New Features

Backend

• ( Set HSBColor command for use with new OpenHab 2.4 MQTT-Binding #375 ) Add oh_color field, which adds support for OpenHAB's colorRGB channel type
• ( Set HSBColor command for use with new OpenHab 2.4 MQTT-Binding #375 ) Add support for controlling colors via commands like {"color":"255,0,0"}
• ( MQTT state_topic update not affected by group ALL #318 ) Group 0 updates did not affect constituent group states. This has been fixed
• ( LWT status messages #357 ) Add support for MQTT client status messages -- Last Will and Testament (LWT), Birth, Disconnections.
• ( Add ability to configure hostname #179 ) Add ability to configure hostname (changing it requires a reboot)
• ( Expose setting to control power amplifier config for NRF24L01 #208 ) Expose setting to control power level for nRF24L01.
• ( Toggle fuction #404 ) Add toggle command, which toggles on/off state
• ( Feature request? Set ch/freq to set value by user. #263 ) Add setting to select which channels packets are sent on
• ( Feature request? Set ch/freq to set value by user. #263 ) Add setting to select which channel (singular) packets are listened for on
• ( Add support of static IP in WifiManager #56 ) Add support for static IP addresses in settings
• ( Improvements in group 0 behavior #426 ) Improve how state for group 0 is tracked
• ( Add support for :dec_device_id and :hex_device_id in command topic #431 ) Add support for :hex_device_id and :dec_device_id in command topic pattern. Unnecessary given that :device_id supports bot hexadecimal and decimal IDs, but created unnecessary confusion
• Add support for kelvin command. This field was previously read-only.
• Add DELETE route for group state. This will delete known state. If MQTT is enabled, any existing retained state message will be deleted.

Web UI

• ( No way to delete unused ID's from drop down list #146 ) Add ability to remove entered Device IDs from UI
• ( Auto-save entered device IDs #282 ) Auto-save Device IDs entered from UI
• ( Feature/buttons #416 ) Spruce up Backup/Restore and Update modals in the Web UI (thanks, @jmw6773!)

Bug Fixes

• ( Colour temp sends 153 at both ends of the remotes slider. (rgb_cct) #388 ) Fix parsing for color temperature for intercepted packets
• ( REST API and MQTT report CCT bulbs state OFF when in night_mode #460 ) Fix night_mode handling for RGBW and CCT bulb types
• Fix memory leaks when patching or posting new settings

Improvements

• Fix deluge of compiler warnings
• Add integration test suite. Read more under the Development section of the README.
• Upgrade upstream library versions (most significantly: to ArduinoJson v6)
• Fix Arduino SDK to 2.4.0
• Fix library versions to prevent upstream changes from breaking the build
• Add d1_mini_pro board to build. Will start publishing artifacts for it as of 1.9.0.
• Use upstream libraries for REST HTTP server, path variable parsing