Re: [mosquitto-dev] Building 2.0.18 with thread support - delayed topic

[Roger Light <roger@xxxxxxxxxx>]

Hi Elodie,

It's only the "mosquitto_pub -l" mode that makes use of threads, mosquitto_sub doesn't use them, so your test likely doesn't indicate they are working and your code is not.

I have just tested on Windows using "mosquitto_sub -t '#' -v" and "mosquitto_pub -t test -l", then typing lines on the mosquitto_pub command line. Each line was received straight away on the subscriber.

This was using the build from https://github.com/eclipse/mosquitto/actions/runs/8861639343 - for some reason you have to be logged in to github to be able to download it. The version number shows as 2.0.18, but there are a few extra fixes not in 2.0.18.

Regards,

Roger

On Thu, 11 Apr 2024, 09:28 Elodie SALZEMANN via mosquitto-dev, <mosquitto-dev@xxxxxxxxxxx> wrote:

Greetings,

 

I'm seeking your suggestions regarding an issue I've encountered.

 

I have compiled mosquitto version 2.0.18 with pthread and followed the workflow outlined below.

However, upon integrating the x64 release DLL, lib, and include files into my project. Then, Loop_start successfully does not return the code MOSQ_ERR_NOT_SUPPORTED.

However, I encountered an issue with the delayed sending of topics. Despite intending to send a topic (with QoS 2) every second, all messages are sent simultaneously each minute. Additionally, when publishing from a client to my software (neither in MQTT Explorer), the message arrives after a minute, hinting at a potential timeout problem.

 

Interestingly, when using mosquitto_pub.exe and mosquitto_sub.exe, the published message is promptly received in the mosquitto_pub terminal. However, I do not receive it directly in my software.

Is this indicative of a problem with my mosquitto build?

 

Prior to compiling with pthread, I attempted to implement my own thread to handle the loop call every 10ms. However, I encountered sporadic failures during publishing with MOSQ_ERR_ERRNO and unknown reasons. Additionally, the loop occasionally failed with MOSQ_ERR_ERRNO or other error codes, despite successful reconnections. Any insights or suggestions would be greatly appreciated. 😊

 

Regards,

 

Elodie

 

Building workflow:

 

Install VCPKG

Clone from https://github.com/microsoft/vcpkg

bootstrap - vcpkg.bat

vcpkg install pthread:x86-windows

vcpkg install pthread:x64-windows

Set VCPKG in VisualStudio :

set VCPKG_ROOT="C:\path\to\vcpkg"

set PATH=%VCPKG_ROOT%;%PATH%

vcpkg integrate install

 

Dowload OpenSSL x64 and x86

Download mosquitto source

Configure and Generate VS project

Use Cmake-GUI

• Configure on win32

Add entry: CMAKE_HAVE_LIBC_PTHREAD BOOL, TRUE

Uncheck: Documentation

Configure OpenSSL entries

C:/Program Files/OpenSSL-Win64/include

C:/Program Files/OpenSSL-Win64

Notes: LibEAY becomes LibCrypto

C:/Program Files (x86)/OpenSSL-Win32/lib/VC/x86/MDd/libcrypto.lib

C:/Program Files (x86)/OpenSSL-Win32/lib/VC/x86/MD/libcrypto.lib

           SSLEAY becomes LibSSL

C:/Program Files (x86)/OpenSSL-Win32/lib/VC/x86/MDd/libssl.lib

C:/Program Files (x86)/OpenSSL-Win32/lib/VC/x86/MD/libssl.lib

Use MD and MDd compil options

Configure CMAKE and then build.

Rebuild on Visual Studio

• Configure on x64

Configure CMAKE and then build.

Rebuild on Visual Studio

 

 

Elodie Salzemann

Ingénieure développement logiciel

 

EDAP TMS

4, rue du Dauphiné - 69120 Vaulx-en-Velin, FRANCE

Tel. +33 (0)4 72 15 31 50 - Fax +33(0)4 72 15 31 51

 

www.edap-tms.com

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