It will auto-detect and send to all MIDI connected devices at the moment, there is no way to select a specific interface in the app. I’m using the AudioKit library for MIDI connection so it should be rock solid.
You have the camera kit connected to the iConnect which is connected to the OT?
What happens when you connect the camera kit / hub before starting the app? Any difference? I wasn’t rescanning interfaces if you connected after starting the app, but I fixed that today (for the next update).