serial_listener.py

#!/usr/bin/python
import serial
ser = serial.Serial('/dev/ttyUSB1')
ser.flushInput()
ser.flushOutput()
while True:
  data_raw = ser.readline()
  print(data_raw.rstrip('\n'))

serial_transfer.py

#!/usr/bin/python
from serial import Serial
from time import sleep
ser = Serial("/dev/ttyUSB0")
ser.write(open("/etc/hosts","rb").read())
ser.close()

$ base64 /dev/urandom | head -c 1024000 > file.txt