hits: 1748