feat(accent): light IKEA TRADFRI colour bulbs in the accent

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>

1 files changed, 3 insertions, 3 deletions

diff --git a/bin/udt-accent b/bin/udt-accent
index 2f9440d..70557d8 100755
--- a/bin/udt-accent
+++ b/bin/udt-accent
@@ -625,9 +625,9 @@ def main(image):
     # GRUB's background is a wallpaper snapshot. Detached for the same reason;
     # it only rebuilds and notifies, since the copy into /boot needs root.
     # The keyboard takes seconds per colour change, and is often not there.
-    # The LED strip waits up to 20 s for its address broadcast. Both read
-    # files written above.
-    for helper in ("udt-homepage", "udt-grub", "udt-keyboard", "udt-ledstrip"):
+    # The LED strip waits up to 20 s for its address broadcast, the bulbs
+    # up to 5 s per bulb for the gateway. All three read files written above.
+    for helper in ("udt-homepage", "udt-grub", "udt-keyboard", "udt-ledstrip", "udt-bulb"):
         subprocess.Popen([Path(__file__).resolve().parent / helper],
                          stdin=subprocess.DEVNULL, stdout=subprocess.DEVNULL,
                          stderr=subprocess.DEVNULL, start_new_session=True)