Protocol

Messages from App to Gun:

RUN: start sensor readings
STP: stop sensor readings
RST: reset positions
CAL: calibrate gyroscope to rest position
GET: send status once (trigger, position, and mode)

Messages from Gun to App:

RUN OK: answers a RUN request
STP OK: answers a STP request
RST OK: answers a RST request
CAL OK: answers a CAL request
POS: position update
TRG ON: trigger on event
TRG OFF: trigger off event
RFI ON: rapid fire on event
RFI OFF: rapid fire off event
ERR: something went wrong

Mapping

Mode 1 (single shot):

X: pitch on trigger / pitch bend while trigger is on or CC1
Y: CC2
Z: CC3

Mode 2 (rapid fire):

X: pitch or CC1
Y: CC2
Z: CC3