Hello,
while playing with the beta wanted to create a callback on two topics.
In ROS it is possible through the message_filters package e.g.

  message_filters::Subscriber<Image> image1_sub(nh, "image1", 1);
  message_filters::Subscriber<Image> image2_sub(nh, "image2", 1);
  TimeSynchronizer<Image, Image> sync(image1_sub, image2_sub, 10);
  sync.registerCallback(boost::bind(&callback, _1, _2));

i don't know if this is possible in ROS2 yet? I couldn't find anything in the demos.





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