Hey,
I tested this code with my sensor and I'm getting the midi data in hairless and in my IAC driver.
When I test this in Ableton the MIDI comes in but I can't play an MIDI instrument.
My preferences are correct, my track is armed, monitor is on..
I see in hairless that the data is on controller 7 but it comes in ableton on channel 1 so I don't think that's the problem.
Tested this in Qlab and I can trigger a song so it's really in Ableton I guess.
Thanks, Wout