Release v2.2.0

docs/websocket.md

@@ -24,6 +24,13 @@ This is the server-to-dashboard snapshot stream for live player connection state
 
 Access: internal-only. The web backend subscribes with signed request headers; browsers should not connect directly.
 
+### `GET /ws/screens/{slug}/announcements`
+Player announcement channel.
+
+This is the server-to-player push channel used to wake the player when an announcement changes. The browser player reconnects automatically and refreshes its announcement state when it receives an `announcement-refresh` message.
+
+Access: the player page must include a valid `auth` query parameter signed with the shared secret.
+
 ## Player Control Channel
 
 ### Messages from player to server
@@ -113,6 +120,26 @@ Moves to the next slide.
 Updates the client name associated with the player session and onboarding record.
 The command payload should include `clientName` and may include `deviceId` when the caller is updating a specific onboarding binding.
 
+## Announcement Channel
+
+### Messages from server to player
+
+The server sends a lightweight refresh notification.
+
+#### `announcement-refresh`
+
+Example payload:
+
+```json
+{
+  "type": "announcement-refresh",
+  "slug": "demo",
+  "sentAt": "2026-08-01T12:00:00.000Z"
+}
+```
+
+When the player receives this message, it refetches the current announcement state over HTTP.
+
 ## Snapshot Channel
 
 ### Messages from server to client