SERVO1_FUNCTION = 73

Excuse me when I set up to Skid Steering
For “Skid steering” vehicles (like R2D2) these parameters values will need to be set:

SERVO1_FUNCTION = 73 (Throttle Left)
SERVO3_FUNCTION = 74 (Throttle Right)
As a result, esc did not receive PIXHAWK.
Message, thank you