Topic reading inside a callback
[EDIT]
I have changed my question because I think what I am trying to do is bit different from what was explained here before.
I 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.
What is addCallback? Do you want to make another subscription or just "do the same thing as a callback would have" - in the latter case: It's just a function that you can call.
I have changed the question because It was totally confusing.