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addCallback usage

I want to use addCallback to execute one Callback when I am inside another Callback. I don't know how to use it. Is there any available example?

Do you know How can I achieve my goal?

Thanks

addCallback usageTopic reading inside a callback

I want to use addCallback to execute one Callback when I am inside another Callback. I don't know how to use it. Is there any available example?[EDIT]

Do you know How can I achieve have changed my goal?question because I think what I am trying to do is bit different from what was explained here before.

ThanksI have a Callback and I need to read a different topic inside this callback. I don't know if it is possible, but I have to ensure that some part of the code is only executed if the other topic has a particular value.

Any case, I don't know if I can read a topic or execute a particular Callback while I am just executing one callback

Thank you.