How to connect to Virtual MIDI host on iOS

I am developing a MIDI controller iOS app. So far I have managed to connect it to GarageBand on my Mac over wifi using NSNetServiceBrowser to find service with type "_apple-midi._udp" and then creating MIDI connection for the found service.

Now I want to integrate my app with Virtual MIDI host app like SampleTank. Googling for a few days, I can't find any examples of how to achive this. I need to get the list of all available MIDI hosts on the device and connect to one.

Could you please give me a direction where to find required info to accomplish my task?

via Chebli Mohamed