led.py

import time
import sys
import os
from time import sleep
from gpiozero import LED
red_led = LED(17)
import json
import urllib2

ip = '10.0.110.129'
host = 'http://' + ip  + ':3000'
req = urllib2.Request(host + '/api/v1/usage')
req.add_header('Content-Type', 'application/json')
data = {'in_use':True}
response = urllib2.urlopen(req, json.dumps(data))

#if command == "start":
#	red_led.on()
#else:
#	red_led.off()
#sleep(3)

path = '/home/pi/mmal/event.log'

def alive(threshold):
	current_time = time.time()
	file_time = os.stat(path).st_mtime
	file_age  = current_time - file_time
        print(file_age, threshold)
        if file_age > threshold:
        	return False
	else:
		return True 

while True:
  sleep(1)
  status = open(path).read().rstrip()
  print("status", status, red_led.is_lit)
  if status == "start" and red_led.is_lit == False:
	red_led.on()
  elif status == "end" and red_led.is_lit == True:
        red_led.off()
  else:
      print("ok", status, red_led.is_lit)

  data = {'in_use':(status == 'start')}
  try:
    response = urllib2.urlopen(req, json.dumps(data))
  except Exception: 
    print("Cannot connect to URL endpoint")
    pass