diff --git a/src/app.rs b/src/app.rs
index 374fcb0..d84ef74 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -1,24 +1,20 @@
 use crate::websocket::{core::*, helper::read_sheet_config, model::*};
 use axum::{
     Router,
+    extract::DefaultBodyLimit,
     routing::{get, post},
     serve::ListenerExt,
 };
-use log::{error, info, warn};
+use log::{error, info};
 use redis::TypedCommands;
 use reqwest::{StatusCode, multipart};
 use std::{
     collections::{HashMap, VecDeque},
     env,
-    fs::{self, File},
-    io::BufReader,
-    sync::Arc,
+    sync::{Arc, RwLock},
     time::Duration,
 };
-use tokio::{
-    fs::read_dir,
-    sync::{Mutex, mpsc::Sender},
-};
+use tokio::sync::{Mutex, mpsc::Sender};
 
 #[derive(Clone)]
 pub struct Hub {
@@ -106,7 +102,7 @@ pub struct AppState {
     pub redis_cli: redis::Client,
     pub system_tx: tokio::sync::broadcast::Sender<serde_json::Value>,
     // saved client uid:client uuid
-    pub connectors_mapping: Arc<Mutex<Hub>>,
+    pub connectors_mapping: Arc<RwLock<Hub>>,
 }
 
 impl AppState {
@@ -126,7 +122,7 @@ impl AppState {
             dev_config: dev_config.clone(),
             redis_cli,
             system_tx,
-            connectors_mapping: Arc::new(Mutex::new(Hub {
+            connectors_mapping: Arc::new(RwLock::new(Hub {
                 clients: HashMap::new(),
             })),
         });
@@ -439,10 +435,12 @@ pub async fn initialize() -> Result<(), Box<dyn std::error::Error>> {
             "/syscb",
             post(crate::websocket::handler::post_from_other_system),
         )
+        .route("/users", get(crate::websocket::handler::get_online_users))
         .route("/load-config", post(crate::websocket::handler::post_config))
         // .route("/regas", post(request_api_session_key))
         .nest("/recipe", rp_router)
         // .nest("/docs", doc_router)
+        .layer(DefaultBodyLimit::max(100 * 1024 * 1024))
         .with_state(app_state);
 
     // feature: no delay, full throttle
diff --git a/src/websocket/core.rs b/src/websocket/core.rs
index ec8c8fa..b15f4c0 100644
--- a/src/websocket/core.rs
+++ b/src/websocket/core.rs
@@ -13,6 +13,9 @@ pub const TIMEOUT: Duration = Duration::from_secs(60 * 5);
 /// CONFIG: date format for using in recipe
 pub const LAST_CHANGE_DATE_FORMAT: &str = "%v %T";
 
+/// CONFIG: websocket size limit
+pub const WEBSOCKET_MAX_BYTES: usize = 2 * 1024 * 1024;
+
 #[derive(Clone)]
 pub enum TxControlMessage {
     Payload(serde_json::Value),
diff --git a/src/websocket/handler.rs b/src/websocket/handler.rs
index 2cd917b..4a4e0e9 100644
--- a/src/websocket/handler.rs
+++ b/src/websocket/handler.rs
@@ -1,13 +1,21 @@
 use axum::{
     Json,
+    body::Bytes,
     extract::{Request, State, WebSocketUpgrade, ws::WebSocket},
     response::IntoResponse,
 };
 use futures::StreamExt;
-use log::{info, warn};
+use log::{error, info, warn};
 use redis::TypedCommands;
-use std::{fs::File, io::BufWriter, sync::Arc};
-use tokio::{sync::Mutex, sync::mpsc, time::Instant};
+use std::{
+    fs::File,
+    io::BufWriter,
+    sync::{Arc, RwLock},
+};
+use tokio::{
+    sync::{Mutex, mpsc},
+    time::Instant,
+};
 use uuid::Uuid;
 
 use super::{core::*, model::*};
@@ -20,19 +28,97 @@ pub async fn post_from_other_system(
     State(state): State<Arc<AppState>>,
     Json(msg): Json<SysMessage>,
 ) -> impl IntoResponse {
-    let sys_payload = match serde_json::to_value(&msg) {
-        Ok(s) => s,
-        Err(_) => {
+    info!("triggering post callback");
+    let target_receiver = if let Some(to) = msg.payload.get("to") {
+        to.as_str().unwrap_or_default().to_string()
+    } else {
+        "".to_string()
+    };
+
+    let from_service = if let Some(from) = msg.payload.get("from") {
+        from.as_str().unwrap_or_default().to_string()
+    } else {
+        "".to_string()
+    };
+
+    info!("posting from {from_service} to {target_receiver}");
+
+    match target_receiver.as_str() {
+        "*" => {
+            // send all
+
+            info!("sending all receivers ...");
+            let clients = {
+                let lock = state.connectors_mapping.read().unwrap();
+                lock.clients.clone()
+            };
+
+            info!("acquired read lock");
+            let mut send_success_count = 0;
+            let mut send_fail_count = 0;
+            let mut fail_cause = String::new();
+            for (uid, tx) in clients.iter() {
+                if let Err(e) = tx
+                    .send(TxControlMessage::Payload(serde_json::json!(msg)))
+                    .await
+                {
+                    send_fail_count += 1;
+                    error!("send to {uid} fail: {e}");
+                    fail_cause.push_str(format!("{uid}:{e}\n").as_str());
+                } else {
+                    send_success_count += 1;
+                    info!("send to {uid} success!");
+                }
+            }
+
+            info!("[send-all] success: {send_success_count}, fail: {send_fail_count}");
+
             return (
-                axum::http::StatusCode::INTERNAL_SERVER_ERROR,
-                "cannot create payload",
+                axum::http::StatusCode::OK,
+                serde_json::json!({
+                  "success": send_success_count,
+                  "fail": send_fail_count,
+                  "cause": fail_cause
+                })
+                .to_string(),
+            )
+                .into_response();
+        }
+        recv if !target_receiver.is_empty() => {
+            let recv_sender = {
+                let lock = state.connectors_mapping.read().unwrap();
+                lock.clients.get(recv).cloned()
+            };
+            info!("[send-single] acquired client");
+
+            if let Some(recv_tx) = recv_sender {
+                info!("[send-single] acquired client ok, sending ...");
+                if let Err(e) = recv_tx
+                    .send(TxControlMessage::Payload(serde_json::json!(msg)))
+                    .await
+                {
+                    return (
+                        axum::http::StatusCode::INTERNAL_SERVER_ERROR,
+                        format!("send fail: {e}"),
+                    )
+                        .into_response();
+                } else {
+                    info!("[send-single] send success");
+                    return (axum::http::StatusCode::OK, "send success").into_response();
+                }
+            } else {
+                error!("target user is not connected, user may be offline or disconnected!");
+                return (axum::http::StatusCode::BAD_REQUEST, "user not found").into_response();
+            }
+        }
+        _ => {
+            warn!("payload is incorrect from {from_service}, sender was not provided receiver");
+            return (
+                axum::http::StatusCode::BAD_REQUEST,
+                "receiver is empty or wrong type",
             )
                 .into_response();
         }
-    };
-    match state.system_tx.send(sys_payload) {
-        Ok(_) => (axum::http::StatusCode::OK, "").into_response(),
-        Err(_) => (axum::http::StatusCode::INTERNAL_SERVER_ERROR, "send fail").into_response(),
     }
 }
 
@@ -91,6 +177,22 @@ pub async fn request_api_session_key(
     (axum::http::StatusCode::OK, generated).into_response()
 }
 
+pub async fn get_online_users(State(state): State<Arc<AppState>>) -> impl IntoResponse {
+    let on_connected_clients: Vec<String> = {
+        let lock = state.connectors_mapping.read().unwrap();
+        lock.clients.keys().map(|x| x.to_string()).collect()
+    };
+
+    (
+        axum::http::StatusCode::OK,
+        serde_json::json!({
+          "online": on_connected_clients
+        })
+        .to_string(),
+    )
+        .into_response()
+}
+
 /// Main websocket handler
 pub async fn websocket_handler(
     State(state): State<Arc<AppState>>,
@@ -115,27 +217,18 @@ pub async fn websocket_handler(
         return (axum::http::StatusCode::FORBIDDEN, "".to_string()).into_response();
     }
 
-    // let mut uid_n = String::new();
+    // TODO: Add more headers?
 
-    // if let Some(uid) = headers.get("x-auth-uid") {
-    //     let uid_from_web = uid.to_str().unwrap_or_default().to_string();
-
-    //     uid_n = uid_from_web;
-    //     info!("user connect {uid_n}");
-    // }
-
-    // if uid_n.is_empty() {
-    //     return (axum::http::StatusCode::BAD_REQUEST, "").into_response();
-    // }
-
-    ws.on_failed_upgrade(|error| println!("Error upgrading websocket: {}", error))
+    ws.max_frame_size(WEBSOCKET_MAX_BYTES)
+        .max_message_size(WEBSOCKET_MAX_BYTES)
+        .on_failed_upgrade(|error| println!("Error upgrading websocket: {}", error))
         .on_upgrade(async |s| handle_socket(s, state_clone, hub_clone).await.unwrap_or(()))
 }
 
 async fn handle_socket(
     socket: WebSocket,
     state: Arc<AppState>,
-    hub: Arc<Mutex<Hub>>,
+    hub: Arc<RwLock<Hub>>,
 ) -> Result<(), Box<dyn std::error::Error>> {
     let (sender, receiver) = socket.split();
     // internal channel
@@ -163,27 +256,32 @@ async fn handle_socket(
     info!("{} connected", temp_session);
 
     {
-        let mut h = hub.lock().await;
+        let mut h = hub.write().unwrap();
         h.clients.insert(temp_session.clone(), tx.clone());
     }
 
-    let user_sys_rx = state.system_tx.subscribe();
+    // NOTE: disable from cause system tx could directly send to client rx
+    // without sending to system rx.
+    // let user_sys_rx = state.system_tx.subscribe();
 
     let last_seen = Arc::new(Mutex::new(Instant::now()));
 
     let reader_last_seen = last_seen.clone();
     let watchdog_last_seen = last_seen.clone();
 
-    let sender = tokio::spawn(super::rw::write(sender, rx, user.clone(), hub.clone()));
+    let hub_for_write = hub.clone();
+    let hub_for_read = hub.clone();
+
+    let sender = tokio::spawn(super::rw::write(sender, rx, user.clone(), hub_for_write));
     let reader = tokio::spawn(super::rw::read(
         state,
         receiver,
         tx.clone(),
         reader_last_seen,
         user.clone(),
-        hub.clone(),
+        hub_for_read,
     ));
-    let callback_to_client = super::rw::recv_sys_msg_send_back_client(tx.clone(), user_sys_rx);
+    // let callback_to_client = super::rw::recv_sys_msg_send_back_client(tx.clone(), user_sys_rx);
 
     let watchdog = super::tasks::watchdog::get_watchdog_task(
         tx,
@@ -192,27 +290,40 @@ async fn handle_socket(
         hub.clone(),
     );
 
-    let (rf, sf, cbc, wds) = tokio::join!(reader, sender, callback_to_client, watchdog);
+    let (rf, sf, wds) = tokio::join!(reader, sender, watchdog);
 
     if let Ok(rf_js) = rf
         && let Ok(sf_js) = sf
     {
+        let user = user.clone().lock().await.to_string();
         info!(
             "read end ok: {}, write end ok: {} [{}]",
             rf_js.is_ok(),
             sf_js.is_ok(),
-            user.clone().lock().await.to_string()
+            user.clone()
         );
-        if !cbc.is_finished() {
-            info!("sys rx still running");
-            cbc.abort();
-
-            if cbc.await.unwrap_err().is_cancelled() {
-                info!("sys rx force stop ...");
-            }
-        }
         if !wds.is_finished() {
             info!("watchdog still existed");
+
+            wds.abort();
+
+            if wds.await.unwrap_err().is_cancelled() {
+                info!("watchdog force stop");
+            }
+        }
+
+        {
+            let mut lock = hub.write().unwrap();
+
+            if lock.clients.contains_key(&user) {
+                warn!("user still existed! {user}, removing key ...");
+                lock.clients.remove(&user);
+                // check again
+                warn!(
+                    "after remove user, exist: {}",
+                    lock.clients.contains_key(&user)
+                );
+            }
         }
     }
 
diff --git a/src/websocket/rw.rs b/src/websocket/rw.rs
index f368bfa..edd134b 100644
--- a/src/websocket/rw.rs
+++ b/src/websocket/rw.rs
@@ -4,7 +4,8 @@ use crate::{
     websocket::{plugins::call_plugin_if_existed, tasks},
 };
 use std::{
-    sync::{Arc, atomic::AtomicBool},
+    collections::HashMap,
+    sync::{Arc, RwLock},
     time::Duration,
 };
 
@@ -32,7 +33,7 @@ pub async fn read(
     tx: Sender<TxControlMessage>,
     last_seen: Arc<Mutex<Instant>>, // cmd_atom: crossbeam_queue::ArrayQueue<CommandRequestPayload>,
     uid: Arc<Mutex<String>>,
-    hub: Arc<Mutex<Hub>>,
+    hub: Arc<RwLock<Hub>>,
 ) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
     let redis = state.redis_cli.clone();
     let config = state.dev_config.clone();
@@ -127,9 +128,15 @@ pub async fn read(
                             .await;
                     }
                     "sheet" if req.payload.is_some() => {
-                        if tasks::sheet::handle_sheet_request(config.clone(), redis.clone(), req)
-                            .await
-                            .is_err()
+                        if tasks::sheet::handle_sheet_request(
+                            config.clone(),
+                            redis.clone(),
+                            tx.clone(),
+                            req,
+                            uid_clone.clone(),
+                        )
+                        .await
+                        .is_err()
                         {
                             continue;
                         }
@@ -199,7 +206,7 @@ pub async fn read(
 
                 // remove current uid
                 {
-                    let mut h = hub.try_lock().unwrap();
+                    let mut h = hub.write().unwrap();
                     let curr_user = uid.try_lock().unwrap().to_string();
 
                     if let Some(ent) = h.clients.remove_entry(&curr_user) {
@@ -228,7 +235,10 @@ pub async fn read(
         }
     }
 
-    info!("[read] canceling sys rx ...");
+    info!(
+        "[read][{}] canceling sys rx ...",
+        uid_clone.lock().await.to_string()
+    );
 
     Ok(())
 }
@@ -237,8 +247,11 @@ pub async fn write(
     mut sender: SplitSink<WebSocket, Message>,
     mut rx: Receiver<TxControlMessage>,
     uid: Arc<Mutex<String>>,
-    hub: Arc<Mutex<Hub>>,
+    hub: Arc<RwLock<Hub>>,
 ) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
+    // only allow each stream type for 1 request
+    let pending_stream_requests = Arc::new(RwLock::new(HashMap::new()));
+
     while let Some(res) = rx.recv().await {
         match res {
             TxControlMessage::Payload(res) => {
@@ -266,10 +279,50 @@ pub async fn write(
                     && let Some(recv_ident) = res_payload_val.get("to")
                     && let Some(recv_ident_str) = recv_ident.as_str()
                     && (current_uid.to_string().eq(recv_ident_str)
-                        || current_uid.to_string().eq("*"))
+                        || recv_ident_str.to_string().eq("*"))
                 {
                     let payload_size = res.to_string().len();
 
+                    if tasks::sheet::is_tx_stream_type(res.clone()) {
+                        let rid = res_payload_val
+                            .get("request_id")
+                            .unwrap_or_default()
+                            .as_str();
+                        let rtype = res_n
+                            .get("type")
+                            .unwrap_or_default()
+                            .as_str()
+                            .unwrap_or_default();
+
+                        let mut pending = {
+                            let lock = pending_stream_requests.write().unwrap();
+                            lock
+                        };
+
+                        info!(
+                            "register stream type: {rtype}, with request id: {} and allow add to pending: {}",
+                            rid.unwrap().to_string(),
+                            !pending.contains_key(rtype)
+                        );
+
+                        if !rtype.is_empty() && !pending.contains_key(rtype) {
+                            // allow set pending
+                            pending.insert(rtype.to_string(), rid.unwrap().to_string());
+                            info!(
+                                "add pending stream: {} ---> {}",
+                                rtype,
+                                rid.unwrap().to_string()
+                            );
+                        } else if rtype.is_empty() {
+                            warn!("request stream type is empty!");
+                        } else {
+                            // blocking
+                            warn!("request more than once, please wait until current finish!");
+                        }
+
+                        continue;
+                    }
+
                     if payload_size >= 100000 {
                         // large payload
                         warn!(
@@ -278,16 +331,101 @@ pub async fn write(
                         );
                     }
 
-                    let _ = sender.send(res.to_string().into()).await;
+                    // handle check if response has been set as pending before
+
+                    let stream_ref = res_payload_val.get("ref").unwrap_or_default();
+
+                    let pending_has_key = {
+                        let lock = pending_stream_requests.read().unwrap();
+                        lock.contains_key(
+                            format!("stream-{}", stream_ref.as_str().unwrap_or_default()).as_str(),
+                        )
+                    };
+
+                    let stream_chunk_id = {
+                        let lock = pending_stream_requests.read().unwrap();
+                        lock.get(
+                            format!("stream-{}", stream_ref.as_str().unwrap_or_default()).as_str(),
+                        )
+                        .cloned()
+                        .unwrap_or_default()
+                    };
+
+                    if pending_has_key {
+                        // has set, do iterate now
+
+                        // gen payload size
+                        let size_per_payload = 10000;
+
+                        let chars: Vec<char> = res.to_string().chars().collect();
+                        let split = &chars
+                            .chunks(size_per_payload)
+                            .map(|chunk| chunk.iter().collect::<String>())
+                            .collect::<Vec<_>>();
+
+                        let header = serde_json::json!({
+                          "type": format!("raw_stream_{}", stream_ref.as_str().unwrap_or_default()),
+                          "payload": {
+                            "to": recv_ident_str,
+                            "total_chunks": split.len(),
+                            "size_per_chunk": size_per_payload,
+                            "request_id": stream_chunk_id
+                          }
+                        });
+
+                        let footer = serde_json::json!({
+                          "type": format!("raw_stream_end_{}", stream_ref.as_str().unwrap_or_default()),
+                          "payload": {
+                            "to": recv_ident_str,
+                            "request_id": stream_chunk_id
+                          }
+                        });
+
+                        let _ = sender.send(header.to_string().into()).await?;
+
+                        for (idx, raw_payload) in split.iter().enumerate() {
+                            let raw_chunk_payload = serde_json::json!({
+                              "type": format!("raw_stream_chunk_{}", stream_ref.as_str().unwrap_or_default()),
+                                "payload": {
+                                  "to": recv_ident_str,
+                                  "raw": raw_payload.clone(),
+                                  "idx": idx,
+                                  "request_id": stream_chunk_id
+                                }
+                            });
+                            let _ = sender.feed(raw_chunk_payload.to_string().into()).await;
+                        }
+
+                        if let Err(e) = sender.flush().await {
+                            error!("flushing stream failed: {e}");
+                            continue;
+                        }
+
+                        {
+                            // end stream
+                            let mut lock = pending_stream_requests.write().unwrap();
+
+                            lock.remove(
+                                format!("stream-{}", stream_ref.as_str().unwrap_or_default())
+                                    .as_str(),
+                            );
+                        }
+
+                        let _ = sender.send(footer.to_string().into()).await;
+
+                        continue;
+                    } else {
+                        if let Err(e) = sender.send(res.to_string().into()).await {
+                            error!("[write] send payload fail; len={payload_size}, reason: {e}");
+                        }
+                    }
                 } else {
                     // show error by case
-                    let clients: Vec<String> = hub
-                        .lock()
-                        .await
-                        .clients
-                        .keys()
-                        .map(|x| x.to_string())
-                        .collect();
+                    let clients: Vec<String> = {
+                        let lock = hub.read().unwrap();
+
+                        lock.clients.keys().map(|x| x.to_string()).collect()
+                    };
 
                     // step errors
                     if let Some(res_n) = res.as_object()
@@ -301,7 +439,7 @@ pub async fn write(
                                 if clients.contains(&recv_ident_str.to_string())
                                     && current_uid.ne(&recv_ident_str.to_string())
                                 {
-                                    warn!("oops! receiving other receiver's messages. Ignore this");
+                                    // warn!("oops! receiving other receiver's messages. Ignore this");
                                 } else {
                                     error!("receiver not existed or already went offline");
                                 }
diff --git a/src/websocket/tasks/auth.rs b/src/websocket/tasks/auth.rs
index b98ba25..3e6da20 100644
--- a/src/websocket/tasks/auth.rs
+++ b/src/websocket/tasks/auth.rs
@@ -1,7 +1,8 @@
 use crate::app::*;
 use crate::websocket::{core::*, model::*};
 use log::{error, info, warn};
-use std::sync::Arc;
+use std::sync::{Arc, RwLock};
+
 use tokio::sync::{Mutex, mpsc::Sender};
 
 /// Handle request of command type from websocket (read)
@@ -9,7 +10,7 @@ pub async fn handle_auth_request(
     state: Arc<AppState>,
     tx: Sender<TxControlMessage>,
     req: WebsocketMessageRequest,
-    hub: Arc<Mutex<Hub>>,
+    hub: Arc<RwLock<Hub>>,
     curr_uid: Arc<Mutex<String>>,
 ) -> WebsocketMessageResult {
     // do command send to other services
@@ -28,7 +29,10 @@ pub async fn handle_auth_request(
 
     if !new_uid.is_empty() {
         let old_uid = curr_uid.try_lock().unwrap().to_string();
-        let mut h = hub.try_lock().unwrap();
+        let mut h = {
+            let lock = hub.write().unwrap();
+            lock
+        };
         if let Some(ent) = h.clients.remove_entry(&old_uid) {
             let curr_connection = ent.1;
 
@@ -36,7 +40,7 @@ pub async fn handle_auth_request(
 
             // case auth success but already have some tx left
             if let Some(old_tx) = h.clients.insert(new_uid.clone(), curr_connection) {
-                warn!("disconnecting old connection");
+                warn!("[auth][{}] disconnecting old connection", old_uid.clone());
                 let _ = old_tx.send(TxControlMessage::CloseExist);
             }
             info!("update re-new auth successful ---> {}", new_uid.clone());
diff --git a/src/websocket/tasks/sheet.rs b/src/websocket/tasks/sheet.rs
index f62b2a3..8d72277 100644
--- a/src/websocket/tasks/sheet.rs
+++ b/src/websocket/tasks/sheet.rs
@@ -1,15 +1,20 @@
+use std::sync::Arc;
+
 use crate::{
     app::DevConfig,
     websocket::{core::*, model::*},
 };
 use log::{error, info};
 use redis::TypedCommands;
+use tokio::sync::{Mutex, mpsc::Sender};
 
 /// Handle request of sheet type from websocket (read)
 pub async fn handle_sheet_request(
     config: DevConfig,
     redis: redis::Client,
+    tx: Sender<TxControlMessage>,
     req: WebsocketMessageRequest,
+    uid_clone: Arc<Mutex<String>>,
 ) -> WebsocketMessageResult {
     // CommandRequestPayload struct-like
 
@@ -26,17 +31,28 @@ pub async fn handle_sheet_request(
             }
         };
 
-    info!(
-        "get sheet request: {}, {:?}",
-        payload_sheet_request.srv_name, payload_sheet_request
-    );
+    // info!(
+    //     "get sheet request: {}, {:?}",
+    //     payload_sheet_request.srv_name, payload_sheet_request
+    // );
 
     let parameters = payload_sheet_request
         .values
         .get("param")
         .unwrap_or_default();
 
-    // TODO: will be changed to config from yaml file
+    let stream_mode = payload_sheet_request
+        .values
+        .get("stream")
+        .unwrap_or_default();
+
+    let request_id = payload_sheet_request
+        .values
+        .get("request_id")
+        .unwrap_or_default();
+
+    let uidd = uid_clone.clone().lock().await.to_string();
+
     let ch_target = if let Some(pm) = parameters.as_str()
         && config.check_sheet_endpoints(pm)
     {
@@ -58,5 +74,39 @@ pub async fn handle_sheet_request(
         error!("error on publish result cmd: {e:?}");
     }
 
+    if let Some(stream_flag) = stream_mode.as_bool()
+        && let Some(request_id) = request_id.as_str()
+        && stream_flag
+        && !request_id.is_empty()
+    {
+        let _ = tx
+            .send(TxControlMessage::Payload(serde_json::json!({
+              "type": format!("stream-{ch_target}"),
+              "payload": {
+                "request_id": request_id.to_string(),
+                "to": uidd
+              }
+            })))
+            .await;
+    }
+
     Ok(())
 }
+
+pub fn is_tx_stream_type(raw: serde_json::Value) -> bool {
+    // expect request id
+    // type must start with stream
+    let tx_type = raw.get("type").unwrap_or_default();
+    let payload = raw.get("payload").unwrap_or_default();
+
+    if let Some(tx_t) = tx_type.as_str()
+        && let Some(request_id) = payload.get("request_id")
+        && let Some(rid) = request_id.as_str()
+        && tx_t.starts_with("stream-")
+        && !rid.is_empty()
+    {
+        true
+    } else {
+        false
+    }
+}
diff --git a/src/websocket/tasks/watchdog.rs b/src/websocket/tasks/watchdog.rs
index ddc7108..a5ac6f3 100644
--- a/src/websocket/tasks/watchdog.rs
+++ b/src/websocket/tasks/watchdog.rs
@@ -1,6 +1,10 @@
 use crate::{app::Hub, websocket::core::*};
 use log::{info, warn};
-use std::{ops::Sub, sync::Arc, time::Duration};
+use std::{
+    ops::Sub,
+    sync::{Arc, RwLock},
+    time::Duration,
+};
 use tokio::{
     sync::{Mutex, mpsc::Sender},
     task::JoinHandle,
@@ -11,16 +15,21 @@ pub async fn get_watchdog_task(
     tx: Sender<TxControlMessage>,
     watchdog_last_seen: Arc<Mutex<Instant>>,
     user: Arc<Mutex<String>>,
-    hub: Arc<Mutex<Hub>>,
+    hub: Arc<RwLock<Hub>>,
 ) -> JoinHandle<()> {
     tokio::spawn(async move {
         let uc = user.clone().lock().await.to_string();
         info!("start watchdog for {uc}");
+
         loop {
             tokio::time::sleep(Duration::from_secs(2)).await;
 
+            let h = {
+                let lock = hub.read().unwrap();
+                lock.clone()
+            };
+
             {
-                let h = hub.lock().await;
                 let curr_user = user.lock().await.to_string();
 
                 // info!("{}: checking invalid ...", curr_user);