PCA9685 Servo PWM numbers to joint:
PWM_0: Front Left Shoulder
PWM_1: Front Left Upper-Limb
PWM_2: Front Left Leg (Lower-Limb)
PWM_3: Front Right Shoulder
PWM_4: Front Right Upper-Limb
PWM_5: Front Right Leg (Lower-Limb)
PWM_6: Rear Left Shoulder
PWM_7: Rear Left Upper-Limb
PWM_8: Rear Left Leg (Lower-Limb)
PWM_9: Rear Right Shoulder
PWM_10: Rear Right Upper-Limb
PWM_11: Rear Right Leg (Lower-limb)