新增: 小程序端跨端AI对话

crates/df-relay/Cargo.toml

@@ -15,7 +15,7 @@ tracing = { workspace = true }
 # binary 入口(main.rs)日志初始化
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 
-# HTTP + WS 服务端
+# HTTP + WS 服务端(axum ws 内部用 tungstenite 协议层;df-relay 不直接依赖 tokio-tungstenite。
+# TLS 由 nginx wss 终止,:9180 明文 ws → 去 native-tls 避 openssl 依赖,利 linux 交叉/容器编译)
 axum = { version = "0.7", features = ["ws"] }
-tokio-tungstenite = { version = "0.23", features = ["native-tls"] }
 futures-util = "0.3"

crates/df-relay/src/relay.rs

@@ -247,6 +247,15 @@ async fn handle_connection(socket: WebSocket, state: RelayState, expected: Clien
         "连接握手通过,进入收发循环"
     );
 
+    // 握手通过:立即发 ack 控制帧给客户端。
+    // 客户端据此判定握手成功(首条非 error 消息即 handshaked),不依赖等待对端首条业务消息 ——
+    // 否则单端连入时(device 离线)relay 静默,客户端永卡 handshaking,send 被 handshaked 守卫拦截。
+    let _ = send_text(
+        &mut socket_tx,
+        r#"{"kind":"control","payload":{"control_kind":"hello_ack"}}"#,
+    )
+    .await;
+
     // 建立广播投递 mpsc(连接读取任务消费 → 写回 socket)
     let (bc_tx, bc_rx) = mpsc::unbounded_channel::<BroadcastMessage>();
     let handle = ConnHandle::new(conn_id, kind, device_id.clone(), bc_tx);