subscribe directly to topics to avoid timing and namespace issues.

[cesar-lopez-mar]

When the merger is launch together with the lasers nodes, it did not subscribe to the topics. Also not when the laser nodes were launched under a namespace. The problem was created because some checks are done if the topics exists before subscribing. That is not needed since ROS takes care of that, subscribing to the topics when they appear (even if they do later than the merger). So a simpler way is just to subscribe directly and the previous issues are solved.

[iandresolares]

Hello,
I'm having issues with the multi merger node, it isn't subscribing to the topics when it should unless I execute the node seconds after all the other nodes when the laser topics are for sure being published. I think my problem is the same as yours and even though your changes look good I can't make it to work, did someone else have this persistent issue and know have to solve it?
Thanks.

[JackFrost67]

refs #7 we can't really trust the user