Custom Callback Function - HUI Handshake

[fred-rabelo]

Hello everyone!

Since i use Pro Tools i am stuck with HUI, and i was wondering if it would be possible to create Custom Callback functions.

The goal would be to implement the HUI Handshake/ping without building an extra Interrupt.
My idea is to have the GenericSelector trigger a Note On response.

The HUI (or Pro Tools) Handshake works with the DAW sending every 800ms or so the ping msg:
a Note On event on channel 0, note 0(c-2), vel 0 [HEX 90 00 00]
and expecting a reply of:
Note On, Ch 0, note 0 (c-2), vel 127 [HEX 90 00 7f]

I believe a problem could also come from the the Note on event at Vel 0, that as far as i understood would not considered a note on event...

Would it possible? or does the Callback only allows for changing a pin state?
Any ideas or literature on how to make this happen?

Thanks very for much for the great library! Finally got it working on the feather RP2040 :)