'I would like to ask how to communicate Aos and Ios to Ros and Could you also tell me the difference between Ros and Ros2?

My System is ubuntu 18.04Lts

nothing but

I want to use the Pub Sub function to communicate Ros in Android studio, but I don't know how I also received Android_core and tried it, but it was so long ago that I don't know how many versions I should use. Is there anyone who can tell me

and

I want to communicate with Ros through Swift or Objective-c in IOS. If you don't mind, I'm wondering if there's anyone who can tell me.

And can you tell me the difference between Ros and Ros2?



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