[ROS Q&A] 155 - How to use callback function in ROS Subscriber

This video tries to answer the following question found in the ROS Answers forum

In the video, we'll show how to handle and work with callback functions in a ROS Subscriber.

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[demetcanpolat]

How can we get the variable from the callback to use it another function?

[khalilshamus]

thank you for the video, but what if we want to publish this data in another topic on the same time (subscribe and publish)

[Skarpur]

Very helpful video, thank you very much :)

[vaggeliszikopis]

Great video. But how can i return something from my callback function ? and where is it gonna be returned ?

[nurakhyarnordin]

how do i want to subscribe TWO or more topics?
how can i use the messages coming from callback to use as in input into my programming?

[JoshKindhart]

couldn't focus on the lesson over all of the lip smacking sounds

[rezahamzeh]

why do you make so much annoying noise with your mouth swallowing your mouth water! Didn't even like to watch !!!!