micro-ROS
app-colcon.meta vs colcon.meta
This is not really an issue, but more to document what I found out after spending a lot of time having compilation errors.
A lot of the online documentation mentions the need for a file named colcon.meta, eg to use a different transport mechanism. Not much of the documentation mentions a file named app-colcon.meta.
Renaming my colcon.meta to app-colcon.meta solved my compilation problem relating to RMW_UXRCE_TRANSPORT_CUSTOM not being defined.
Both shall be used as you can see here:
https://github.com/micro-ROS/micro_ros_espidf_component/blob/dd5108214f747780ac401ab50a2b6ae97f1480fc/libmicroros.mk#L97
In that sense, colcon.meta is intended to configure the library, and app-colcon.meta is a sort of override for application-specific configurations in the number of entities (like this)
Make sure you clean the library completely before modifying it and changing colcon meta parameters.
Yes, of course. My point is that there is documentation out there that specifies colcon.meta in an application, not in the library. I initially had a colcon.meta, inherited from a previous developer, that worked with the galactic version. When I changed to humble, it was complaining about the transport not being configured. Changing the file to app-colcon.meta fixed it.
Yes, systematically was doing clean-microros, clean and fullclean.
AFAIK the only documentation that this package has is its own README.
And you are right, app-colcon.meta is not documented there.
Contributions are welcomed, please feel free to open a PR to include a paragraph mentioning it.