Any mosquittopp users on Linux here?

[Josef Moellers]

I have written a small Qt program which displays a set of topics
subscribed from a mosquitto broker. At present, the program uses
libmosquitto, but I'd like to make it use libmosquittopp (it is also a
learning exercise).
The set of topics is not static, the topics are passed on the command
line, so I need a means to hand this set (forged into a QStringList) to
the on_connect() method in order to subscribe to all the topics given.

There is the user_data_set(void *userdata) method in the class
mosquittopp but it only passes the "userdata"-pointer to the underlying
mosquitto code. Any callback specified by
mosquitto_connect_callback_set() will then get this pointer but not the
on_connect() method!

Any hints?

Thanks,
Josef

[Öö Tiib]

Very interesting. We are here on comp.lang.c++ discussing C++
language itself. With C++ it is possible to integrate anything with
anything but from your post it is not very clear what the issue is.
Is with mosquitto or with Qt or with your own C++ code?

To difficulties with mosquitto you perhaps get best hints from
https://groups.google.com/forum/#!forum/mqtt

To difficulties with Qt you get perhaps best hints at
https://forum.qt.io

If it is your own code that causes trouble then we can likely help
but can you give us illustrating example of the problem without
using neither Qt nor mosquitto?

[Josef Moellers]

On 30.11.2017 17:32, Öö Tiib wrote:
> On Thursday, 30 November 2017 17:37:51 UTC+2, Josef Moellers wrote:
>> I have written a small Qt program which displays a set of topics
>> subscribed from a mosquitto broker. At present, the program uses
>> libmosquitto, but I'd like to make it use libmosquittopp (it is also a
>> learning exercise).
>> The set of topics is not static, the topics are passed on the command
>> line, so I need a means to hand this set (forged into a QStringList) to
>> the on_connect() method in order to subscribe to all the topics given.
>>
>> There is the user_data_set(void *userdata) method in the class
>> mosquittopp but it only passes the "userdata"-pointer to the underlying
>> mosquitto code. Any callback specified by
>> mosquitto_connect_callback_set() will then get this pointer but not the
>> on_connect() method!
>>
>> Any hints?
>
> Very interesting. We are here on comp.lang.c++ discussing C++
> language itself. With C++ it is possible to integrate anything with
> anything but from your post it is not very clear what the issue is.
> Is with mosquitto or with Qt or with your own C++ code?

It is actually with the mosquitto code. I searched the list of
newsgroups my provider has and it had nothing that adressed this issue,
so I tried here. I'll go where you told me to go:

>
> To difficulties with mosquitto you perhaps get best hints from
> https://groups.google.com/forum/#!forum/mqtt

Sorry for the inconvenience,

Josef