zwave_parse.py

import subprocess,time
import shutil
import time

#Number of lines to tail
NUMLINES_TAIL="1000"
FILE_PATH="/home/nipun/Desktop/OZW_log.txt"
SLEEP_TIME=20

while True:
	
	#Calling the process and doing a GREP to get only the relevant rows from the output returned
	p = subprocess.Popen('tail -'+NUMLINES_TAIL+" "+FILE_PATH, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
	output= p.stdout.readlines()
	for line in output:
		if 	"Received Meter report" in line:
			fields_in_line=line.split(" ")
			print "Time:",fields_in_line[0]+" "+fields_in_line[1]
			print "Node:",fields_in_line[2]
			print "Power:",fields_in_line[9]
			
	time.sleep(SLEEP_TIME)