4.0.7 20170319
* Increased Sonoff Led PWM frequency from 432 to 1000
* Fix possible watch dog reboot after changing module type on web page
* Fix reporting of GPIO usage from web page
* Fix Sonoff Led blank during firmware upgrade
* Fix Sonoff Led flicker and possible flash corruption by using latest
Arduino-esp8266 versions
* of pwm core files included in sonoff library (#211)
* Add PWM output control with commands PWM1 to PWM5 using user
selectable GPIOs (#211)
* Fix exceptions due to low values of commands HlwPCal (10000), HlwUCal
(1000) and HlwICal (2500) (#223)
* Add Switch state to sensor status (#227, #233)
* Add user configuarble GPIO to module Sonoff Touch (#228)
* Add define WEB_PORT to user_config.h to change default web server port
from 80 (#232)
* Fix failed Ota Firmware upgrade started from Web page (#235)
4.0.2 20170308
* Restore correct seriallog level after Serial logging was disabled
* Add simple dimmer slider to Sonoff Led web page
* Reduced root webpage size by 31%
* Expand Status 2 with Build date/time and core version
* Fix webserver redirection when not in WifiManager mode (#156)
* Add command ButtonRestrict On/Off to restrict access to button hold
and button multi press options above 2 (#161)
* Fix DS18S20 negative temperature readings (#165)
* Fix crlf compilation error due to bad syntax (#144, #167)
4.0.1 20170305
* Fix char default sizes and set MESSZ to 360 (#143)
* Fix SerialLog setting status
* Disable syslog when emulation is active
* Add DS18B20 web page display refresh
4.0.0 20170303
* Add define to remove config migration code for versions below 3.0 (See
Wiki-Upgrade-Migration path)
* Free memory by switching from String to char[]
* Raised Sonoff Led PWM frequency from 200Hz to 432Hz in search of
stability (hardware watchdog timeouts) (#122)
* Increase message size and suggested minimum MQTT_MAX_PACKET_SIZE to
512 (#114, #124)
* Remove runtime warning message regarding MQTT_MAX_PACKET_SIZE too
small as it is now moved to compile time (#124)
* Fix possible panics with web console and http commands while UDP
syslog is active (#127)
* Add optional static IP address (#129)
* Add define ENERGY_RESOLUTION in user_config.h to allow user control
over precision (#136)
3.9.22 20170228
* Update web console
* Fix Status 4 JSON message
* Add Exception info during restart if available
* Add osWatch service to detect loop hangs that might happen during
(OTA) upgrades
* Add WiOn support for relay and switch only (#82, #102)
* Allow for user specified relay count up to four in sonoff_template.h
(#109)
* Add support for HTU21 compatible I2C sensors SI7013, SI7020 and SI7021
(#118)
* Add NodeMCU or Wemos configuration option (#119)
3.9.15 20170213
* Change JSON float values from string to number according to
http://json.org (#56)
* Add support for exs latched relay module
https://ex-store.de/ESP8266-WiFi-Relay-V31 (#58)
* Add support for inverted relays
* Changed MAX_LOG_LINES from 70 to 60 to preserve memory
3.9.11 20170204
* Fix command I2Cscan
* Fix not allowed spaces in Topic, ButtonTopic and SwitchTopic
* Make all TELEMETRY, STATUS and COMMAND message topics unique (#4)
* Advertise command topic to be used by iobroker (#299)
* Fix butten (non)detection if no GPIO_KEY1 is defined (#13)
* Change WeMo serialnumber from 7 decimal chars to 8 hexadecimal chars
(#18)
* Update web page with Build Date/Time, Emulation and mDNS Discovery and
Advertise information (#21)
3.9.11 20170204
* Fix command I2Cscan
* Fix not allowed spaces in Topic, ButtonTopic and SwitchTopic
* Make all TELEMETRY, STATUS and COMMAND message topics unique (#4)
* Advertise command topic to be used by iobroker (#299)
* Fix butten (non)detection if no GPIO_KEY1 is defined (#13)
* Change WeMo serialnumber from 7 decimal chars to 8 hexadecimal chars
(#18)
* Update web page with Build Date/Time, Emulation and mDNS Discovery and
Advertise information (#21)
3.9.9 20170130
* Add command status 10 showing sensor data
* Fix hlw status messages if hlw is disabled
* Remove GPIO07 and GPIO08 from user selectable (#5)
