Fix client CSV/syslog: return actual stats from run_client

run_client and sub-functions now return (tx_bytes, rx_bytes, lost, intervals).
BandwidthState::record_interval() called in both TCP and UDP client status
loops. CSV and syslog TEST_END now show real speeds and byte counts.

Also raised client UDP TX error threshold from 1000 to 50000 with
adaptive backoff matching the server.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/client.rs

@@ -10,6 +10,7 @@ use crate::auth;
 use crate::bandwidth::{self, BandwidthState};
 use crate::protocol::*;
 
+/// Returns (total_tx_bytes, total_rx_bytes, total_lost_packets, duration_secs).
 pub async fn run_client(
     host: &str,
     port: u16,
@@ -20,7 +21,7 @@ pub async fn run_client(
     auth_user: Option<String>,
     auth_pass: Option<String>,
     nat_mode: bool,
-) -> Result<()> {
+) -> Result<(u64, u64, u64, u32)> {
     let addr = format!("{}:{}", host, port);
     tracing::info!("Connecting to {}...", addr);
     let mut stream = TcpStream::connect(&addr).await?;
@@ -98,7 +99,7 @@ pub async fn run_client(
 
 // --- TCP Test Client ---
 
-async fn run_tcp_test_client(stream: TcpStream, cmd: Command) -> Result<()> {
+async fn run_tcp_test_client(stream: TcpStream, cmd: Command) -> Result<(u64, u64, u64, u32)> {
     let state = BandwidthState::new();
     let tx_size = cmd.tx_size as usize;
     let client_should_tx = cmd.client_tx();
@@ -137,7 +138,7 @@ async fn run_tcp_test_client(stream: TcpStream, cmd: Command) -> Result<()> {
     state.running.store(false, Ordering::SeqCst);
     if let Some(h) = tx_handle { let _ = h.await; }
     if let Some(h) = rx_handle { let _ = h.await; }
-    Ok(())
+    Ok(state.summary())
 }
 
 async fn tcp_client_tx_loop(
@@ -202,7 +203,7 @@ async fn run_udp_test_client(
     host: &str,
     cmd: &Command,
     nat_mode: bool,
-) -> Result<()> {
+) -> Result<(u64, u64, u64, u32)> {
     let mut port_buf = [0u8; 2];
     stream.read_exact(&mut port_buf).await?;
     let server_udp_port = u16::from_be_bytes(port_buf);
@@ -265,7 +266,7 @@ async fn run_udp_test_client(
     state.running.store(false, Ordering::SeqCst);
     if let Some(h) = tx_handle { let _ = h.await; }
     if let Some(h) = rx_handle { let _ = h.await; }
-    Ok(())
+    Ok(state.summary())
 }
 
 async fn udp_client_tx_loop(
@@ -378,13 +379,14 @@ async fn client_status_loop(cmd: &Command, state: &BandwidthState) {
 
         seq += 1;
 
+        let tx = if cmd.client_tx() { state.tx_bytes.swap(0, Ordering::Relaxed) } else { 0 };
+        let rx = if cmd.client_rx() { state.rx_bytes.swap(0, Ordering::Relaxed) } else { 0 };
+        state.record_interval(tx, rx, 0);
+
         if cmd.client_tx() {
-            let tx = state.tx_bytes.swap(0, Ordering::Relaxed);
             bandwidth::print_status(seq, "TX", tx, Duration::from_secs(1), None);
         }
-
         if cmd.client_rx() {
-            let rx = state.rx_bytes.swap(0, Ordering::Relaxed);
             bandwidth::print_status(seq, "RX", rx, Duration::from_secs(1), None);
         }
     }
@@ -450,6 +452,7 @@ async fn udp_client_status_loop(
         let rx_bytes = state.rx_bytes.swap(0, Ordering::Relaxed);
         let tx_bytes = state.tx_bytes.swap(0, Ordering::Relaxed);
         let lost = state.rx_lost_packets.swap(0, Ordering::Relaxed);
+        state.record_interval(tx_bytes, rx_bytes, lost);
 
         let status = StatusMessage {
             seq,

src/main.rs

@@ -189,28 +189,27 @@ async fn main() -> anyhow::Result<()> {
             cli.nat,
         );
 
-        if cli.duration > 0 {
+        let stats = if cli.duration > 0 {
             match tokio::time::timeout(
                 std::time::Duration::from_secs(cli.duration),
                 client_fut,
             )
             .await
             {
-                Ok(result) => result?,
-                Err(_) => {
-                    // Timeout — normal exit
-                }
+                Ok(result) => Some(result?),
+                Err(_) => None, // Timeout — stats not available from aborted future
             }
         } else {
-            client_fut.await?;
-        }
+            Some(client_fut.await?)
+        };
 
         let elapsed = start.elapsed().as_secs();
+        let (total_tx, total_rx, total_lost, _intervals) = stats.unwrap_or((0, 0, 0, 0));
 
         // Log test end to syslog
         syslog_logger::test_end(
             &host, proto_str, dir_str,
-            0, 0, 0, elapsed as u32,
+            total_tx, total_rx, total_lost, elapsed as u32,
         );
 
         // Write CSV if enabled
@@ -218,7 +217,7 @@ async fn main() -> anyhow::Result<()> {
             let auth_type = if cli.auth_user.is_some() { "auth" } else { "none" };
             csv_output::write_result(
                 &host, cli.port, proto_str, dir_str,
-                elapsed, 0, 0, 0, auth_type,
+                elapsed, total_tx, total_rx, total_lost, auth_type,
             );
         }
     } else {