Help using firmata on arduino mega and bluetooth circuit

Hello, I'm having the next problem using arduino mega with a program in python:
I want to make an arduino smartHome, controlled using an app, and by voice using Firmata with the pc microphone, because I don't have acces to a arduino voice circuit.
When I use either the app or the voice controll separatedly, there are no issues, but I when I try to use them together, neither of them work. Is there a guide on how to use both serial ports at the same time?

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