Need help with pymavlink to output pwm

MAVLink
1

i am using this code, how do i define the pins? i connected the servo to every pin and nothing happens… i am using orangecube connected to the pc by usb and the script run without errors.

import time
from pymavlink import mavutil

def set_servo_pwm(servo_n, microseconds):

master.mav.command_long_send(
    master.target_system, master.target_component,
    mavutil.mavlink.MAV_CMD_DO_SET_SERVO,
    0,     
    servo_n + 8, 
    microseconds, 
    0,0,0,0,0 
)

master = mavutil.mavlink_connection(’/dev/ttyACM0’)
master.wait_heartbeat()

for us in range(0, 1900, 50):
set_servo_pwm(1, us)
time.sleep(0.125)
master.recv_match(type=“COMMAND_ACK”,blocking=True)
print (“pix is alive”)

thanks