diff --git a/client/src/app/packets_table.rs b/client/src/app/packets_table.rs
index f44a03a..917b4c2 100644
--- a/client/src/app/packets_table.rs
+++ b/client/src/app/packets_table.rs
@@ -80,13 +80,20 @@ impl PacketsTable {
         let streams = self.streams.borrow();
         let packets = &streams.packets;
 
+        if packets.is_empty() {
+            return;
+        }
+
+        let first_timestamp = packets.first().unwrap().timestamp;
+        let keys: Vec<_> = packets.keys().collect();
+
         body.rows(25.0, packets.len(), |id, mut row| {
-            let first_ts = packets.get(0).unwrap().timestamp;
-            let packet = packets.get(id).unwrap();
+            let key = **keys.get(id).unwrap();
+            let packet = packets.get(key).unwrap();
             row.col(|ui| {
-                ui.label(id.to_string());
+                ui.label(packet.id.to_string());
             });
-            let timestamp = packet.timestamp - first_ts;
+            let timestamp = packet.timestamp - first_timestamp;
             row.col(|ui| {
                 ui.label(timestamp.as_secs_f64().to_string());
             });
diff --git a/client/src/app/rtcp_packets_table.rs b/client/src/app/rtcp_packets_table.rs
index 3f4a380..a62ffb6 100644
--- a/client/src/app/rtcp_packets_table.rs
+++ b/client/src/app/rtcp_packets_table.rs
@@ -77,7 +77,7 @@ impl RtcpPacketsTable {
         let mut last_id = 0;
         let mut next_ix = 1;
 
-        let first_ts = streams.packets.get(0).unwrap().timestamp;
+        let first_ts = streams.packets.first().unwrap().timestamp;
         body.heterogeneous_rows(heights, |ix, mut row| {
             let (id, rtcp) = rtcp_packets.get(ix).unwrap();
             let packet = streams.packets.get(*id).unwrap();
diff --git a/client/src/streams/packets.rs b/client/src/streams/packets.rs
index ccfb9f8..2c4543e 100644
--- a/client/src/streams/packets.rs
+++ b/client/src/streams/packets.rs
@@ -1,5 +1,8 @@
 use rtpeeker_common::packet::Packet;
-use std::collections::{btree_map::Values, BTreeMap};
+use std::collections::{
+    btree_map::{Keys, Values},
+    BTreeMap,
+};
 
 #[derive(Debug, Default)]
 pub struct Packets {
@@ -11,14 +14,29 @@ impl Packets {
         self.packets.get(&id)
     }
 
+    pub fn first(&self) -> Option<&Packet> {
+        match self.packets.first_key_value() {
+            Some((_, v)) => Some(v),
+            _ => None,
+        }
+    }
+
     pub fn values(&self) -> Values<'_, usize, Packet> {
         self.packets.values()
     }
 
+    pub fn keys(&self) -> Keys<'_, usize, Packet> {
+        self.packets.keys()
+    }
+
     pub fn is_new(&self, packet: &Packet) -> bool {
         !self.packets.contains_key(&packet.id)
     }
 
+    pub fn is_empty(&self) -> bool {
+        self.packets.is_empty()
+    }
+
     pub fn len(&self) -> usize {
         self.packets.len()
     }
diff --git a/client/src/streams/stream.rs b/client/src/streams/stream.rs
index 19a2dc9..4a41092 100644
--- a/client/src/streams/stream.rs
+++ b/client/src/streams/stream.rs
@@ -142,16 +142,15 @@ impl Stream {
             RtcpPacket::ReceiverReport(_rr) => {}
             RtcpPacket::SenderReport(sr) => {
                 // let mut revisit_packets = false;
-                if let Some((ntp_time, rtp_time)) = self.ntp_rtp {
+                if let Some((ntp_time, _rtp_time)) = self.ntp_rtp {
                     // revisit_packets = self.estimated_clock_rate.is_none();
-                    let rtp_diff = sr.rtp_time - rtp_time;
-                    let secs_diff = ntp_to_f64(sr.ntp_time) - ntp_to_f64(ntp_time);
-                    self.estimated_clock_rate = Some(rtp_diff as f64 / secs_diff);
+                    // let rtp_diff = sr.rtp_time - rtp_time;
+                    let _secs_diff = ntp_to_f64(sr.ntp_time) - ntp_to_f64(ntp_time);
+                    // self.estimated_clock_rate = Some(rtp_diff as f64 / secs_diff);
                 } else {
                     // revisit_packets = true;
                 }
-                self.ntp_rtp = Some((sr.ntp_time, sr.rtp_time));
-                // log::info!("EST:{:x?} {:?}", sr.ssrc, self.estimated_clock_rate);
+                // self.ntp_rtp = Some((sr.ntp_time, sr.rtp_time));
                 // TODO: use the estiamted clock rate to set ntp time in rtp_info
                 // TODO: sometimes ntp timestamps are bs
             }
diff --git a/src/server.rs b/src/server.rs
index ab24c09..918d7c6 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -1,5 +1,8 @@
 use crate::sniffer::Sniffer;
-use futures_util::{stream::SplitStream, SinkExt, StreamExt, TryFutureExt};
+use futures_util::{
+    stream::{SplitSink, SplitStream},
+    SinkExt, StreamExt, TryFutureExt,
+};
 use log::{error, info, warn};
 use rtpeeker_common::packet::SessionProtocol;
 use rtpeeker_common::Source;
@@ -10,8 +13,7 @@ use std::sync::{
     atomic::{AtomicUsize, Ordering},
     Arc,
 };
-use tokio::sync::{mpsc, mpsc::UnboundedSender, RwLock};
-use tokio_stream::wrappers::UnboundedReceiverStream;
+use tokio::sync::{mpsc, mpsc::Sender, RwLock};
 use warp::ws::{Message, WebSocket};
 use warp::Filter;
 
@@ -20,12 +22,12 @@ const WS_PATH: &str = "ws";
 static NEXT_CLIENT_ID: AtomicUsize = AtomicUsize::new(1);
 
 struct Client {
-    pub sender: mpsc::UnboundedSender<Message>,
+    pub sender: mpsc::Sender<Message>,
     pub source: Option<Source>,
 }
 
 impl Client {
-    pub fn new(sender: mpsc::UnboundedSender<Message>) -> Self {
+    pub fn new(sender: mpsc::Sender<Message>) -> Self {
         Self {
             sender,
             source: None,
@@ -93,15 +95,16 @@ async fn client_connected(ws: WebSocket, clients: Clients, source_to_packets: Pa
 
     let (mut ws_tx, ws_rx) = ws.split();
 
-    // create channel to send incoming packets to client
-    // and pass it to sniffer via shared state
-    let (mut tx, rx) = mpsc::unbounded_channel();
-    let mut rx = UnboundedReceiverStream::new(rx);
+    send_pcap_filenames(&client_id, &mut ws_tx, &source_to_packets).await;
 
-    send_pcap_filenames(&client_id, &mut tx, &source_to_packets).await;
+    // FIXME: something is very wrong here
+    // if buffer size is > 1, rx.recv always waits
+    // until channel's buffer is full before receiving
+    // might be because of blocking sniffers
+    let (tx, mut rx) = mpsc::channel(1);
 
     tokio::task::spawn(async move {
-        while let Some(message) = rx.next().await {
+        while let Some(message) = rx.recv().await {
             ws_tx
                 .send(message)
                 .unwrap_or_else(|e| {
@@ -121,7 +124,7 @@ async fn client_connected(ws: WebSocket, clients: Clients, source_to_packets: Pa
 
 async fn send_pcap_filenames(
     client_id: &usize,
-    ws_tx: &mut UnboundedSender<Message>,
+    ws_tx: &mut SplitSink<WebSocket, Message>,
     source_to_packets: &Arc<HashMap<Source, Packets>>,
 ) {
     let sources = source_to_packets.keys().cloned().collect();
@@ -133,9 +136,12 @@ async fn send_pcap_filenames(
     };
 
     let msg = Message::binary(encoded);
-    ws_tx.send(msg).unwrap_or_else(|e| {
-        error!("WebSocket send error: {}, client_id: {}", e, client_id);
-    });
+    ws_tx
+        .send(msg)
+        .unwrap_or_else(|e| {
+            error!("WebSocket send error: {}, client_id: {}", e, client_id);
+        })
+        .await;
 }
 
 async fn sniff<T: pcap::Activated>(mut sniffer: Sniffer<T>, packets: Packets, clients: Clients) {
@@ -156,34 +162,36 @@ async fn sniff<T: pcap::Activated>(mut sniffer: Sniffer<T>, packets: Packets, cl
                             source: Some(source),
                             sender,
                         } if *source == sniffer.source => {
-                            sender.send(msg.clone()).unwrap_or_else(|e| {
-                                error!("Sniffer: error while sending packet: {}", e);
-                            })
+                            sender
+                                .send(msg.clone())
+                                .unwrap_or_else(|e| {
+                                    error!("Sniffer: error while sending packet: {}", e);
+                                })
+                                .await;
                         }
                         _ => {}
                     }
                 }
                 packets.write().await.push(response);
             }
-            Err(err) => error!("Error when capturing a packet: {:?}", err),
+            Err(err) => info!("Error when capturing a packet: {:?}", err),
         }
     }
 }
 
-async fn send_all_packets(
-    client_id: usize,
-    packets: &Packets,
-    ws_tx: &mut UnboundedSender<Message>,
-) {
+async fn send_all_packets(client_id: usize, packets: &Packets, ws_tx: &mut Sender<Message>) {
     for pack in packets.read().await.iter() {
         let Ok(encoded) = pack.encode() else {
             error!("Failed to encode packet, client_id: {}", client_id);
             continue;
         };
         let msg = Message::binary(encoded);
-        ws_tx.send(msg).unwrap_or_else(|e| {
-            error!("WebSocket `feed` error: {}, client_id: {}", e, client_id);
-        })
+        ws_tx
+            .send(msg)
+            .unwrap_or_else(|e| {
+                error!("WebSocket `feed` error: {}, client_id: {}", e, client_id);
+            })
+            .await;
     }
 
     info!(
@@ -224,11 +232,16 @@ async fn reparse_packet(
             Client {
                 source: Some(source),
                 sender,
-            } if *source == *cur_source => sender.send(msg.clone()).unwrap_or_else(|e| {
-                error!("Sniffer: error while sending packet: {}", e);
-            }),
+            } if *source == *cur_source => {
+                sender
+                    .send(msg.clone())
+                    .unwrap_or_else(|e| {
+                        error!("Sniffer: error while sending packet: {}", e);
+                    })
+                    .await;
+            }
             _ => {}
-        }
+        };
     }
 }
 
diff --git a/src/sniffer.rs b/src/sniffer.rs
index 8818d1a..bcde763 100644
--- a/src/sniffer.rs
+++ b/src/sniffer.rs
@@ -22,7 +22,7 @@ impl Sniffer<pcap::Offline> {
     pub fn from_file(file: &str) -> Result<Self> {
         match pcap::Capture::from_file(file) {
             Ok(capture) => Ok(Self {
-                packet_id: 0,
+                packet_id: 1,
                 capture,
                 source: Source::File(file.to_string()),
             }),
@@ -37,9 +37,9 @@ impl Sniffer<pcap::Active> {
             return Err(Error::DeviceNotFound);
         };
 
-        match capture.open() {
+        match capture.immediate_mode(true).open() {
             Ok(capture) => Ok(Self {
-                packet_id: 0,
+                packet_id: 1,
                 capture,
                 source: Source::Interface(device.to_string()),
             }),
@@ -56,12 +56,12 @@ impl<T: pcap::Activated> Sniffer<T> {
             Err(_) => return Some(Err(Error::CouldntReceivePacket)),
         };
 
-        match Packet::build(&packet, self.packet_id) {
-            Some(packet) => {
-                self.packet_id += 1;
-                Some(Ok(packet))
-            }
-            None => Some(Err(Error::UnsupportedPacketType)),
-        }
+        let res = match Packet::build(&packet, self.packet_id) {
+            Some(packet) => Ok(packet),
+            None => Err(Error::UnsupportedPacketType),
+        };
+
+        self.packet_id += 1;
+        Some(res)
     }
 }