MQTT contract

Each controller keeps one persistent WebSocket and publishes <topic>/connected, json, flattened state/... and info/... , plus effects and palettes. The complete WLED segment array is additionally published as JSON to <topic>/state/seg.

Publish a WLED JSON state object to <topic>/cmd:

{ "on": true, "bri": 180 }

The bridge adds WLED's v: true flag and receives the resulting state from the existing socket.

All command publications must be non-retained. The bridge clears a successfully received command topic with an empty payload.