[REST]

# about
$ curl -X GET http://192.168.1.45/api/about -H 'API-Key: zebrazebra'
{"app_name":"AiLight","app_version":"0.5.0","build_date":"Sep  4 2017","build_time":"09:57:54","memory":1048576,"free_heap":30160,"cpu_frequency":80,"manufacturer":"Ai-Thinker","model":"RGBW Light","device_ip":"192.168.1.45","mac":"2C:3A:E8:0D:FD:63"}

# status
$ curl -X GET http://192.168.1.45/api/light -H 'API-Key: zebrazebra'
{"state":"ON","brightness":255,"white_value":0,"color_temp":0,"color":{"r":128,"g":0,"b":128},"gamma":true}

# PATCH gamma does not work
$ curl -X PATCH http://192.168.1.45/api/light -H 'API-Key: zebrazebra' -H 'Content-Type: application/json' -d '{"gamma":false}'
{"state":"ON","brightness":255,"white_value":0,"color_temp":0,"color":{"r":128,"g":0,"b":128},"gamma":true}

# PATCH other settings (white_value in this case) succeeds
$ curl -X PATCH http://192.168.1.45/api/light -H 'API-Key: zebrazebra' -H 'Content-Type: application/json' -d '{"white_value":1}'
{"state":"ON","brightness":255,"white_value":1,"color_temp":0,"color":{"r":128,"g":0,"b":128},"gamma":true}petefoo@mooby:~/alexa/mqtt/v2$ 

[MQTT]

# publish gamma set 
Deck-24-BB6799/set {"gamma":true}
# response remains false
Deck-24-BB6799 {"state":"ON","brightness":255,"white_value":0,"color_temp":0,"color":{"r":128,"g":0,"b":128},"gamma":false}

# publish other settings (white_value in this case)
Deck-24-BB6799/set {"white_value":1}
# response reflects change
Deck-24-BB6799 {"state":"ON","brightness":255,"white_value":1,"color_temp":0,"color":{"r":128,"g":0,"b":128},"gamma":false}