Unknown module(s) in QT: mqtt

Sudhish Kapoor

I have installed Qtmqtt from the open source and i can see the framework folder inside :

ls <path to qt>/Qt/5.15.1/clang_64/lib:  QtQmqtt.framework

When i am trying to inculde this module in QtCreator or building for command line i get the error as:

Project ERROR: Unknown module(s) in QT: mqtt

I am using Qt 5.15 on mac and not able to resolve this issue as i want to try the mqtt module to see if it works. Any pointers here will help.

jsulm

@Sudhish-Kapoor said in Unknown module(s) in QT: mqtt:

I have installed Qtmqtt

How exactly?

Sudhish Kapoor

@jsulm

I have used the following links emqx and also tried with code.qt.io and in both the cases i am not able to find the module Qmqtt.
Also when i am running the commdand

Qt/5.15.1/clang_64/bin/qmake -query QT_INSTALL_LIBS

and check the installed lib directory i am able to see the

QtQmqtt.framework 
QtQmqtt.framework.dSYM

folders but unable to load it with QtCreator and even if i am giving the absolute path of the qmtt directory, i am still not able to compile.

I also tried the steps mentioned in : how-can-i-add-module-mqtt-to-qt
but still getting the same error.

SGaist

Hi,

Can you describe exactly how you built and installed the module ?

Sudhish Kapoor

@SGaist I had checked out the code from emqx and opened into the QtCreator and build it once it was build i used the command line to install.
I might have not done it correctly can you help me with the proper steps to get the mqtt module running as i want to test it thats good for my usage.

SGaist

From the looks of it you mixed the instructions from the official QtMQTT module and that one.

From their doc:

QT += qmqtt

Sudhish Kapoor

@SGaist @jsulm i was able to compile Qt-Mqtt for 5.15 by following this link here where the Qt-Mqtt is cloned using this command

"git clone -b 5.15.2 http://github.com/qt/qtmqtt.git"

post which i was able to build and install mqtt module for my Qt 5.15. Thanks for your help.

SGaist

Great ! Then please mark the thread as solved using the "Topic Tools" button or the three dotted menu beside the answer you deem correct so that other forum users may know a solution has been found :-)

sittikorn

@Sudhish-Kapoor please show me step by step on window desktop again. Thanks

Jagannath

@SGaist I installed QtMqtt in windows 10 and can see QtMqtt.dll inside bin folder. The problem is , QT creator shows unknown module found. I checked in the QT_INSTALL_LIBS Folder too. There is also QTMqtt found. But still not working. Please help

SGaist

@Jagannath where did you get QtMqtt from ?
How exactly did you install it ?

Jagannath

@SGaist Thank you for your reply. I have open-source QT. I am trying to use MQTT in the android application that I am creating. I cloned QtMqtt inside "C:\Qt\5.15.2\Src" folder from

git clone -b 5.15.2 https://code.qt.io/cgit/qt/qtmqtt.git/

After qmake, mingw32-make, mingw32-make install, I checked

qmake -query QT_INSTALL_LIB

at location "C:/Qt/5.15.2/mingw81_64/lib".
I found files named Qt5Mqtt.a, Qt5Mqtt.prl, Qt5Mqtt.dll.debug
I can find QtMqtt folder inside "C:\Qt\5.15.2\mingw81_64\include" folder.
But I couldnt find MQTT on "C:\Qt\5.15.2\android\include" folder.

Jagannath

I found out while replying to your response that I tried to install with qmake at location "C:/Qt/5.15.2/mingw81_64/bin". Instead I changed path variable of qmake to location "C:/Qt/5.15.2/android/lib". Now it compiled. Thank you for your help @SGaist . :D