The command will somehow not be forwarded to HTTP Binding to dim the lights.
My item:
Number Night_Light_Percent "Night Light" <light> (GF_Living, Lights) ["TargetTemperature"] { http=">[*:POST:http://192.168.0.10/led/%2$s]" }
The Log:
2017-03-04 23:11:14.970 [ItemCommandEvent ] - Item 'Night_Light_Percent' received command 8
2017-03-04 23:11:14.987 [ItemStateChangedEvent ] - Night_Light_Percent changed from 20 to 8
Alexa is doing the job, OH2 also and set the percent but the Light has still the same brightness.
My other item is working great from App, Homekit and Web:
Dimmer Night_Light "Night Light" <light> (GF_Living, Lights) ["Lighting"] { http=">[*:GET:http://192.168.0.10/led/%2$s]" }