Voice recognition does not use the Bluetooth microphone / speech.recognize

[tahti]

I am using the example code for voice recognition http://omz-software.com/pythonista/docs/ios/speech.html
Everything works fine but when I use my Bluetooth headset, the voice and microphone is automatically switched to the one of the phone instead of using the one of my headset.
What is the way to force the program to use my headset instead?
I started to investigate and is there something to do with setting the audioSession category?
What would be the right way.
Many thanks to help as I do not seem to find the solution on my own.

Regards,

[amelbeabk]

After using Now/Google Search voice recognition I'm just blown away by how bad the bluetooth recognition is. I know the search/now recog sends the data to a server to be processed, I'd happily wait the extra time for the time accuracy on my bluetooth commands. Kodi nox