test-serial-read.py

#!/usr/bin/env python
 
# This test has to run on a Raspberry Pi connected throw a USB
# to serial adapter to a laptop.
 
from __future__ import print_function
 
import time
import serial
 
ser = serial.Serial(
  port='/dev/ttyUSB0',
  baudrate = 9600,
  timeout=0
)
          
while True:
  data = ser.read(9)
  if len(data) > 0:
    print('Got:', len(data), 'data:', data)
 
  time.sleep(0.5)
  print('not blocked')
 
ser.close()