diff --git a/src/client.rs b/src/client.rs
index 665560d62..b687c8a84 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -3407,3 +3407,153 @@ async fn hc_connection_(
     }
     Ok(())
 }
+
+pub mod peer_online {
+    use hbb_common::{
+        anyhow::bail,
+        config::{Config, CONNECT_TIMEOUT, READ_TIMEOUT},
+        log,
+        rendezvous_proto::*,
+        sleep,
+        socket_client::connect_tcp,
+        tcp::FramedStream,
+        ResultType,
+    };
+    use std::time::Instant;
+
+    pub async fn query_online_states<F: FnOnce(Vec<String>, Vec<String>)>(ids: Vec<String>, f: F) {
+        let test = false;
+        if test {
+            sleep(1.5).await;
+            let mut onlines = ids;
+            let offlines = onlines.drain((onlines.len() / 2)..).collect();
+            f(onlines, offlines)
+        } else {
+            let query_begin = Instant::now();
+            let query_timeout = std::time::Duration::from_millis(3_000);
+            loop {
+                match query_online_states_(&ids, query_timeout).await {
+                    Ok((onlines, offlines)) => {
+                        f(onlines, offlines);
+                        break;
+                    }
+                    Err(e) => {
+                        log::debug!("{}", &e);
+                    }
+                }
+
+                if query_begin.elapsed() > query_timeout {
+                    log::debug!(
+                        "query onlines timeout {:?} ({:?})",
+                        query_begin.elapsed(),
+                        query_timeout
+                    );
+                    break;
+                }
+
+                sleep(1.5).await;
+            }
+        }
+    }
+
+    async fn create_online_stream() -> ResultType<FramedStream> {
+        let (rendezvous_server, _servers, _contained) =
+            crate::get_rendezvous_server(READ_TIMEOUT).await;
+        let tmp: Vec<&str> = rendezvous_server.split(":").collect();
+        if tmp.len() != 2 {
+            bail!("Invalid server address: {}", rendezvous_server);
+        }
+        let port: u16 = tmp[1].parse()?;
+        if port == 0 {
+            bail!("Invalid server address: {}", rendezvous_server);
+        }
+        let online_server = format!("{}:{}", tmp[0], port - 1);
+        connect_tcp(online_server, CONNECT_TIMEOUT).await
+    }
+
+    async fn query_online_states_(
+        ids: &Vec<String>,
+        timeout: std::time::Duration,
+    ) -> ResultType<(Vec<String>, Vec<String>)> {
+        let query_begin = Instant::now();
+
+        let mut msg_out = RendezvousMessage::new();
+        msg_out.set_online_request(OnlineRequest {
+            id: Config::get_id(),
+            peers: ids.clone(),
+            ..Default::default()
+        });
+
+        loop {
+            let mut socket = match create_online_stream().await {
+                Ok(s) => s,
+                Err(e) => {
+                    log::debug!("Failed to create peers online stream, {e}");
+                    return Ok((vec![], ids.clone()));
+                }
+            };
+            // TODO: Use long connections to avoid socket creation
+            // If we use a Arc<Mutex<Option<FramedStream>>> to hold and reuse the previous socket,
+            // we may face the following error:
+            // An established connection was aborted by the software in your host machine. (os error 10053)
+            if let Err(e) = socket.send(&msg_out).await {
+                log::debug!("Failed to send peers online states query, {e}");
+                return Ok((vec![], ids.clone()));
+            }
+            if let Some(msg_in) =
+                crate::common::get_next_nonkeyexchange_msg(&mut socket, None).await
+            {
+                match msg_in.union {
+                    Some(rendezvous_message::Union::OnlineResponse(online_response)) => {
+                        let states = online_response.states;
+                        let mut onlines = Vec::new();
+                        let mut offlines = Vec::new();
+                        for i in 0..ids.len() {
+                            // bytes index from left to right
+                            let bit_value = 0x01 << (7 - i % 8);
+                            if (states[i / 8] & bit_value) == bit_value {
+                                onlines.push(ids[i].clone());
+                            } else {
+                                offlines.push(ids[i].clone());
+                            }
+                        }
+                        return Ok((onlines, offlines));
+                    }
+                    _ => {
+                        // ignore
+                    }
+                }
+            } else {
+                // TODO: Make sure socket closed?
+                bail!("Online stream receives None");
+            }
+
+            if query_begin.elapsed() > timeout {
+                bail!("Try query onlines timeout {:?}", &timeout);
+            }
+
+            sleep(300.0).await;
+        }
+    }
+
+    #[cfg(test)]
+    mod tests {
+        use hbb_common::tokio;
+
+        #[tokio::test]
+        async fn test_query_onlines() {
+            super::query_online_states(
+                vec![
+                    "152183996".to_owned(),
+                    "165782066".to_owned(),
+                    "155323351".to_owned(),
+                    "460952777".to_owned(),
+                ],
+                |onlines: Vec<String>, offlines: Vec<String>| {
+                    println!("onlines: {:?}, offlines: {:?}", &onlines, &offlines);
+                },
+            )
+            .await;
+        }
+    }
+}
diff --git a/src/flutter.rs b/src/flutter.rs
index d408202a9..03b5a5750 100644
--- a/src/flutter.rs
+++ b/src/flutter.rs
@@ -2093,8 +2093,7 @@ pub(super) mod async_tasks {
                 ids = rx_onlines.recv() => {
                     match ids {
                         Some(_ids) => {
-                            #[cfg(not(any(target_os = "ios")))]
-                            crate::rendezvous_mediator::query_online_states(_ids, handle_query_onlines).await
+                            crate::client::peer_online::query_online_states(_ids, handle_query_onlines).await
                         }
                         None => {
                             break;
diff --git a/src/rendezvous_mediator.rs b/src/rendezvous_mediator.rs
index 4ae222966..bd628ec66 100644
--- a/src/rendezvous_mediator.rs
+++ b/src/rendezvous_mediator.rs
@@ -12,10 +12,7 @@ use uuid::Uuid;
 use hbb_common::{
     allow_err,
     anyhow::{self, bail},
-    config::{
-        self, keys::*, option2bool, Config, CONNECT_TIMEOUT, READ_TIMEOUT, REG_INTERVAL,
-        RENDEZVOUS_PORT,
-    },
+    config::{self, keys::*, option2bool, Config, CONNECT_TIMEOUT, REG_INTERVAL, RENDEZVOUS_PORT},
     futures::future::join_all,
     log,
     protobuf::Message as _,
@@ -703,123 +700,6 @@ async fn direct_server(server: ServerPtr) {
     }
 }
 
-pub async fn query_online_states<F: FnOnce(Vec<String>, Vec<String>)>(ids: Vec<String>, f: F) {
-    let test = false;
-    if test {
-        sleep(1.5).await;
-        let mut onlines = ids;
-        let offlines = onlines.drain((onlines.len() / 2)..).collect();
-        f(onlines, offlines)
-    } else {
-        let query_begin = Instant::now();
-        let query_timeout = std::time::Duration::from_millis(3_000);
-        loop {
-            if SHOULD_EXIT.load(Ordering::SeqCst) {
-                break;
-            }
-            match query_online_states_(&ids, query_timeout).await {
-                Ok((onlines, offlines)) => {
-                    f(onlines, offlines);
-                    break;
-                }
-                Err(e) => {
-                    log::debug!("{}", &e);
-                }
-            }
-
-            if query_begin.elapsed() > query_timeout {
-                log::debug!(
-                    "query onlines timeout {:?} ({:?})",
-                    query_begin.elapsed(),
-                    query_timeout
-                );
-                break;
-            }
-
-            sleep(1.5).await;
-        }
-    }
-}
-
-async fn create_online_stream() -> ResultType<FramedStream> {
-    let (rendezvous_server, _servers, _contained) =
-        crate::get_rendezvous_server(READ_TIMEOUT).await;
-    let tmp: Vec<&str> = rendezvous_server.split(":").collect();
-    if tmp.len() != 2 {
-        bail!("Invalid server address: {}", rendezvous_server);
-    }
-    let port: u16 = tmp[1].parse()?;
-    if port == 0 {
-        bail!("Invalid server address: {}", rendezvous_server);
-    }
-    let online_server = format!("{}:{}", tmp[0], port - 1);
-    connect_tcp(online_server, CONNECT_TIMEOUT).await
-}
-
-async fn query_online_states_(
-    ids: &Vec<String>,
-    timeout: std::time::Duration,
-) -> ResultType<(Vec<String>, Vec<String>)> {
-    let query_begin = Instant::now();
-
-    let mut msg_out = RendezvousMessage::new();
-    msg_out.set_online_request(OnlineRequest {
-        id: Config::get_id(),
-        peers: ids.clone(),
-        ..Default::default()
-    });
-
-    loop {
-        if SHOULD_EXIT.load(Ordering::SeqCst) {
-            // No need to care about onlines
-            return Ok((Vec::new(), Vec::new()));
-        }
-
-        let mut socket = match create_online_stream().await {
-            Ok(s) => s,
-            Err(e) => {
-                log::debug!("Failed to create peers online stream, {e}");
-                return Ok((vec![], ids.clone()));
-            }
-        };
-        if let Err(e) = socket.send(&msg_out).await {
-            log::debug!("Failed to send peers online states query, {e}");
-            return Ok((vec![], ids.clone()));
-        }
-        if let Some(msg_in) = crate::common::get_next_nonkeyexchange_msg(&mut socket, None).await {
-            match msg_in.union {
-                Some(rendezvous_message::Union::OnlineResponse(online_response)) => {
-                    let states = online_response.states;
-                    let mut onlines = Vec::new();
-                    let mut offlines = Vec::new();
-                    for i in 0..ids.len() {
-                        // bytes index from left to right
-                        let bit_value = 0x01 << (7 - i % 8);
-                        if (states[i / 8] & bit_value) == bit_value {
-                            onlines.push(ids[i].clone());
-                        } else {
-                            offlines.push(ids[i].clone());
-                        }
-                    }
-                    return Ok((onlines, offlines));
-                }
-                _ => {
-                    // ignore
-                }
-            }
-        } else {
-            // TODO: Make sure socket closed?
-            bail!("Online stream receives None");
-        }
-
-        if query_begin.elapsed() > timeout {
-            bail!("Try query onlines timeout {:?}", &timeout);
-        }
-
-        sleep(300.0).await;
-    }
-}
-
 enum Sink<'a> {
     Framed(&'a mut FramedSocket, &'a TargetAddr<'a>),
     Stream(&'a mut FramedStream),
@@ -833,24 +713,3 @@ impl Sink<'_> {
         }
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use hbb_common::tokio;
-
-    #[tokio::test]
-    async fn test_query_onlines() {
-        super::query_online_states(
-            vec![
-                "152183996".to_owned(),
-                "165782066".to_owned(),
-                "155323351".to_owned(),
-                "460952777".to_owned(),
-            ],
-            |onlines: Vec<String>, offlines: Vec<String>| {
-                println!("onlines: {:?}, offlines: {:?}", &onlines, &offlines);
-            },
-        )
-        .await;
-    }
-}