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udt-bulb fades every paired colour bulb to the wallpaper accent through
the TRADFRI gateway's local CoAP API, over DTLS-PSK via libcoap's
coap-client. --pair trades the gateway's security code for an identity
of its own and records the colour bulbs in ~/.config/udt/tradfri.json.
Takes udt-ledstrip's on and off. A bare run, as udt-accent starts it,
skips bulbs that are off, since the gateway switches a bulb on for any
colour change. Colour and brightness go in separate requests, colour
first: combined, or with a colour sent during a brightness fade, the
gateway drops part of it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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