import os
import glob
import time
import cayenne.client

os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')

base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'

# Cayenne authentication info. This should be obtained from the Cayenne Dashboard.
MQTT_USERNAME  = ""
MQTT_PASSWORD  = ""
MQTT_CLIENT_ID = ""

 #The callback for when a message is received from Cayenne.
def on_message(message):
    print("message received: " + str(message))
  # If there is an error processing the message return an error string, otherwise return nothing.

def read_temp_raw():
    f = open(device_file, 'r')
    lines = f.readlines()
    f.close()
    return lines

def read_temp():
    lines = read_temp_raw()
    while lines[0].strip()[-3:] != 'YES':
        time.sleep(0.2)
        lines = read_temp_raw()
    equals_pos = lines[1].find('t=')
    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     if you want use Fahrenheit, modify these lines  
        return temp_c#,temp_f                               this line

client = cayenne.client.CayenneMQTTClient()
client.on_message = on_message
client.begin(MQTT_USERNAME, MQTT_PASSWORD, MQTT_CLIENT_ID)

while True:
  client.loop()
  value=read_temp()
  client.celsiusWrite(5, value)                             #this line
  #client.fahrenheitWrite(5, value)                         this line
  time.sleep(3)