[fpc-pascal] MQTT package for freepascal/lazarus?

[Koenraad Lelong]

Hi,

FWIW,
I'm using MQTT via cmd-line. I.e. I call
  ExecuteProcess(MQTTExec,MQTTStrArr);
while MQTTExec is /usr/bin/mosquitto_pub

That's on a linux-server.


Op 20/10/2022 om 15:57 schreef Bo Berglund via fpc-pascal:
> On Thu, 20 Oct 2022 11:11:17 +0200, Bo Berglund via fpc-pascal
> <fpc-pascal at lists.freepascal.org> wrote:
> 
>> On Tue, 11 Oct 2022 19:42:26 +0200 (CEST), Karoly Balogh via fpc-pascal
>> <fpc-pascal at lists.freepascal.org> wrote:
>>
>>> Hi,
>>>
>>> On Tue, 11 Oct 2022, Bo Berglund via fpc-pascal wrote:
>>>
>>>> I am looking for a pascal implementation of the MQTT protocol.
>>>> I could not find anything inside Lazarus' OnLinePackageManager.
>>>>
>>>> Is there something like that available?
>>>
>>> I made a front-end Pascal library, and and Object Pascal wrapper for
>>> libmosquitto a couple of years ago. It's available here. It's know to work
>>> on Linux, Windows and macOS at least. It's against libmosquitto 1.x. Not
>>> sure if 2.x got released meanwhile. I can update things if needed. (Pull
>>> requests are welcomed.)
>>>
>>> It's available here:
>>> https://github.com/chainq/mosquitto-p
>>
>> Well, the version of the mosquitto broker server that gets installed on my
>> RaspberryPi4 is:
>>
>> $ mosquitto --version
>> Error: Unknown option '--version'.
>> mosquitto version 2.0.11
>> mosquitto is an MQTT v5.0/v3.1.1/v3.1 broker.
>>
>> So this is what I have to communicate with as a client.
>>
>> I need to be able to publish as well as subscribe to topics.
>>
>> In the Lazarus forum I have seen people having problems with this when they use
>> various FPC packages while the native command line works OK (on Linux), probably
>> because they are using old packages not updated for the changes made in MQTT in
>> recent years.
>>
>> So this is why I am asking if there is some MQTT client package available for
>> FPC/Lazarus that complies to the updated protocols?
> 
> I found this on the Lazarus forum:
> https://forum.lazarus.freepascal.org/index.php/topic,54397.msg435050.html#msg435050
> 
> Not a poackage, but rather advice on how to utilize binary "drivers" installed
> on the system via translated header files. Not optimal, but might be doable
> anyway.
> 
> I will try that path going forward, just now dealing with the MQTT source
> devices.
> 
>