#!/usr/bin/env python

# https://forum.arduino.cc/index.php?topic=92457.msg2803014#msg2803014

import time
import serial.tools.list_ports
import serial
import signal # For trapping ctrl-c or SIGINT
import sys # For exiting program with exit code

def SIGINT_handler(signal, frame):
        print('Quitting program!')
        ser.close()
        sys.exit(0)

signal.signal(signal.SIGINT, SIGINT_handler)

port_names=[]
a=serial.tools.list_ports.comports()
for w in a:
    port_names.append(w.device)

port_names.sort()
print('\nDetected the following serial ports:\nDon\'t choose /dev/ttyAMA0.')
i=0
for w in port_names:
    print('%d) %s' %(i,w))
    i=i+1
total_ports=i # now i= total ports

user_port_selection=input('\nSelect port: (0,1,2...)')
if (int(user_port_selection)>=total_ports):
    exit(1) # port selection out of range

ser=serial.Serial(port=port_names[int(user_port_selection)],baudrate=9600,timeout=1)

# ser=serial.Serial("COM1",baudrate=9600,timeout=10)
while(1):
    mycmd=ser.read()
    if (len(mycmd)>0):
# 10800 is GMT+3
        epoch='T' + str(int(time.time()) + 10800) + '\n'
        ser.write((epoch).encode())
        print (str(epoch))