import serial
import os
import sys

fname = sys.argv[1]

ser = serial.Serial('/dev/ttyAMA0', 115200)

i = 0

with open(fname, 'rb') as f:
    b = ser.read()
    if (b == b'!'):
        our_byte = f.read(1)
        ser.write(our_byte)
        print(f"{i} / 131072 bytes", end='\r')
    i += 1

ser.close()