How can i add module mqtt to QT?

alphaT · wrote on 31 Jan 2018, 10:03

After I do all command

git clone https://github.com/emqtt/qmqtt.git
cd qmqtt
mkdir build
cd build
qmake -r ..
make
sudo make install

=> then i can complie the example code in source I download from git but when I create new project, in .pro I add line "QT += mqtt" then QT show me "Project ERROR: Unknown module(s) in QT: mqtt"

SGaist · wrote on 31 Jan 2018, 10:17

Hi and welcome to devnet,

This module is not an official Qt module so you should contact the authors of it.

As for the official QtMqtt module, it is located at http://code.qt.io/cgit/qt/qtmqtt.git/

alphaT · wrote on 31 Jan 2018, 14:56

Thank you for reply my question.
Is there any way to using it in QT ? because I see it has been added with the other QT module.

mrjj · wrote on 31 Jan 2018, 17:52

Hi
is github.com/emqtt a true Qt module ?
Looks to me as just an normal c++ lib/so/dll ?

To use such lib, one would just tell Creator via the .pro file
http://doc.qt.io/qt-5/third-party-libraries.html
Key points being

INCLUDEPATH += xxxxxx/include
LIBS += -L"xxxx/lib" -lqtmqtt

The page do not seems to call it a module but I could be wrong.

Jorgen · wrote on 31 Jan 2018, 19:14

You should load it or bind it to your project like @mrjj said.

btw. qtmqtt repository: I had some issues on building. After fixing that it worked - but is really in a early state. There is no support for proxy - so if you are behind a company proxy, there is no way to use the official MQTT client. Also the broker is just in work and not working yet.
Hope they will continue work on here, because I want to use a official module...

alphaT · 1 Feb 2018, 08:37

@mrjj
yep, it's all C++ file but how can I organize the folder in QT like that?

I search a lot, but I have only one answer in stackoverflow .

jsulm · A alphaT 1 Feb 2018, 08:28

@alphaT Just create all these directories put the files there and edit your pro file to point to the files. Like:

SOURCES += src/main.cpp

alphaT · 1 Feb 2018, 09:12

thank for fast reply @jsulm , where can I create these directories?
I try to Add Existing Directory, but it doesn't seem to work.

jsulm · A alphaT 1 Feb 2018, 09:08

@alphaT You can do it with any file manager on in a terminal

alphaT · wrote on 2 Feb 2018, 16:54

Thank all of you for your help.

INCLUDEPATH += ~/qmqtt/src/mqtt
LIBS += -L"~/qmqtt/src/mqtt" -lqmqtt

I just add two line to .pro file like you say above, and it works.

lorn.potter · 3 Feb 2018, 05:06

If you want the Qt Mqtt module that Qt Company is developing, that is here:
http://code.qt.io/cgit/qt/qtmqtt.git/

You need to clone: git://code.qt.io/qt/qtmqtt.git

This does install a module called 'mqtt'

alphaT · 3 Feb 2018, 07:07

@lorn.potter did you complie that source?
I try to complie it, but it's report error...

lorn.potter · 2 Mar 2018, 08:35

@alphaT Yes, I do compile that. I just did on Mac, with Qt 5.10

alphaT · wrote on 3 Feb 2018, 14:29

@lorn.potter 5.10 is the latest version?
I am using an older version, let me try QT 5.10.

alphaT · 5 Feb 2018, 06:58

@lorn.potter ops, still error too.

jsulm · A alphaT 4 Feb 2018, 04:08

@alphaT It looks like you're building with Qt which is delivered by your Linux distribution (/usr/include/qt5).
I guess you simply called qmake from command line, right?
You should use complete path to qmake from Qt you installed:

~/Qt/5.10.0/gcc_64/bin/qmake

Andarang · wrote on 8 Jun 2020, 11:12

It's been a while but I experienced some of the issues described here and a few other forums. Just for whoever stumbles upon this issue, there is a small thing I overlooked when getting the source code from GitHub, namely:

If you clone from the GitHub repo, don't forget to check out a release version!

Current release is v5.15.0, but I was working from the dev branch, which caused a bunch of errors when compiling. After checking out release v5.15.0 everything suddenly worked.

Jari Koivuluoma · 14 May 2021, 06:05

@lorn-potter How exactly do I compile this? I am a total newbie on these things. I'm using MSVC 2015 65. I cloned the repo and I opened the terminal in that folder, ran vcvars64.bat and tried qmake but it just gave me the instructions. Should there be a *.pro file in the directory.

jsulm · wrote on 14 May 2021, 06:05

@Jari-Koivuluoma Did you checkout Qt5 branch? If you check https://code.qt.io/cgit/qt/qtmqtt.git/tree/?h=5.12 you will see that there is a pro file. I guess you are on master branch, which is Qt6 and based on CMake.

Jari Koivuluoma · wrote on 24 May 2021, 15:11

Thanks, I had to study how to clone a specific branch. I just mistakenly assumed that the cloning link was automatically generated when I changed the branch. From there it went without a hitch.