Data Sniffer

import serial

import sys

import datetime

import time

if len( sys.argv ) > 1 :

 port_name = sys.argv[1]

 #Open serial port 

 serialPort = serial.Serial(

  port = port_name, baudrate=115200, bytesize=8, timeout=0.1, stopbits=serial.STOPBITS_ONE

 );

 last_time = 0

 current_time = datetime.datetime.now() #get initial date for record file name

 #create initial file

 name_current_file = "REC "

 if(current_time.day < 10):

  name_current_file += "0"

 name_current_file += str(current_time.day)

 name_current_file += "-" 

 if(current_time.month < 10):

  name_current_file += "0"

 name_current_file += str(current_time.month)

 name_current_file += "-"

 name_current_file += str(current_time.year)

 name_current_file += ".txt" 

 f = open(name_current_file, "a")

 serialPort.write(bytearray("X,1\n\r",'ascii')) #Start sniffer 

 while 1: #main loop

  try:  

   if last_time != current_time: #check date to create new record file if new day close current record file and create new record file

    f.close()

    last_time = current_time

    name_current_file = "REC "

    if(current_time.day < 10):

     name_current_file += "0"

    name_current_file += str(current_time.day)

    name_current_file += "-" 

    if(current_time.month < 10):

     name_current_file += "0"

    name_current_file += str(current_time.month)

    name_current_file += "-"

    name_current_file += str(current_time.year)

    name_current_file += ".txt" 

    f = open(name_current_file, "a")

   current_time = datetime.datetime.now() #get updated date 

   line = serialPort.readline() #serial read

   if line:  #save data

    f.write(line.decode('utf-8'))

   time.sleep(0.1)

  except KeyboardInterrupt:

   raise SystemExit  

else :

 print("Please, enter valid serial port")