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/* 5.6.1 20170818
* Change module list order in webpage
* Fix Sonoff T1 1CH and 2CH configuration (#751)
*
* 5.6.0 20170818
* Fix Sonoff Pow intermittent exception 0
* Change Sonoff Pow sending Domoticz telemetry data only
* Add Ai-Thinker RGBW led (AiLight) (experimental)
* Add NeoPixelBus library to Sonoff Led for Hue support
* Add user configurable GPIO4 and GPIO5 to module Sonoff Bridge
* Add Sonoff B1 RGBCW led support with command Color RRGGBBCCWW (#676)
* Add command CT 152..500 to Sonoff Led and Sonoff B1 to control Color Temperature
* Add Cold-Warm slider to web page for Sonoff Led and Sonoff B1
* Add CT parameter to Hue
* Add Sonoff T1 support (#582)
* Add AnalogInput0 if configured as Analog Input to webpage (#697, #746)
* Add command SetOption14 0|1 to enable interlock mode (#719, #721)
* Fix Mitsubishi HVAC IR power controll (#740)
*
* 5.5.2 20170808
* Extent max number of WS2812 pixels from 256 to 512 (#667)
* Add OTA handling if server responds with no update available (#695)
* Removed undocumented command FlashMode (#696)
* Fix compile time error message due to increased message buffer size (#703)
*
* 5.5.1 20170805
* Fix Sonoff Rf Bridge issues
* Add Sonoff RF Bridge MQTT messages on received and learned RF signal
* Add command VoltRes 0|1 to select voltage resolution to 0.1 V (#654)
* Add averaging to Analog input (#686)
* Add Energy tele data on Sonoff Pow Threshold change (#688)
* Fix inconsistent property names in Messages (#690)
*
* 5.5.0 20170730
* Reduce code space by removing the following commands as they are replaced by SetOption alternatives:
* SaveState = SetOption0
* ButtonRestrict = SetOption1
* Units = SetOption2
* MQTT = SetOption3
* MQTTResponse = SetOption4
* TempUnit = SetOption8
* Smoothing WS2812 animation poll, invert fade speed and max allowed wakeup time down to 3000 seconds
* Fix initial button press detection
* Add support for Sonoff RF Bridge 433 using command RfKey
* Fix regression from 5.0.7 by increasing message buffer size from 360 to 368 to accomodate 4 x DS18x20 sensors (#637)
* Add GroupTopic to Topic test when using ButtonTopic/SwitchTopic to send either ON/OFF or TOGGLE (#642)
* Adjust HLW calibration limits to accomodate HuaFan device and add commands HlwPSet, HlwUSet and HlwISet (#654)
*
* 5.4.0 20170725
* Fix command reset regression introduced in 5.2.0
* Increase polling from 0.1 second to 0.05 second
* Add multipress to all buttons
* Fix button 1 double press behaviour on multi relay devices
* Add support for Hua Fan Smart Socket (#479)
* Add support for Sonoff 4ch Pro (#565)
* Add command SetOption13 1 to allow immediate action on single button press
* (disables multipress, hold and unrestricted commands) (#587)
*
* 5.3.0 20170715
* Major Hue rewrite which might introduce Alexa problems. If so, initiate an issue
* Add support for Sonoff Led and BN-SZ01 Ceiling Led brightness control to Hue
* Fix Sonoff Led Power, Dimmer and Color MQTT response (#176)
* Add commands Delay and Backlog to allow multiple commands at once separated by ";" (#593)
* Use default flashmode DOUT to solve restart hangs on esp8285 chips (#453, #598)
* Change Web console column width from 99 to 300 (#599)
*
* 5.2.4 20170703
* Removed flash mode update after selecting different module solving esp8285 related problems
* Add device type flag to sonoff_template.ino
* Change Sonoff Led Wakeup and add support for Sonoff BN-SZ01 Led (#567)
*
* 5.2.3 20170630
* Change Sonoff Led color conversion code
* Fix SetOption12 handling
* Simplify auto configuration upgrade
* Add option Upgrade <version_number> to only upgrade to any higher version (Old PR #213)
* Change FallbackTopic to cmnd/<MQTTClient>/<command> <parameter> bypassing FullTopic and Prefix (#538)
*
* 5.2.2 20170625
* Add configuration SaveAddress to Status 1 and Information Page
* Change Sonoff Led Color conversion from AtoH to strtol
* Fix possible wrong uploads due to configuration overwrites (#542)
* Fix payload negative numbers (#547)
*
* 5.2.1 20170622
* Fix Restore Configuration in case of lower version
* Revert auto configuration upgrade allowing easy upgrade which was removed in version 5.2.0
* Fix config auto upgrade from versions below version 4.1.1 (#530)
*
* 5.2.0 20170619
* Add command SetOption12 1 to disable newly released configuration flash rotate to reduce flash wear
* Fix command CounterDebounce by removing test for active GPIO (#524)
* Add command SetOption33 1..250 to allow user configure POW Max_Power_Retry count (#525)
*
* 5.1.7 20170616
* Prep removal of SetOptions alternatives
* Restore webpage upgrade error messages removed in 5.1.5
* Add hold button functionality to buttons 2 to 4
* Add command SetOption32 1..100 to set Key Hold Time from 0.1 seconds to 10 seconds (#200)
* Allow slashes in Topic, GroupTopic, ButtonTopic and SwitchTopic (#507)
* Changed webpage form actions from post to get and use relative path url (#434, #522)
*
* 5.1.6 20170606
* Shrink code
* Removed online configuration of Domoticz In and Domoticz Out MQTT strings
* Removed commands DomoticzInTopic and DomoticzOutTopic
* Add define KEY_HOLD_TIME to configure button hold threshold before sending MQTT Hold message
* Add command StateText4 to configure button MQTT Hold text (= MQTT_CMND_HOLD)
* Add command SetOption11 0|1 to swap pushbutton single and double press functionality (#200)
* Add command SwitchMode<x> 5 (PUSHBUTTONHOLD) and 6 (PUSHBUTTONHOLD_INV) (#489)
*
* 5.1.5 20170604
* Shrink code in preparation to ESP8266-Arduino 2.4.0-rc1
* Add effect parameter to HUE Device (#464)
*
* 5.1.4 20170601
* Removed pre-compiled versions from repository as they are available within the release
* Changed HUE Device type to color supporting version (#464)
* Fix compile error when BE_MINIMAL is selected (#467, #476)
* Add multiple compiled versions to release using updated Travis script and platformio.ini (#467)
*
* 5.1.3 20170520
* Add Domoticz Counter
*
* 5.1.2 20170519
* Fix Counter/Timer JSON message and update Counter/Timer on webpage
* Fix WS2812 Domoticz related regression issues
*
* 5.1.1 20170517
* Allow command FullTopic in group mode
* Prepare for more use of RTC memory
* Add independant WS2812 led string power control (#386, #390)
* Add command Counter<x> to control up to four GPIO falling edge interrupt counters or timers (#459)
* Add command CounterType<x> to select between pulse counting or pulse timing
* Add command CounterDebounce to select global counter debounce time in mSec
*
* 5.1.0 20170513
* Fix Offline/Removal of retained topic when FullTopic is changed
* Add FullTopic to MQTT Configuration and Information web pages
* Add license model GPLv3 (#188)
*
* 5.0.7 20170511
* Fix possible exception 28 on empty command
* Add command SetOption0 as replacement for SaveState
* Add command SetOption1 as replacement for ButtonRestrict
* Add command SetOption2 as replacement for Units
* Add command SetOption4 as replacement for MqttResponse
* Add command SetOption8 as replacement for TempUnit
* Add command SetOption10 On|Off to select between Offline or Removing previous retained topic (#417, #436)
*
* 5.0.6 20170510
* Remove hyphen in case of a single DHT sensor connected (#427)
* Add command MqttRetry <seconds> to change default MQTT reconnect retry timer from minimal 10 seconds (#429)
*
* 5.0.5 20170508
* Add command FullTopic with tokens %topic% (replaced by command Topic value) and
* %prefix% (replaced by command Prefix<x> values) for more flexible topic definitions (#244)
* See wiki > MQTT Features https://github.com/arendst/Sonoff-Tasmota/wiki/MQTT-Features for more information
*
* 5.0.4 20170505
* Add Sonoff Pow Energy Total up to 40 MWh
* Add command EnergyReset 1|2|3 to reset Energy counters (#406)
* Fix Domoticz Energy logging (#411)
* Add command PowerOnState 4 to keep relay always on and disabling all power control (#418)
*
* 5.0.3 20170504
* Add command SensorRetain on|off to enable retaining of mqtt message tele/sonoff/SENSOR (#74)
* Change WifiConfig timeout from 60 seconds to 180 seconds (#212)
* Change Sonoff Touch command Ledstate functionality by turning led on if power is off (#214)
* Add 4 seconds delay after power on before enabling button to workaround Wemos D1 mini RTS circuit (#380)
*
* 5.0.2 20170503
* Reset SaveData, SaveState and MqttResponse to default values due to rearranging settings
* Moved some settings to flag area
* Add command TempUnit Celsius|Fahrenheit for selecting Celsius or Fahrenheit (#347)
* Add command TempRes 0..3 for selecting Temperature Resolution (#347)
* Add command HumRes 0..3 for selecting Humidity Resolution (#347)
* Add command PressRes 0..3 for selecting Pressure Resolution (#347)
* Add command EnergyRes 0..5 for selecting Energy Resolution (#347)
* Add "TempUnit":"C|F" to sensor JSON output (#347)
* Add support for up to three DHT type sensors each using a different GPIO (#339, #404)
*
* 5.0.1 20170429
* Adjust Sonoff SC messages to prepare for display feature
* Move static data from RAM to Flash
* Fix PowerOnState for some devices not reporting "Power on" state (#284, #380, #383)
*
* 5.0.0 20170425
* Memory status message update
* Fix setting migration to better preserve settings during move (#382)
* Best practice is first doing a Backup Configuration before installing version 5.0.0
* Reset save count after setting move
* Start using new linker script without SPIFFS
*
* 4.2.0 20170424
* Prepare for SPIFFS removal by moving settings to EEPROM area
* Fix compilation error when webserver is disabled (#378)
*
* 4.1.3 20170410
* Add user configuarble GPIO to module S20 Socket and Slampher
* Add support for Sonoff SC (#112)
* Set PWM frequency from 1000Hz to 910Hz as used on iTead Sonoff Led firmware (#122)
* Set Sonoff Led unconfigured floating outputs to 0 to reduce exceptions due to power supply instabilities (#122)
* Add Access Point Mac Address to Status 11 and Telemetry (#329)
* Fix DS18B20 negative temperature readings (#334)
*
* 4.1.2 20170403
* Rename Unrecognised command to Unknown command
* Remove all command lists
* Remove command SmartConfig (superseded by WifiConfig)
* Fix boot loop when selecting module Sonoff 4CH or Sonoff Touch on non ESP8285 hardware
* Add optional support for Toshiba and Mitsubishi HVAC IR control (needs updated IRremote8266 library) (#83, #257)
* Add all configured switches to Domoticz Configuration web page (#305)
* Fix compile error when selecting WS2812 DMA (#313)
*
* 4.1.1 20170329
* Fix default Telemetry for command Prefix3
* Fix webserver Module parameters for disabled select
* Fix sensor status for enabled switches
* Remove Light as alternative for Power (save code space)
* Remove migration option from pre V3 (code cleanup)
* Remove unofficial SPIFFS support (code cleanup)
* Remove command list when unknown command is entered (save code space)
* Rename Status11 json from StatusPWR to unique StatusSTS
* Rename command Gateway to IPAddres2, Subnetmask to IPAddress3 and DnsServer to IPAddress4 (save code space)
* Add Command MqttResponse to select either command or RESULT topic as response (#258)
* Add command StateText1 to StateText3 to assign MQTT_STATUS_OFF, MQTT_STATUS_ON and MQTT_CMND_TOGGLE respectively (#286)
* Remove restart after IPAddress changes (#292)
* Add support for MAX31850 in xsns_ds18x20.ino (#295)
* Fix possible uptime update misses (#302)
*
* 4.1.0 20170325
* Change static IP addresses in user_config.h from list (using commas) to string (using dots)
* Unify display result of commands Modules, Module and Gpios
* Rewrite Module selection web page to bring size down from 18651 to 4319 bytes (!) (#234, #240)
* Add basic support for (Lixada) H801 RGBWW controller (#252)
* Add command Prefix1 to Prefix3 to assign SUB_PREFIX, PUB_PREFIX and PUB_PREFIX2 respectively (#255)
* Add static ip addresses to flash (#262)
* Add commands IpAddress, Gateway, Subnetmask and DnsServer to select static ip addresses (#273)
*
* 4.0.8 20170321
* Fix entering non-numeric webpassword
* Force selection between TLS or Webserver due to memory restraint (#240)
* Allow entering empty string using "0" for selected commands (#242)
* Fix exception when posting commands to web console containing % (#250)
*
* 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)
*
* 4.0.6 20170316
* Fix to better find device by Wifi hostname
* Fix compile error when some I2C devices are disabled
* Add (experimental) support for SHT1X emulating I2C (#97)
* Add ADC to ElectroDragon (#203)
* Add support for Sonoff Dev (#206)
*
* 4.0.5 20170314
* Add command Status 11 to show power status with Vcc if define USE_ADC_VCC is enabled (default)
* Add ADC input to Sonoff SV and Wemos D1 mini - Needs recompile with define USE_ADC_VCC disabled (#137)
* Add MQTT host:port to timeout message (#199)
*
* 4.0.4 20170312
* Add pulse timers for up to 4 relays (#106)
* Fix Sonoff Led power state when dimmer or color is 0 (#176)
* Add command NtpServer<x> to configure up to three NTP servers (#177)
* Delete module User Test as module Wemos D1 mini has same/more user configurable GPIO (#178)
* Add more user configurable GPIO to module ElectroDragon (#183)
*
* 4.0.3 20170309
* Renamed Module NodeMCU to WeMos D1 mini
* Add GPIO1 as user option to some modules
* Add Buttons, Relays and Leds to user configurable options (#159)
* Add description on Module parameters web page to some well known GPIOs (#107, #171)
*
* 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)
*
* 3.9.21 20170224
* Add ajax to web root page and web console (#79)
* Add commands SwitchMode1..4 and enable user switches 2, 3 and 4 (#84, #88)
* Fix MQTT upgrade when webserver is active
*
* 3.9.20 20170221
* Add minimal basic authentication to Web Admin mode (#87)
* Fix Hue and add HSB support (#89)
*
* 3.9.19 20170219
* Sonoff Led: Made GPIO04, 05 and 15 available for user
* Sonoff Led: Add commands Fade, Speed, WakupDuration, Wakeup and LedTable
*
* 3.9.18 20170218
* Fix ledstate 0 to turn off led
* Fix Sonoff Led dimmer range (#16)
* Change Sonoff Led command Dimmer to act on both cold and warm color
* Add Sonoff Led command Color CCWW where CCWW are hexadecimal values fro 00 - FF
* Reduce Sonoff Led flickering by disabling interrupts during flash save and disabling
* Led during OTA upgrade and Web upload (#16)
*
* 3.9.17 20170217
* Fix possible ArduinoJSON related memory fragmentation
* Changed console logging using less memory
* Add GPIO04 as user selectable for Sonoff Dual (#75)
*
* 3.9.16 20170214
* Update latching relay handler
* Add support for IR led using IRremoteESP8266 library (#59)
* Add Hue argument passing using ArduinoJSON library (#59)
*
* 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
*
* 3.9.14 20170211
* Add False and True as alternatives for 0/Off and 1/On (#49)
* Fix Status10 JSON format (#52)
* Fix DS18x20 using OneWire library (#53)
*
* 3.9.13 20170210
* Add FlashChipMode to Status 4
* Removed redundant DHT2 option and code
* Add Sonoff SV GPIO pin 05 configuration (#40)
* Add configuration file backup and restore via web page
* Fix latency due to light_sleep mode even if sleep was set to zero (#50)
*
* 3.9.12 20170208
* Fix compile error when webserver is disabled (#30)
* Fix possible ESP8285 flash problem by updating Flash Chip Mode to DOUT during OTA upload
* Fix hostname issues by not allowing user entry of string formatting and removing from user_config.h (#36)
*
* 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)
*
* 3.9.10 20170130
* Add WS2812 Color Type selection (RGB or GRB) to user_config.h (#7)
* Hue api changes to support HUE App(s) (#8)
*
* 3.9.9 20170130
* Add command status 10 showing sensor data
* Fix hlw status messages if hlw is disabled
*
* 3.9.8 20170130
* Remove GPIO07 and GPIO08 from user selectable (#5)
*
* 3.9.7 20170129
* Fix possible WS2812 exceptions when using emulation
* Add command Emulation to dynamic configure Belkin WeMo and Hue Bridge for Alexa
*
* 3.9.6 20170129
* Add dynamic sleep for WS2812 animation (#1)
*
* 3.9.5 20170128
* Fix error message in case of wrong Domoticz command
*
* 3.9.4 20170127
* Fix Sonoff Dual Relay switching (#287)
*
* 3.9.3 20170127
* Add confirmation before Restart via webpage
* Expand Domoticz Configuration webpage with Key, Switch and Sensor Index and
* add commands DomoticzSwitchIdx and DomoticzSensorIdx (#86) (#174) (#219)
* Fix default DHT11 sensor driver selection
* Fix LedPower status after button press (#279)
* Add command Sleep 0 - 250 mSec for optional light sleep mode to lower energy consumption (#272)
* (Expect overall button/key/switch misses and wrong values on Sonoff Pow)
* Add Hue brightness extension (#281)
* Fix Hue brightness and change to call by reference (#283)
*
* 3.9.2 20170124
* Add confirmation before Reset Configuration via webpage (#244)
* Add WS2812 features (see Wiki commands)
*
* 3.9.1 20170124
* Change PowerOnState function to only trigger when Power On (and not just restart) (#238)
* Move HLW interrupts back to RAM and make WS2812_DMA optional as it generates Exception on Pow (#264)
* Add charset=utf-8 to webpages (#266)
* Update Hue emulation (#268)
* Fix status module number
* Add support for domoticz Dimmer on Sonoff_Led and WS2812
* Fix possible ESP8285 flash problem by updating Flash Chip Mode to DOUT during web upload
*
* 3.2.6a 20170120
* Fix Sonoff Pow compile error (#255)
* Move HLW interrupts back to ROM (Needed for WS2812 DMA interrupts)
* Removed all IO config from user_config.h as this will be done by commands or webpage
* Removed MessageFormat and supports JSON only except POWER/LIGHT status
* Add command LedPower to control main led (#247)
* Add more FriendlyNames for Hue (#254)
* Add DMA support for WS2812 when using pin 3 while other pins work just as well in my case...
* Add HUE emulation for Alexa (#229)
* Add basic WS2812 support (#229)
* Fix Wemo when MQTT is disabled (#245)
* Revert ButtonTopic and change SwitchTopic1 - 4 to one SwitchTopic
* Rename MqttUnits to Units
* Add Mqtt command to enable/disable MQTT
*
* 3.2.2a 20170115
* Add dynamic (Sonoff) Module, user GPIO and sensor selection (one size fits (almost) all)
* Add support for Sonoff LED
* Add Seriallog disable after 600 seconds for Sonoff Dual and 4 Channel
* Add ButtonTopic2 - 4, SwitchTopic1 - 4 and SwitchRetain
*
* 3.2.2 20170113
* Fix PowerOnState 2 functionality after re-applying power (#230)
*
* 3.2.1 20170113
* Fix some failed command decoding (#228)
* Removed passwords from status messages (#216)
*
* 3.2.0 20170111
* Add I2C BH1750 sensor (#222)
* Sensor rewrite preparing for online selection
*
* 3.1.16 20170109
* Fix Domoticz possible error condition
* Remove Wifi password from connection message (#216)
* Add Configure Other menu item to web page (#209)
* Add command FriendlyName, field Friendly Name and define FRIENDLY_NAME to be used by Alexa
* eliminating current use of MQTT_CLIENT_ID (#209)
* Add friendlyname to webpage replacing former hostname
*
* 3.1.15 20170108
* Fix Domoticz send key regression with Toggle command
*
* 3.1.14 20170107
* Add support for command TOGGLE (define MQTT_CMND_TOGGLE) when ButtonTopic is in use and not equal to Topic (#207)
*
* 3.1.13 20170107
* Fix web console command input when SUB_PREFIX contains '/' (#152)
* Add command response to web command (#200)
* Add option to disable MQTT as define USE_MQTT in user_config.h (#200)
*
* 3.1.12 20170106
* Add OTA retry to solve possible HTTP transient errors (#204)
* Fix MQTT host discovery
*
* 3.1.11 20170105
* Add mDNS to advertise webserver as <hostname>.local/
*
* 3.1.10 20170105
* Fix ButtonTopic when SUB_PREFIX = PUB_PREFIX
* Add workaround for possible MQTT queueing when SUB_PREFIX = PUB_PREFIX
* Add optional MQTT host discovery using define USE_DISCOVERY in user_config.h (#115)
*
* 3.1.9 20170104
* Fix Power Blink start position (toggled)
* Change PulseTime increments: 1 .. 111 in 0.1 sec (max 11 seconds) and 112 .. 64900 in seconds (= 12 seconds until 18 hours) (#188)
* Add support for SUB_PREFIX = PUB_PREFIX (#190)
*
* 3.1.8 20170103
* Add retain flag to LWT offline and only send "tele/sonoff/LWT Offline" (#179)
* Change retained LWT Online message to only send "tele/sonoff/LWT Online"
*
* 3.1.7 20161231
* Add retained message LWT Online when sonoff makes MQTT connection (#179)
*
* 3.1.6 20161230
* Add blinking using commands BlinkTime, BlinkCount and Power Blink|3|BlinkOff|4 (#165)
*
* 3.1.5 20161228
* Fix serial space command exception (28)
*
* 3.1.4 20161227
* Fix MQTT subscribe regression exception (3) (#162)
* Fix serial empty command exception (28)
*
* 3.1.3 20161225
* Extent Domoticz configuration webpage with optional indices (#153)
* Fix multi relay legacy tele message from tele/sonoff/2/POWER to tele/sonoff/POWER2
* Add support for iTead Motor Clockwise/Anticlockwise
*
* 3.1.2 20161224
* Extent command PowerOnState with toggle at power on (option 2 is now option 3!) (#156)
*
* 3.1.1 20161223
* Add support for Sonoff Touch and Sonoff 4CH (#40)
* Update DomoticzIdx and DomoticzKeyIdx with relay/key index (DomoticzIdx1/DomoticzKeyIdx1)
* Add command PowerOnState to control relay(s) at power on (#154)
*
* 3.1.0 20161221
* Add Sonoff Pow measurement smoothing
* Fix serial command topic preamble error (#151)
* Fix 2.x to 3.x migration inconsistencies (#146)
*
* 3.0.9 20161218
* Add Sonoff Pow voltage reading when relay is on but no load present (#123)
*
* 3.0.8 20161218
* Add temperature conversion to Fahrenheit as option in user_config.h (TEMP_CONVERSION) (#145)
*
* 3.0.7 20161217
* Add user_config_override.h to be used by user to override some defaults in user_config.h (#58)
* Fix Sonoff Pow low power (down to 4W) intermittent measurements (#123)
*
* 3.0.6 20161217
* Fix MQTT_CLIENT_ID starting with % sign as in "%06X" (#142)
* Add auto power off after PulseTime * 0.1 Sec to relay 1 (#134)
*
* 3.0.5 20161215
* Add more control over LED with command LedState options (#136, #143)
* LED_OFF (0), LED_POWER (1), LED_MQTTSUB (2), LED_POWER_MQTTSUB (3), LED_MQTTPUB (4), LED_POWER_MQTTPUB (5), LED_MQTT (6), LED_POWER_MQTT (7)
* Add option WIFI_RETRY (4) to command WifiConfig to allow connection retry to other AP without restart (#73)
*
* 3.0.4 20161211
* Fix intermittent Domoticz update misses (#133)
*
* 3.0.3 20161210
* Fix compiler warnings (#132)
* Remove redundant code
* Fix Domoticz pushbutton support
*
* 3.0.2 20161209
* Add pushbutton to SwitchMode (#130)
*
* 3.0.1 20161209
* Fix initial config
*
* 3.0.0 20161208
* Migrate and clean-up flash layout
* Settings from version 2.x are saved but settings from version 3.x can not be used with version 2.x
* Change SEND_TELEMETRY_RSSI to SEND_TELEMETRY_WIFI and add AP and SSID to telemetry
* Split long JSON messages
* Fix inconsistent status messages
* Fix all status messages to return JSON if enabled
* Remove relay index in cmnd/sonoff/<relay>/POWER now changed
* to cmnd/sonoff/POWER for single relay units
* and cmnd/sonoff/POWER<relay> for multi relay units like Sonoff dual
* Add retain option to Power/Light status controlled by command PowerRetain On|Off (#126)
*
* 2.1.2 20161204
* Add support for second wifi AP (#73)
* Update command WifiConfig
* Fix possible WifiManager hang
*
* 2.1.1a 20161203
* Fix scan for wifi networks if WeMo is enabled
* Fix syslog setting using web page
*
* 2.1.1 20161202
* Add support for ElectroDragon second relay and button (only toggle with optional ButtonTopic) (#110)
*
* 2.1.0 20161202
* Add optional EXPERIMENTAL TLS to MQTT (#49)
* Fix MQTT payload handling (#111)
* Optimzed WeMo code
*
* 2.0.21a 20161201
* Fix WeMo PowerPlug emulation
*
* 2.0.21 20161130
* Add Belkin WeMo PowerPlug emulation enabled with USE_WEMO_EMULATION in user_config.h (Heiko Krupp) (#105, #109)
*
* 2.0.20 20161130
* Relax MQTTClient naming but only allows hexadecimal uppercase numbers (#107)
* Add I2C support with command I2CScan
* Add I2C sensor driver for HTU21 as alternate sensor using TH10/16 connectors (Heiko Krupp) (#105)
* Add I2C sensor driver for BMP085/BMP180/BMP280/BME280 as alternate sensor using TH10/16 connectors
*
* 2.0.19a 20161127
* Add support for ButtonTopic and ButtonRetain to wall switch function
* Add pullup to SWITCH_PIN and command SwitchMode to syntax
*
* 2.0.18 20161126
* Add SUB_PREFIX multi level support allowing 'cmnd' or 'cmnd/level2/level3'
* Add wall switch function to GPIO14 and command SwitchMode (Alex Scott) (#103)
*
* 2.0.17 20161123
* Calibrate HLWPCAL from 12345 to 12530
* Add alternative sensor driver DHT2 using Adafruit DHT library
* Add define MESSAGE_FORMAT to user_config.h
* Throttle console messages
* Shorten JSON messages
* Fix possible Panic
* Fix User mode webserver security
*
* 2.0.16 20161118
* Add alternative sensor driver DS18x20 using OneWire library (#95)
* Change sensor MQTT message from tele/sonoff/TEMPERATURE to tele/sonoff/DHT/TEMPERATURE or
* tele/sonoff/DS18B20/TEMPERATURE or tele/sonoff/DS18x20/1/TEMPERATURE
* Add sensors to root webpage and auto refresh every 4 seconds (#92)
* Add optional JSON messageformat to all telemetry data
* Enforce minimum TelePeriod to be 10 seconds
* Fix Energy Yesterday reset after restart
* Add Energy Today restore after controlled restart
*
* 2.0.15 20161116
* Change TODAY_POWER and PERIOD_POWER to TODAY_ENERGY and PERIOD_ENERGY
* Fix serial regression
* Fix syslog hangs when loghost is unavailable
*
* 2.0.14 20161115
* Add HLW threshold delay
* Fix HLW intermittent current deviation
* Fix button functionality during wificonfig
* Add CRC check to DS18B20 sensor (#88)
*
* 2.0.13 20161113
* Add additional upload error code descriptions
* Add PlatformIO support (#80)
*
* 2.0.12 20161113
* Fix Serial and Web response regression when no MQTT connection available
* Fix Sonoff Dual power telemetric data for second relay
* Removed MQTT password from Information web page
* Hide MQTT password from Configure MQTT web page
*
* 2.0.11 20161111
* Rewrite button and web toggle code
* Fix NTP sync
* Add HLW calibration commands HLWPCAL, HLWUCAL and HLWICAL (need define USE_POWERCALIBRATION)
* Fix power threshold tests
*
* 2.0.10 20161109
* Add additional Domoticz define (#63)
* Add defines MQTT_STATUS_ON and MQTT_STATUS_OFF in user_config.h to select status On/Off string
* Fix status response differences (#65)
* Fix divide by zero exception (#70)
* Fix syslog loop exception
*
* 2.0.9 20161108
* clarify MODULE in user_config.h
* Fix hlw false values
*
* 2.0.8 20161108
* Add initial status after power on
* Seperate driver files
* Fix hlw code and calibrate Pow
* Move user config defines to user_config.h (#61)
*
* 2.0.7 20161030
* Make Ticker mandatory
* Add Domoticz support (Increase MQTT_MAX_PACKET_SIZE to 400) (#54)
* Add command MessageFormat 0|1 to select either legacy or JSON output
*
* 2.0.6 20161024
* Add Sonoff Pow power factor
* Initial support for up to four relays using iTEAD PSB (4Channel)
* - Currently only supports one button (All buttons behave the same)
* - Use command MODEL 4 to select four relay option
* (After first power on it will support 2 relays like Sonoff Dual)
* Fix ledstate
* Add command Status 9 to display Sonoff Pow thresholds
* Add commands PowerLow, PowerHigh, VoltageLow, VoltageHigh, CurrentLow and CurrentHigh for use
* with Sonoff Pow thresholds
*
* 2.0.5 20161018
* Add updates to user_config.h - moved SEND_TELEMETRY_DS18B20 and SEND_TELEMETRY_DHT to module area.
* As Sonoff TH10/16 does not have the logic installed for GPIO04 You'll have to select ONE of both
* Add Sonoff Pow support (experimental until Pow tested)
* Add command Status 8 to display Sonoff Pow energy values
* Add command MqttUnits On|Off to add units to values
* Change web main page header character size
* Change On/Off to ON/OFF status messages to satisfy openHAB
* Change TEMP to TEMPERATURE and HUM to HUMIDITY
*
* 2.0.4 20161009
* Add MQTT_BUTTON_RETAIN, SAVE_DATA and SAVE_STATE defines to user_config.h (#35)
* Update ButtonRetain to remove retained message(s) from broker when turned off
* Add Retain for second relay on Sonoff Dual
* Provide power status messages with device topic index if requested
*
* 2.0.3 20161008
* Update wifi initialization
* Add command BUTTONRETAIN for optional MQTT retain on button press (#35)
* Add command SAVESTATE to disable power state save. May be used with MQTT retain
*
* 2.0.2 20161006
* Fix wifi issue 2186
*
* 2.0.1 20161002
* Fix button press
*
* 2.0.0 20161002
* Update Sonoff TH10/16 sensor pins (My TH10 only has GPIO14 connected)
* Add full support for Sonoff dual
*
* 1.0.35 20160929
* Add more lines to console
* Add timeout and disable MQTT on web upload
* Add command SAVEDATA to control parameter save (for flash wear afficionados) (#30)
*
* 1.0.34 20160926
* Fix button press six and seven
* Add more information to webserver
*
* 1.0.33 20160915
* Better WPS error message
* Separate webserver code from support.ino into webserver.ino
* Fix webserver User by removing unwanted restart option
*
* 1.0.32 20160913
* Add Wifi Protected Setup (WPS) as third option for initial config
* Add command WIFICONFIG replacing deprecated command SMARTCONFIG
* Add option WIFICONFIG 3 to start WPSconfig
* Add option WIFICONFIG 0 to start saved Wifi config tool (WPSconfig, Smartconfig or Wifimanager)
* Change button behaviour - See Wiki
*
* 1.0.31 20160907
* Fix DS18B20 misread if teleperiod = 2
* Tuned sensor code
* Updated prefered ElectroDragon connection to Relay 1 and Button 1
* Moved SONOFF and ELECTRO_DRAGON port config to user_config.h
*
* 1.0.30 20160902
* Fix command TELEPERIOD 0
* Add ESP- tag to UDP log message for easy rsyslogd filtering
* Add ElectroDragon (Relay 2 only) functionality. Select with #define MODULE ELECTRO_DRAGON
* Add ? as null message alternative
* Add DHT temperature and humidity telemetry support. Enable with #define SEND_TELEMETRY_DHT
* Add DS18B20 temperature telemetry support. Enable with #define SEND_TELEMETRY_DS18B20
* Restrict HOSTNAME, MQTTCLIENT, TOPIC and BUTTONTOPIC in topic mode only
*
* 1.0.29 20160831
* Allow UPGRADE, OTAURL, RESTART, RESET, MQTTHOST, MQTTPORT, MQTTUSER, MQTTPASSWORD and WEBSERVER also in group mode
*
* 1.0.28 20160831
* Add webserver state to status 5
* Add optional PUB_PREFIX2 (tele) for telemetry usage
* Add command TELEPERIOD
* Fix syntax message
* Change memory status display
*
* 1.0.27 20160831
* Add sketch flash size
* Add console to webserver
* Add command weblog
* Change WifiManager web pages to minimal
* Change display default hostname and MQTT client id in webserver
* Change HTTP command interface to http://sonoff-1234/cm?cmnd=light 2
* Change HEARTBEAT to UPTIME
*
* 1.0.26 20160829
* Add define USE_WEBSERVER to disable web server code in source
* Add file upload as alternative for ota upload to webserver
* Add information to webserver
* Add command hostname
* Add command logport
* Change HTTP command interface to http://sonoff-1234/cmd?cmnd=light 2
* Change button behaviour with regards to Smartconfig and OTA upload. See README.md
* Enforce default hostname to either "%s-%04d" or user defined without any %
* Enforce default mqtt client id to either "DVES_%06X" or user defined without any %
*
* 1.0.25 20160822
* Remove config system halts to keep ota available
*
* 1.0.24 20160821
* Add test for MQTT_SUBTOPIC
* Change log range to LOG_LEVEL_ALL
* Change MQTT introduction messages
* Moved MQTT_MAX_PACKET_SIZE warning message to introduction messages
*
* 1.0.23 20160821
* Add option USE_SPIFFS to move config from flash to spiffs
* Add webserver with options 0 (off), 1 (user) and 2 (admin)
* Add HTTP command interface (http://sonoff-1234/c?cmnd=light 2)
* Add wifimanager countdown counter
* Add command line webpage
* Add relay control to wifimanager
* Add restart option 99 to force restart
* Fix wifi hostname
* Fix NETBIOS hostname problem by reducing default hostname length
* Fix possible exception if WIFI_HOSTNAME is changed
* Fix upgrade messages
* Reduce memory use by redesigning config routines
* Split syntax message
* Rename define SERIAL_IO to USE_SERIAL
*
* 1.0.22 20160814
* Add all MQTT parameters for configuration
* Add wifimanager to configure Wifi and MQTT via web server
* Change NTP time handling
* Fix Smartconfig parameter buffer overflow
* Fix PlatformIO warnings
*
* 1.0.21 20160808
* Remove semaphore as subscription flooding (more than 15 subscriptions per second) is managed by SDK (LmacRxBlk:1)
* Add optional RTC interrupt (define USE_TICKER) to keep RTC synced during subscription flooding
* Remove heartbeatflag
*
* 1.0.20 20160805
* Add semaphore to handle out of memory when too many subscriptions requested
* Use Daylight Saving (DST) parameters from user_config.h when timezone = 99
* Add status 7 option displaying RTC information
* Add ledstate to status 0
*
* 1.0.19 20160803
* Fix possible MQTT_CLIENT_ID induced Exception(28)
*
* 1.0.18 20160803
* Moved Cfg_Default
* Fix negative data handling
* Remove MQTT information from status 1 and add labels to status 1
* Add mac address to status 5
* Add MQTT ClientId, UserId and Password to status 6
*
* 1.0.17 20160731
* Better variable range checking
* Change ambiguous connection messages
* Add timestamp to serial message
*
* 1.0.16 20160729
* Moved wifi, rtc, syslog and config to support.ino
* Fixed button action when buttontopic is used. Introduced with 1.0.15
* Better buffer overflow checks (strlcpy)
*
* 1.0.15 20160728
* Removed pubsubclient config changes from sonoff.ino as it doesn't work
* reapply MQTT_MAX_PACKET_SIZE 256 and MQTT_KEEPALIVE 120 to PubSubClient.h
* Add status 0 option displaying all status messages
* Change MQTT_MAX_PACKET_SIZE from 1024 to 256
* Add buffer overflow checks (snprintf and strncpy)
* Implemented common string sizes
*
* 1.0.14 20160722
* Seperate user config from sonoff.ino to user_config.h (pucebaboon)
* Change defaults from sidnas2 to domus1
* Add MQTT status message as status 6 (pucebaboon)
* Add status type to message (pucebaboon)
* Add pubsubclient config changes to sonoff.ino (pucebaboon)
*
* 1.0.13 20160702
* Add Ledstate 1 option to show power state on led
*
* 1.0.12 20160529
* Allow disable of button topic using "0"
*
* 1.0.11 20160524
* Provide button response if MQTT connection lost
*
* 1.0.10 20160520
* Add optional button topic to assist external MQTT clients
* Change version notation
* Reset default values
*
* 1.0.9 20160503
* Add more blinks
* Add reset 2 option erasing flash
* Add status 5 option displaying network info
* Add syslog check for Wifi connection
* Resize mqtt_publish log array
* Change Wifi smartconfig active from 100 to 60 seconds
* Update Wifi initialization
*
* 1.0.8 20160430
* Remove use of Wifi config data from SDK
* Add status 3 (syslog info) and status 4 (flash info)
* Add restart option to button (5 quick presses)
*
* 1.0.7 20160420
* Add UDP syslog support
* Change HOST command to MQTTHOST command
* Add commands SYSLOG, SERIALLOG and LOGHOST
* Change hostname to lower case to distinguise between open-sdk version
* Add support for ESP-12F used in my modified wkaku power socket switch
* Fix timezone command
* Add RTC month names for future use
* Modify button code
* Remove initialization errors by better use of MQTT loop
*
* 1.0.6 20160406
* Removed Wifi AP mode (#1)
* Add test for Arduino IDE version >= 1.6.8
* Fix RTC time sync code
*
* 1.0.5 20160310
* Initial public release
* Show debug info by selecting option from IDE Tools Debug port: Serial
*/