Adds support for Govee Wi-Fi smart bulbs and ambient-lighting kits via
their LAN API (opened in 2023). Discovery is multicast UDP on
239.255.255.250:4001; control commands go unicast to the device's port
4003; responses arrive on port 4002.
Each device requires "LAN Control" toggled ON in the Govee Home app
(Device -> settings -> LAN Control). Devices with LAN Control disabled
silently fail to appear in discovery and won't respond to commands; the
UI hint copy reminds users.
Backend:
- GoveeClient is a single-pixel UDP adapter: averages the strip to one
RGB triple and pushes a 'colorwc' command with colorTemInKelvin=0 to
select pure RGB mode (non-zero kelvin would switch the bulb to CCT
mode and ignore the RGB values).
- Brightness folds into the RGB scaling so we burn one packet per
frame instead of two.
- supports_fast_send=True with a synchronous send_pixels_fast hot path.
Default rate gate 50 ms (~20 Hz); UDP fire-and-forget tolerates it.
- Multicast discovery: scan request to 239.255.255.250:4001, listen on
port 4002, parse the inner data dict for IP + device-id + SKU +
firmware version. Degrades to [] when port 4002 is already bound or
network is unavailable.
- Health check sends devStatus and waits 1.5s for any reply; the error
message points at the LAN-Control toggle since that's the #1 root
cause of silent failures.
- GoveeConfig joins the typed config union; storage gains
govee_min_interval_ms; full to_dict/from_dict/to_config wiring.
- 40 unit tests cover URL parsing, scan-reply parsing (rejecting
non-scan commands and malformed JSON), payload builders (colorwc
with colorTemInKelvin=0, brightness clamping, power as 1/0 not
true/false), strip averaging, rate limiting, fast-send hot path,
provider validate/discover/health, Device.to_config round-trip.
Frontend:
- 'govee' in DEVICE_TYPE_KEYS (next to 'lifx'), lightbulb icon
(deliberate smart-bulb family grouping).
- isGoveeDevice predicate + per-type field show/hide.
- Rate-limit number input (default 50 ms).
- URL hint copy explicitly instructs users to enable LAN Control in
the Govee Home app -- the #1 source of "why isn't my Govee
responding?" support churn.
- Locale strings in en/ru/zh.
