#!/usr/bin/python


#  This script allow the control of the SNOOTLAB expansion board, and is adapted for Intel Edison.
#  3 lines of code were added (LINE ADDED)
#  script has been modified from:
#
#  This script is from the rpisigfox expansion board for Raspberry Pi.
#
#  V1.0 allow only to send regular message on the SigFox Network.
#  syntax is :
#  sendsigfox MESSAGE 
#  where MESSAGE is a HEXA string encoded. Can be 2 to 24 characters representing 1 to 12 bytes.
#  Example : sendsigfox 00AA55BF to send the 4 bytes 0x00 0xAA 0x55 0xBF
# 

import time
import serial
import sys
from time import sleep

#LINE ADDED
import mraa

SOH = chr(0x01)
STX = chr(0x02)
EOT = chr(0x04)
ACK = chr(0x06)
NAK = chr(0x15)
CAN = chr(0x18)
CRC = chr(0x43)

def getc(size, timeout=1):
    return ser.read(size)

def putc(data, timeout=1):
    ser.write(data)
    sleep(0.001) # give device time to prepare new buffer and start sending it

def WaitFor(ser, s, timeOut):
        nbMax = 0
        ser.timeout = timeOut
        currentMsg = ''
        while currentMsg.endswith(s) != True :
            # should add a try catch here
            c=ser.read()
            if c != '' :
                currentMsg += c
            else :
                print 'timeout waiting for ' + s
                return False
            nbMax = nbMax + 1
            if nbMax > 150:
		print 'Timeout expired'
		return False
        return True


print('Sending SigFox Message...')

#LINE ADDED: 0 ie '/dev/ttyMFD1'
uart = mraa.Uart(0)

modem = serial.Serial(
			uart.getDevicePath(),
			baudrate=9600,
        	parity=serial.PARITY_NONE,
        	stopbits=serial.STOPBITS_ONE,
        	bytesize=serial.EIGHTBITS
		)

#LINE ADDED: closing serial before opening it, as otherwise the Edison serial seems to be already open by calling serial.Serial
modem.close()

modem.open()

modem.write('AT\r')

if (WaitFor(modem, 'OK', 3)):
	print('SigFox Modem OK')
else:
	print('SigFox Modem Error')
	modem.close()
	exit()

modem.write("AT$SS={0}\r".format(sys.argv[1]))

print('Sending ...')
if (WaitFor(modem, 'OK', 15)):
	print('OK Message sent')
else:
	print('Error Sending message')
	modem.close()
	exit()

modem.close()