LED REST service

A simple service in C for controlling an RGB LED strip connected to a BitWizard Motor board over SPI or an P9813 IC, made for running on a Raspberry Pi

Supports both REST and MQTT interfaces for status and modification.

HTTP endpoints;

• GET /light/state
• POST /light/state - Using either query or form-encoded state=0|off|1|on
• DELETE /light/state
• GET /light/rgb
• POST /light/rgb - Using either query or form-encoded r=0..255 g=0..255 b=0..255
• DELETE /light/rgb
• GET /light/hsv
• POST /light/hsv - Using either query or form-encoded h=0..360 s=0..1 v=0..1
• DELETE /light/hsv
• GET /light/temperature (for blackbody radiation, in Kelvin)
• POST /light/temperature - Using either query or form-encoded k=1000..40000 v=0..1
• DELETE /light/temperature

Published MQTT topics; (Using the default prefix of light)

• light/state - on|off
• light/temperature - blackbody radiation in Kelvin (1000..40000)
• light/rgb - comma-separated RGB color (0..255)
• light/color - comma-separated hue (0..360) and saturation (0..100)
• light/brightness - brightness (0..100)

Subscribed MQTT topics; (Using the default prefix of light)

• light/state/set - Accepts on|off
• light/temperature/set - Accepts Kelvin 1000..40000
• light/color/set - Accepts comma-separated hue and saturation in 0..360 and 0..100
• light/brightness/set - Accepts brightness in 0..100
• light/rgb/set - Accepts comma-separated RGB in 0..255 (Auto-scales to brightness)