[14485] Hotfix: clarify -python Fast DDS-Gen option

[JLBuenoLopez]

This PR clarifies that:

• Fast DDS-Gen option -typeobject does not support generation of Python bindings when using at the same time option -python (Generation From IDL To python with "-typeobject" flag results in import error. [14484] Fast-DDS-Gen#114)
• -python option is supported officially in more platforms than Windows currently.

Signed-off-by: JLBuenoLopez-eProsima joseluisbueno@eprosima.com

[swarm59]

Thanks for your clarification.
Let me ask you for a possible related issue:
Is it possible in python to create Contentfilteredtopic, given that type object is not supported ?
Please note that when I try to create a Contentfilteredtopic with python files generated without the -typeobject flag, I achieve the following run time error:
2022-05-05 16:42:13.907 [DDSSQLFILTER Error] No TypeObject found for type VideoTrackerActivateMultiobjectTracking -> Function create_content_filter
2022-05-05 16:42:13.907 [PARTICIPANT Error] Could not create filter of class DDSSQL for expression "(A_referenceNum == %0) -> Function create_contentfilteredtopic
F
where "VideoTrackerActivateMultiobjectTracking" is the reference topic data type name.
Thanks for the support,
Francesco

[JLBuenoLopez]

Hi @swarm59,

You are correct that the standard DDSSQL filter requires that the Type Object is defined in order to work. Otherwise the content filtered topic creation fails as you are seeing. And you are correct, ContentFilteredTopic feature is a really recent addition to Fast DDS library since release v2.5.1. It was being developed at the same time as the Python bindings (which was released almost at the same time), so this feature is still not supported in Fast DDS python bindings. That is the reason why the Fast DDS Python API reference does not include the corresponding section about ContentFilteredTopic. Nevertheless, I agree that the create_contentfilteredtopic python binding should return unsupported instead of failing trying to create the content filtered topic.

[MiguelCompany]

LGTM