Simple pulse counter which sends data over MQTT

• This counter uses interrupts on 2 pins - I have two water meters attached to ESP8266 via simplest LM393 comparator circuit.
• It is "talk-only" client.
• It sends out data every 60 seconds by default.
• It keeps adding pulses until succesful connection.

MQTT Message consists of

   P1, P2 - number of pulses counted since last succesful connection to server
   Sec - period during which we collected P1 and P2, seconds. 
   Per - number of base periods we collected data for. >1 if we failed to connect to server last time
   Up  - ESP8266 uptime

Copyright (C) 2016 Anton Viktorov latonita@yandex.ru

This library is free software. You may use/redistribute it under The MIT License terms.