#!/usr/bin/env python

# Import Libraries
import socket
import os
import glob
import Adafruit_BBIO.GPIO as GPIO
import datetime
from datetime import *
import time
from time import time

server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind(("192.168.0.20",5000))
server.listen(5)

# Finds the correct device file that holds the temperature data
base_dir = '/sys/devices/w1_bus_master1/'
device_folder = glob.glob(base_dir + '22*')[0]
device_file = device_folder + '/w1_slave'

# A function that reads the sensors data
def read_temp_raw():
  try:
    f = open(device_file, 'r') # Opens the temperature device file
    lines = f.readlines() # Returns the text
    f.close()
  except:
    lines=""
  return lines

# Convert the value of the sensor into a temperature
def read_temp():
  lines = read_temp_raw() # Read the temperature 'device file'

  # While the first line does not contain 'YES', wait for 0.2s
  # and then read the device file again.
  while lines[0].strip()[-3:] != 'YES':
    time.sleep(0.2)
    lines = read_temp_raw()

  # Look for the position of the '=' in the second line of the
  # device file.
  equals_pos = lines[1].find('t=')

  # If the '=' is found, convert the rest of the line after the
  # '=' into degrees Celsius, then degrees Fahrenheit
  if equals_pos != -1:
    temp_string = lines[1][equals_pos+2:]
    temp_c = float(temp_string) / 1000.0
#    temp_f = temp_c * 9.0 / 5.0 + 32.0
#    return temp_c, temp_f
    return temp_c

print "TCP server listening on port 5000"
while 1:
  myclient, address = server.accept()
  print "Connected to ", address

  #confirm connection
  myclient.send("0"+'\r')

  while 1:
    # wait for client data
    data = myclient.recv(512)
    today = datetime.now()
#    print "Received -->"+data+"<-- at "+today.strftime('%H:%M:%S')

    rxTime = today.microsecond/1000+today.second*1000
    if (data == "q") or (data == "qq"):
      print "Closing Connection"
      myclient.close()
      break
    elif (data == 't'):
      t=read_temp()
      newdata=str(t)
      today = datetime.now()
      txTime = today.microsecond/1000+today.second*1000
      print "Received -->"+data+"<-- : "+newdata+"C"
      myclient.send('T='+newdata+'\r')
      print "Acquisition time = "+str(txTime-rxTime)+"mS"
    else:
      newdata=str(float(data)*2)
      print "Converted:" , newdata
      myclient.send(newdata+'\r')

  if (data == "qq"):
    server.close()
    print "TCP server is down"
    break
  else:
    print "TCP server still listening on port 5000"