#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# wiki.binefa.cat
#
# https://pymodbustcp.readthedocs.io

from pyModbusTCP.client import ModbusClient # sudo pip3 install pyModbusTCP
from time import sleep
from sys import argv,exit

SENSOR_IREG = 100 #LDR at ESP8266's code

if len(argv) != 2:
	print("\nHow to use:\n\npython3 %s 174.105.0.63\n\nChanging 174.105.0.63 by ModBusTCP device IP"%argv[0])
	exit(1)

c = ModbusClient(host=argv[1], auto_open=True, auto_close=True)
c.port(502)
c.open()

while True:
	try:
		regs = c.read_input_registers(SENSOR_IREG, 1)
		print(regs[0])
		sleep(1.7)
	except KeyboardInterrupt:
		print("\n%s has been stopped."%argv[0])
		break
exit(0)