Add fipstop TUI monitoring tool with smoothed metrics and quality indices

fipstop: ratatui-based TUI for real-time monitoring of a running FIPS daemon.

Tabs and navigation:
- 8 navigable tabs: Node, Peers, Transports, Sessions, Tree, Filters,
  Performance, Routing
- Tab/BackTab navigation with group separators in tab bar
- Table views with selectable rows, detail drill-down panels, and scrollbars

Node tab:
- Runtime info: pid, exe path, uptime, control socket path, TUN adapter name
- Identity: npub, node_addr, ipv6 address
- State summary with peer/session/link/transport/connection counts
- TUN IPv6 traffic and forwarded transit traffic counters

Peers tab:
- Table with Name, Address, Conn, Depth, SRTT, Loss, LQI, Pkts Tx/Rx
- Detail panel: identity, connection info, transport cross-reference,
  tree/bloom state, link stats, MMP metrics with LQI

Sessions tab:
- Table with Name, Remote Addr, State, Role, SRTT, Loss, SQI, Path MTU,
  Last Activity
- Detail panel: identity, session info, traffic stats, MMP metrics with SQI

Transports tab:
- Hierarchical tree view: expandable transport parents with nested links
  (▼/▶ indicators, ├─/└─ tree chars, Space/Arrow to expand/collapse)
- Transport detail: type-specific stats (UDP/TCP/Ethernet)
- Link detail: peer cross-reference with MMP metrics and LQI

Performance tab:
- Link-layer MMP: SRTT, loss, ETX, LQI, goodput per peer
- Session-layer MMP: SRTT, loss, ETX, SQI, path MTU per session
- Trend indicators (rising/falling/stable) with context-aware coloring

Routing tab:
- Routing state: cache sizes, pending lookups, recent requests
- Coordinate cache: entries, fill ratio, TTL, expiry, avg age
- Statistics: forwarding, discovery request/response, error signal counters

Tree tab:
- Spanning tree position with 16 announce stats (inbound/outbound/cumulative)

Filters tab:
- Bloom filter announce stats, per-peer fill ratio and estimated node count

MMP metrics enhancements:
- Add etx_trend DualEwma for smoothed ETX tracking
- Add smoothed_loss() and smoothed_etx() accessors (long-term EWMA)
- LQI (Link Quality Index) = smoothed_etx * (1 + srtt_ms / 100)
- SQI (Session Quality Index) = same formula for session layer
- All loss/ETX displays prefer smoothed values with raw fallback

Control socket:
- Add smoothed_loss, smoothed_etx, lqi/sqi to show_peers, show_sessions,
  and show_mmp JSON responses
- Rename fips_address to ipv6_addr in show_status and show_peers
- Add tun_name and control_socket to show_status
- FHS-compliant 3-tier default path: $XDG_RUNTIME_DIR, /run/fips, /tmp

Node extensions:
- Add started_at/uptime() to Node
- Add tun_name() accessor

Docker sidecar updates:
- TCP transport support via FIPS_PEER_TRANSPORT env var
- Build scripts include fipstop binary

.github/workflows/ci.yml

@@ -66,6 +66,7 @@ jobs:
           path: |
             target/release/fips
             target/release/fipsctl
+            target/release/fipstop
           retention-days: 1
 
 # ─────────────────────────────────────────────────────────────────────────────
@@ -264,9 +265,10 @@ jobs:
       - name: Install binary (sidecar)
         if: matrix.type == 'sidecar'
         run: |
-          chmod +x _bin/fips _bin/fipsctl
+          chmod +x _bin/fips _bin/fipsctl _bin/fipstop
           cp _bin/fips    testing/sidecar/fips
           cp _bin/fipsctl testing/sidecar/fipsctl
+          cp _bin/fipstop testing/sidecar/fipstop
 
       - name: Run sidecar integration test
         if: matrix.type == 'sidecar'

.gitignore

@@ -15,3 +15,4 @@
 .claude/
 
 deploy/
+vps.env

Cargo.toml

@@ -8,7 +8,12 @@ authors = ["Johnathan Corgan <jcorgan@corganlabs.com>"]
 repository = "https://github.com/jmcorgan/fips"
 readme = "README.md"
 
+[features]
+default = ["tui"]
+tui = ["dep:ratatui"]
+
 [dependencies]
+ratatui = { version = "0.30", optional = true }
 secp256k1 = { version = "0.30", features = ["rand", "global-context"] }
 sha2 = "0.10"
 hkdf = "0.12"
@@ -39,3 +44,8 @@ criterion = { version = "0.8.2", features = ["html_reports"] }
 [[bin]]
 name = "fipsctl"
 path = "src/bin/fipsctl.rs"
+
+[[bin]]
+name = "fipstop"
+path = "src/bin/fipstop/main.rs"
+required-features = ["tui"]

docs/design/fips-configuration.md

@@ -54,7 +54,7 @@ peers:       # Static peer list
 | Parameter | Type | Default | Description |
 |-----------|------|---------|-------------|
 | `node.control.enabled` | bool | `true` | Enable the Unix domain control socket |
-| `node.control.socket_path` | string | *(auto)* | Socket file path. Default: `$XDG_RUNTIME_DIR/fips/control.sock` if `XDG_RUNTIME_DIR` is set, otherwise `/tmp/fips-control.sock` |
+| `node.control.socket_path` | string | *(auto)* | Socket file path. Default: `$XDG_RUNTIME_DIR/fips/control.sock`, then `/run/fips/control.sock` (if root), then `/tmp/fips-control.sock` |
 
 The control socket provides read-only access to node state via the
 `fipsctl` command-line tool. See the project
@@ -480,7 +480,7 @@ node:
     owd_window_size: 32
   control:
     enabled: true
-    socket_path: null                # null = auto ($XDG_RUNTIME_DIR/fips/control.sock or /tmp/fips-control.sock)
+    socket_path: null                # null = auto ($XDG_RUNTIME_DIR → /run/fips → /tmp fallback)
   buffers:
     packet_channel: 1024
     tun_channel: 1024

src/bin/fipsctl.rs

@@ -6,7 +6,7 @@
 use clap::{Parser, Subcommand};
 use std::io::{BufRead, BufReader, Write};
 use std::os::unix::net::UnixStream;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 use std::time::Duration;
 
 /// FIPS control client
@@ -77,7 +77,9 @@ impl ShowCommands {
 /// Determine the default socket path.
 fn default_socket_path() -> PathBuf {
     if let Ok(runtime_dir) = std::env::var("XDG_RUNTIME_DIR") {
-        PathBuf::from(format!("{}/fips/control.sock", runtime_dir))
+        PathBuf::from(format!("{runtime_dir}/fips/control.sock"))
+    } else if Path::new("/run/fips/control.sock").exists() {
+        PathBuf::from("/run/fips/control.sock")
     } else {
         PathBuf::from("/tmp/fips-control.sock")
     }

src/bin/fipstop/app.rs

@@ -0,0 +1,216 @@
+use ratatui::widgets::TableState;
+use std::collections::{HashMap, HashSet};
+use std::time::{Duration, Instant};
+
+#[derive(Clone, Copy, PartialEq, Eq, Hash)]
+pub enum Tab {
+    Node,
+    Peers,
+    Links,
+    Sessions,
+    Tree,
+    Bloom,
+    Mmp,
+    Cache,
+    Transports,
+    Routing,
+}
+
+impl Tab {
+    pub const ALL: [Tab; 8] = [
+        Tab::Node,
+        Tab::Peers,
+        Tab::Transports,
+        Tab::Sessions,
+        Tab::Tree,
+        Tab::Bloom,
+        Tab::Mmp,
+        Tab::Routing,
+    ];
+
+    /// Tab group index: 0 = Node, 1 = Connectivity, 2 = Internals.
+    pub fn group(&self) -> usize {
+        match self {
+            Tab::Node => 0,
+            Tab::Peers | Tab::Transports => 1,
+            _ => 2,
+        }
+    }
+
+    pub fn label(&self) -> &'static str {
+        match self {
+            Tab::Node => "Node",
+            Tab::Peers => "Peers",
+            Tab::Links => "Links",
+            Tab::Sessions => "Sessions",
+            Tab::Tree => "Tree",
+            Tab::Bloom => "Filters",
+            Tab::Mmp => "Performance",
+            Tab::Cache => "Cache",
+            Tab::Transports => "Transports",
+            Tab::Routing => "Routing",
+        }
+    }
+
+    pub fn command(&self) -> &'static str {
+        match self {
+            Tab::Node => "show_status",
+            Tab::Peers => "show_peers",
+            Tab::Links => "show_links",
+            Tab::Sessions => "show_sessions",
+            Tab::Tree => "show_tree",
+            Tab::Bloom => "show_bloom",
+            Tab::Mmp => "show_mmp",
+            Tab::Cache => "show_cache",
+            Tab::Transports => "show_transports",
+            Tab::Routing => "show_routing",
+        }
+    }
+
+    pub fn index(&self) -> usize {
+        Tab::ALL.iter().position(|t| t == self).unwrap()
+    }
+
+    pub fn next(&self) -> Tab {
+        let i = self.index();
+        Tab::ALL[(i + 1) % Tab::ALL.len()]
+    }
+
+    pub fn prev(&self) -> Tab {
+        let i = self.index();
+        Tab::ALL[(i + Tab::ALL.len() - 1) % Tab::ALL.len()]
+    }
+
+    /// The JSON key containing the data array for this tab's response.
+    pub fn command_data_key(&self) -> &'static str {
+        match self {
+            Tab::Peers => "peers",
+            Tab::Links => "links",
+            Tab::Sessions => "sessions",
+            Tab::Transports => "transports",
+            _ => "",
+        }
+    }
+
+    /// Whether this tab has a table view with row selection.
+    pub fn has_table(&self) -> bool {
+        matches!(
+            self,
+            Tab::Peers | Tab::Sessions | Tab::Transports
+        )
+    }
+}
+
+#[derive(Clone)]
+pub enum ConnectionState {
+    Connected,
+    Disconnected(String),
+}
+
+pub struct DetailView {
+    pub scroll: u16,
+}
+
+#[derive(Clone, Copy)]
+pub enum SelectedTreeItem {
+    None,
+    Transport(u64),
+    Link,
+}
+
+pub struct App {
+    pub active_tab: Tab,
+    pub should_quit: bool,
+    pub connection_state: ConnectionState,
+    pub refresh_interval: Duration,
+    pub data: HashMap<Tab, serde_json::Value>,
+    pub table_states: HashMap<Tab, TableState>,
+    pub detail_view: Option<DetailView>,
+    pub last_fetch: Instant,
+    pub last_error: Option<(Instant, String)>,
+    pub expanded_transports: HashSet<u64>,
+    pub tree_row_count: usize,
+    pub selected_tree_item: SelectedTreeItem,
+}
+
+impl App {
+    pub fn new(refresh_interval: Duration) -> Self {
+        Self {
+            active_tab: Tab::Node,
+            should_quit: false,
+            connection_state: ConnectionState::Disconnected("Not yet connected".into()),
+            refresh_interval,
+            data: HashMap::new(),
+            table_states: HashMap::new(),
+            detail_view: None,
+            last_fetch: Instant::now(),
+            last_error: None,
+            expanded_transports: HashSet::new(),
+            tree_row_count: 0,
+            selected_tree_item: SelectedTreeItem::None,
+        }
+    }
+
+    /// Number of rows in the active tab's data array.
+    pub fn row_count(&self) -> usize {
+        if self.active_tab == Tab::Transports {
+            return self.tree_row_count;
+        }
+        let key = self.active_tab.command_data_key();
+        self.data
+            .get(&self.active_tab)
+            .and_then(|v| v.get(key))
+            .and_then(|v| v.as_array())
+            .map(|a| a.len())
+            .unwrap_or(0)
+    }
+
+    /// Move table selection down by one row.
+    pub fn select_next(&mut self) {
+        let count = self.row_count();
+        if count == 0 {
+            return;
+        }
+        let state = self.table_states.entry(self.active_tab).or_default();
+        let i = state.selected().map(|s| (s + 1).min(count - 1)).unwrap_or(0);
+        state.select(Some(i));
+    }
+
+    /// Move table selection up by one row.
+    pub fn select_prev(&mut self) {
+        let count = self.row_count();
+        if count == 0 {
+            return;
+        }
+        let state = self.table_states.entry(self.active_tab).or_default();
+        let i = state.selected().map(|s| s.saturating_sub(1)).unwrap_or(0);
+        state.select(Some(i));
+    }
+
+    /// Open detail view for the currently selected row.
+    pub fn open_detail(&mut self) {
+        let state = self.table_states.get(&self.active_tab);
+        if state.and_then(|s| s.selected()).is_some() {
+            self.detail_view = Some(DetailView { scroll: 0 });
+        }
+    }
+
+    /// Close detail view.
+    pub fn close_detail(&mut self) {
+        self.detail_view = None;
+    }
+
+    /// Scroll detail view down.
+    pub fn scroll_detail_down(&mut self) {
+        if let Some(ref mut dv) = self.detail_view {
+            dv.scroll = dv.scroll.saturating_add(1);
+        }
+    }
+
+    /// Scroll detail view up.
+    pub fn scroll_detail_up(&mut self) {
+        if let Some(ref mut dv) = self.detail_view {
+            dv.scroll = dv.scroll.saturating_sub(1);
+        }
+    }
+}

src/bin/fipstop/client.rs

@@ -0,0 +1,65 @@
+use serde_json::Value;
+use std::path::{Path, PathBuf};
+use std::time::Duration;
+use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
+use tokio::net::UnixStream;
+use tokio::time::timeout;
+
+const IO_TIMEOUT: Duration = Duration::from_secs(5);
+
+pub struct ControlClient {
+    socket_path: PathBuf,
+}
+
+impl ControlClient {
+    pub fn new(socket_path: &Path) -> Self {
+        Self {
+            socket_path: socket_path.to_path_buf(),
+        }
+    }
+
+    pub async fn query(&self, command: &str) -> Result<Value, String> {
+        let stream = timeout(IO_TIMEOUT, UnixStream::connect(&self.socket_path))
+            .await
+            .map_err(|_| "connection timed out".to_string())?
+            .map_err(|e| format!("connect: {e}"))?;
+
+        let (reader, mut writer) = stream.into_split();
+
+        let request = format!("{{\"command\":\"{command}\"}}\n");
+        timeout(IO_TIMEOUT, writer.write_all(request.as_bytes()))
+            .await
+            .map_err(|_| "write timed out".to_string())?
+            .map_err(|e| format!("write: {e}"))?;
+
+        writer
+            .shutdown()
+            .await
+            .map_err(|e| format!("shutdown: {e}"))?;
+
+        let mut buf_reader = BufReader::new(reader);
+        let mut line = String::new();
+        timeout(IO_TIMEOUT, buf_reader.read_line(&mut line))
+            .await
+            .map_err(|_| "read timed out".to_string())?
+            .map_err(|e| format!("read: {e}"))?;
+
+        let response: Value =
+            serde_json::from_str(line.trim()).map_err(|e| format!("parse: {e}"))?;
+
+        let status = response
+            .get("status")
+            .and_then(|v| v.as_str())
+            .unwrap_or("unknown");
+
+        if status == "error" {
+            let msg = response
+                .get("message")
+                .and_then(|v| v.as_str())
+                .unwrap_or("unknown error");
+            return Err(msg.to_string());
+        }
+
+        Ok(response.get("data").cloned().unwrap_or(Value::Null))
+    }
+}

src/bin/fipstop/event.rs

@@ -0,0 +1,51 @@
+use ratatui::crossterm::event::{self, Event as CrosstermEvent, KeyEvent};
+use std::sync::mpsc;
+use std::thread;
+use std::time::Duration;
+
+pub enum Event {
+    Key(KeyEvent),
+    Resize,
+    Tick,
+}
+
+pub struct EventHandler {
+    rx: mpsc::Receiver<Event>,
+}
+
+impl EventHandler {
+    pub fn new(tick_rate: Duration) -> Self {
+        let (tx, rx) = mpsc::channel();
+
+        thread::spawn(move || loop {
+            if event::poll(tick_rate).unwrap_or(false) {
+                if let Ok(evt) = event::read() {
+                    match evt {
+                        CrosstermEvent::Key(key) => {
+                            if tx.send(Event::Key(key)).is_err() {
+                                return;
+                            }
+                        }
+                        CrosstermEvent::Resize(..) => {
+                            if tx.send(Event::Resize).is_err() {
+                                return;
+                            }
+                        }
+                        _ => {}
+                    }
+                }
+            } else {
+                // Poll timed out — send a tick
+                if tx.send(Event::Tick).is_err() {
+                    return;
+                }
+            }
+        });
+
+        Self { rx }
+    }
+
+    pub fn next(&self) -> Result<Event, mpsc::RecvError> {
+        self.rx.recv()
+    }
+}

src/bin/fipstop/main.rs

@@ -0,0 +1,226 @@
+mod app;
+mod client;
+mod event;
+mod ui;
+
+use app::{App, ConnectionState, SelectedTreeItem, Tab};
+use clap::Parser;
+use client::ControlClient;
+use event::{Event, EventHandler};
+use ratatui::crossterm::event::{KeyCode, KeyModifiers};
+use std::path::{Path, PathBuf};
+use std::time::Duration;
+
+/// FIPS mesh monitoring TUI
+#[derive(Parser, Debug)]
+#[command(name = "fipstop", version, about = "Monitor a running FIPS daemon")]
+struct Cli {
+    /// Control socket path override
+    #[arg(short = 's', long)]
+    socket: Option<PathBuf>,
+
+    /// Refresh interval in seconds
+    #[arg(short = 'r', long, default_value = "2")]
+    refresh: u64,
+}
+
+fn default_socket_path() -> PathBuf {
+    if let Ok(runtime_dir) = std::env::var("XDG_RUNTIME_DIR") {
+        PathBuf::from(format!("{runtime_dir}/fips/control.sock"))
+    } else if Path::new("/run/fips/control.sock").exists() {
+        PathBuf::from("/run/fips/control.sock")
+    } else {
+        PathBuf::from("/tmp/fips-control.sock")
+    }
+}
+
+fn restore_terminal() {
+    ratatui::restore();
+}
+
+fn fetch_data(rt: &tokio::runtime::Runtime, client: &ControlClient, app: &mut App) {
+    // Always fetch status for the status bar
+    match rt.block_on(client.query("show_status")) {
+        Ok(data) => {
+            app.data.insert(Tab::Node, data);
+            app.connection_state = ConnectionState::Connected;
+        }
+        Err(e) => {
+            app.connection_state = ConnectionState::Disconnected(e.clone());
+            app.last_error = Some((std::time::Instant::now(), e));
+            return;
+        }
+    }
+
+    // Fetch active tab data (if not Dashboard, which we already fetched)
+    if app.active_tab != Tab::Node {
+        match rt.block_on(client.query(app.active_tab.command())) {
+            Ok(data) => {
+                app.data.insert(app.active_tab, data);
+            }
+            Err(e) => {
+                app.last_error = Some((std::time::Instant::now(), e));
+            }
+        }
+    }
+
+    // Cross-reference fetches for detail views
+    if app.active_tab == Tab::Peers {
+        if let Ok(data) = rt.block_on(client.query("show_links")) {
+            app.data.insert(Tab::Links, data);
+        }
+        if let Ok(data) = rt.block_on(client.query("show_transports")) {
+            app.data.insert(Tab::Transports, data);
+        }
+    }
+    if app.active_tab == Tab::Transports {
+        if let Ok(data) = rt.block_on(client.query("show_links")) {
+            app.data.insert(Tab::Links, data);
+        }
+        if let Ok(data) = rt.block_on(client.query("show_peers")) {
+            app.data.insert(Tab::Peers, data);
+        }
+    }
+    if app.active_tab == Tab::Routing
+        && let Ok(data) = rt.block_on(client.query("show_cache"))
+    {
+        app.data.insert(Tab::Cache, data);
+    }
+
+    app.last_fetch = std::time::Instant::now();
+}
+
+fn main() {
+    let cli = Cli::parse();
+
+    let socket_path = cli.socket.unwrap_or_else(default_socket_path);
+    let refresh = Duration::from_secs(cli.refresh);
+
+    // Install panic hook that restores terminal before printing panic
+    let original_hook = std::panic::take_hook();
+    std::panic::set_hook(Box::new(move |info| {
+        restore_terminal();
+        original_hook(info);
+    }));
+
+    let rt = tokio::runtime::Builder::new_current_thread()
+        .enable_all()
+        .build()
+        .expect("failed to create tokio runtime");
+
+    let client = ControlClient::new(&socket_path);
+    let mut terminal = ratatui::init();
+    let mut app = App::new(refresh);
+    let events = EventHandler::new(refresh);
+
+    // Initial fetch
+    fetch_data(&rt, &client, &mut app);
+
+    // Main loop
+    loop {
+        terminal
+            .draw(|frame| ui::draw(frame, &mut app))
+            .expect("failed to draw frame");
+
+        match events.next() {
+            Ok(Event::Key(key)) => {
+                // Ignore key release events
+                if key.kind != ratatui::crossterm::event::KeyEventKind::Press {
+                    continue;
+                }
+                match (key.code, key.modifiers) {
+                    (KeyCode::Char('q'), _) | (KeyCode::Char('c'), KeyModifiers::CONTROL) => {
+                        app.should_quit = true;
+                    }
+                    (KeyCode::Tab, KeyModifiers::NONE) => {
+                        app.close_detail();
+                        app.active_tab = app.active_tab.next();
+                        fetch_data(&rt, &client, &mut app);
+                    }
+                    (KeyCode::BackTab, _) => {
+                        app.close_detail();
+                        app.active_tab = app.active_tab.prev();
+                        fetch_data(&rt, &client, &mut app);
+                    }
+                    (KeyCode::Down, _) => {
+                        if app.detail_view.is_some() {
+                            app.scroll_detail_down();
+                        } else if app.active_tab.has_table() {
+                            app.select_next();
+                        }
+                    }
+                    (KeyCode::Up, _) => {
+                        if app.detail_view.is_some() {
+                            app.scroll_detail_up();
+                        } else if app.active_tab.has_table() {
+                            app.select_prev();
+                        }
+                    }
+                    (KeyCode::Enter, _) => {
+                        if app.active_tab.has_table() && app.detail_view.is_none() {
+                            app.open_detail();
+                        }
+                    }
+                    (KeyCode::Char(' '), _) | (KeyCode::Right, _) => {
+                        if app.active_tab == Tab::Transports
+                            && app.detail_view.is_none()
+                            && let SelectedTreeItem::Transport(tid) = app.selected_tree_item
+                        {
+                            if app.expanded_transports.contains(&tid) {
+                                app.expanded_transports.remove(&tid);
+                            } else {
+                                app.expanded_transports.insert(tid);
+                            }
+                        }
+                    }
+                    (KeyCode::Left, _) => {
+                        if app.active_tab == Tab::Transports
+                            && app.detail_view.is_none()
+                            && let SelectedTreeItem::Transport(tid) = app.selected_tree_item
+                        {
+                            app.expanded_transports.remove(&tid);
+                        }
+                    }
+                    (KeyCode::Esc, _) => {
+                        if app.detail_view.is_some() {
+                            app.close_detail();
+                        }
+                    }
+                    (KeyCode::Char('e'), KeyModifiers::NONE) => {
+                        if app.active_tab == Tab::Transports
+                            && let Some(data) = app.data.get(&Tab::Transports)
+                            && let Some(arr) = data.get("transports").and_then(|v| v.as_array())
+                        {
+                            for t in arr {
+                                if let Some(tid) = t.get("transport_id").and_then(|v| v.as_u64()) {
+                                    app.expanded_transports.insert(tid);
+                                }
+                            }
+                        }
+                    }
+                    (KeyCode::Char('c'), KeyModifiers::NONE) => {
+                        if app.active_tab == Tab::Transports {
+                            app.expanded_transports.clear();
+                        }
+                    }
+                    _ => {}
+                }
+            }
+            Ok(Event::Resize) => {
+                // Redraw happens at top of loop
+            }
+            Ok(Event::Tick) => {
+                fetch_data(&rt, &client, &mut app);
+            }
+            Err(_) => {
+                app.should_quit = true;
+            }
+        }
+
+        if app.should_quit {
+            break;
+        }
+    }
+
+    restore_terminal();
+}

src/bin/fipstop/ui/bloom.rs

@@ -0,0 +1,150 @@
+use ratatui::Frame;
+use ratatui::layout::{Constraint, Layout, Rect};
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Block, Borders, Paragraph};
+
+use crate::app::{App, Tab};
+
+use super::helpers;
+
+pub fn draw(frame: &mut Frame, app: &App, area: Rect) {
+    let data = match app.data.get(&Tab::Bloom) {
+        Some(d) => d,
+        None => {
+            let msg = Paragraph::new("  Waiting for data...")
+                .style(Style::default().fg(Color::DarkGray));
+            frame.render_widget(msg, area);
+            return;
+        }
+    };
+
+    let chunks = Layout::vertical([
+        Constraint::Length(7),  // Bloom Filter State
+        Constraint::Length(15), // Bloom Announce Stats
+        Constraint::Min(3),    // Peer Filters
+    ])
+    .split(area);
+
+    draw_state(frame, data, chunks[0]);
+    draw_stats(frame, data, chunks[1]);
+    draw_peer_filters(frame, data, chunks[2]);
+}
+
+fn draw_state(frame: &mut Frame, data: &serde_json::Value, area: Rect) {
+    let lines = vec![
+        helpers::kv_line(
+            "Node Addr",
+            &helpers::truncate_hex(helpers::str_field(data, "own_node_addr"), 16),
+        ),
+        helpers::kv_line("Leaf Only", helpers::bool_field(data, "is_leaf_only")),
+        helpers::kv_line("Sequence", &helpers::u64_field(data, "sequence")),
+        helpers::kv_line(
+            "Leaf Deps",
+            &helpers::u64_field(data, "leaf_dependent_count"),
+        ),
+    ];
+
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" Bloom Filter State ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+    frame.render_widget(Paragraph::new(lines), inner);
+}
+
+fn draw_stats(frame: &mut Frame, data: &serde_json::Value, area: Rect) {
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" Bloom Announce Stats ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    let mut lines = vec![
+        helpers::section_header("Inbound"),
+        helpers::kv_line("Received", &helpers::nested_u64(data, "stats", "received")),
+        helpers::kv_line("Accepted", &helpers::nested_u64(data, "stats", "accepted")),
+        helpers::kv_line("Decode Error", &helpers::nested_u64(data, "stats", "decode_error")),
+        helpers::kv_line("Invalid", &helpers::nested_u64(data, "stats", "invalid")),
+        helpers::kv_line("Non-V1", &helpers::nested_u64(data, "stats", "non_v1")),
+        helpers::kv_line("Unknown Peer", &helpers::nested_u64(data, "stats", "unknown_peer")),
+        helpers::kv_line("Stale", &helpers::nested_u64(data, "stats", "stale")),
+        Line::from(""),
+        helpers::section_header("Outbound"),
+        helpers::kv_line("Sent", &helpers::nested_u64(data, "stats", "sent")),
+        helpers::kv_line("Debounce Suppressed", &helpers::nested_u64(data, "stats", "debounce_suppressed")),
+        helpers::kv_line("Send Failed", &helpers::nested_u64(data, "stats", "send_failed")),
+    ];
+
+    let max_lines = inner.height as usize;
+    lines.truncate(max_lines);
+
+    frame.render_widget(Paragraph::new(lines), inner);
+}
+
+fn draw_peer_filters(frame: &mut Frame, data: &serde_json::Value, area: Rect) {
+    let filters = data
+        .get("peer_filters")
+        .and_then(|v| v.as_array())
+        .cloned()
+        .unwrap_or_default();
+
+    let count = filters.len();
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(format!(" Peer Filters ({count}) "));
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    if filters.is_empty() {
+        let msg =
+            Paragraph::new("  No peers").style(Style::default().fg(Color::DarkGray));
+        frame.render_widget(msg, inner);
+        return;
+    }
+
+    let lines: Vec<Line> = filters
+        .iter()
+        .map(|f| {
+            let name = helpers::str_field(f, "display_name");
+            let seq = helpers::u64_field(f, "filter_sequence");
+            let has = f
+                .get("has_filter")
+                .and_then(|v| v.as_bool())
+                .unwrap_or(false);
+
+            let mut spans = vec![
+                Span::styled(
+                    format!("    {name:<16}"),
+                    Style::default().add_modifier(Modifier::BOLD),
+                ),
+                Span::styled("seq: ", Style::default().fg(Color::DarkGray)),
+                Span::raw(format!("{seq:<6}")),
+            ];
+
+            if has {
+                let fill = f
+                    .get("fill_ratio")
+                    .and_then(|v| v.as_f64())
+                    .map(|r| format!("{:.1}%", r * 100.0))
+                    .unwrap_or_else(|| "-".into());
+                let est = f
+                    .get("estimated_count")
+                    .and_then(|v| v.as_f64())
+                    .map(|n| format!("{:.0}", n))
+                    .unwrap_or_else(|| "-".into());
+                spans.push(Span::styled("fill: ", Style::default().fg(Color::DarkGray)));
+                spans.push(Span::raw(format!("{fill:<8}")));
+                spans.push(Span::styled("est: ", Style::default().fg(Color::DarkGray)));
+                spans.push(Span::raw(format!("{est:<6}")));
+                spans.push(Span::styled("ok", Style::default().fg(Color::Green)));
+            } else {
+                spans.push(Span::styled("none", Style::default().fg(Color::Red)));
+            }
+
+            Line::from(spans)
+        })
+        .collect();
+
+    frame.render_widget(Paragraph::new(lines), inner);
+}

src/bin/fipstop/ui/dashboard.rs

@@ -0,0 +1,209 @@
+use ratatui::Frame;
+use ratatui::layout::{Constraint, Layout, Rect};
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Block, Borders, Paragraph};
+
+use crate::app::App;
+
+use super::helpers;
+
+pub fn draw(frame: &mut Frame, app: &App, area: Rect) {
+    let data = match app.data.get(&crate::app::Tab::Node) {
+        Some(d) => d,
+        None => {
+            let msg = Paragraph::new("  Waiting for data...")
+                .style(Style::default().fg(Color::DarkGray));
+            frame.render_widget(msg, area);
+            return;
+        }
+    };
+
+    let chunks = Layout::vertical([
+        Constraint::Length(7),  // Runtime
+        Constraint::Length(7),  // Identity
+        Constraint::Length(5),  // State
+        Constraint::Length(9),  // Traffic
+        Constraint::Min(0),    // remaining
+    ])
+    .split(area);
+
+    draw_runtime(frame, data, chunks[0]);
+    draw_identity(frame, data, chunks[1]);
+    draw_state(frame, data, chunks[2]);
+    draw_node_stats(frame, data, chunks[3]);
+}
+
+fn draw_runtime(frame: &mut Frame, data: &serde_json::Value, area: Rect) {
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" Runtime ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    let pid = helpers::u64_field(data, "pid");
+    let exe = helpers::str_field(data, "exe_path");
+    let uptime_secs = data.get("uptime_secs").and_then(|v| v.as_u64()).unwrap_or(0);
+    let uptime = format_uptime(uptime_secs);
+    let socket = helpers::str_field(data, "control_socket");
+    let tun_name = helpers::str_field(data, "tun_name");
+
+    let label = Style::default().fg(Color::DarkGray);
+
+    let lines = vec![
+        Line::from(vec![
+            Span::styled(" pid: ", label),
+            Span::raw(pid),
+            Span::styled("  uptime: ", label),
+            Span::raw(uptime),
+        ]),
+        Line::from(vec![
+            Span::styled(" exe: ", label),
+            Span::raw(exe.to_string()),
+        ]),
+        Line::from(vec![
+            Span::styled(" ctl: ", label),
+            Span::raw(socket.to_string()),
+        ]),
+        Line::from(vec![
+            Span::styled(" tun: ", label),
+            Span::raw(tun_name.to_string()),
+        ]),
+    ];
+
+    frame.render_widget(Paragraph::new(lines), inner);
+}
+
+fn draw_identity(frame: &mut Frame, data: &serde_json::Value, area: Rect) {
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" Identity ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    let npub = helpers::str_field(data, "npub");
+    let node_addr = helpers::str_field(data, "node_addr");
+    let ipv6_addr = helpers::str_field(data, "ipv6_addr");
+
+    let label = Style::default().fg(Color::DarkGray);
+
+    let lines = vec![
+        Line::from(vec![
+            Span::styled(" npub:      ", label),
+            Span::raw(npub.to_string()),
+        ]),
+        Line::from(vec![
+            Span::styled(" node_addr: ", label),
+            Span::raw(node_addr.to_string()),
+        ]),
+        Line::from(vec![
+            Span::styled(" ipv6:      ", label),
+            Span::raw(ipv6_addr.to_string()),
+        ]),
+    ];
+
+    frame.render_widget(Paragraph::new(lines), inner);
+}
+
+fn draw_state(frame: &mut Frame, data: &serde_json::Value, area: Rect) {
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" State ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    let state = helpers::str_field(data, "state");
+    let tun = helpers::str_field(data, "tun_state");
+    let mtu = helpers::u64_field(data, "effective_ipv6_mtu");
+    let leaf = helpers::bool_field(data, "is_leaf_only");
+
+    let label = Style::default().fg(Color::DarkGray);
+    let count = Style::default()
+        .fg(Color::Cyan)
+        .add_modifier(Modifier::BOLD);
+
+    let peers = helpers::u64_field(data, "peer_count");
+    let sessions = helpers::u64_field(data, "session_count");
+    let links = helpers::u64_field(data, "link_count");
+    let transports = helpers::u64_field(data, "transport_count");
+    let connections = helpers::u64_field(data, "connection_count");
+
+    let lines = vec![
+        Line::from(vec![
+            Span::styled(" state: ", label),
+            Span::raw(state.to_string()),
+            Span::styled("  tun: ", label),
+            Span::raw(tun.to_string()),
+            Span::styled("  mtu: ", label),
+            Span::raw(mtu),
+            Span::styled("  leaf: ", label),
+            Span::raw(leaf.to_string()),
+        ]),
+        Line::from(vec![
+            Span::styled(" peers: ", label),
+            Span::styled(peers, count),
+            Span::styled("  sessions: ", label),
+            Span::styled(sessions, count),
+            Span::styled("  links: ", label),
+            Span::styled(links, count),
+            Span::styled("  transports: ", label),
+            Span::styled(transports, count),
+            Span::styled("  connections: ", label),
+            Span::styled(connections, count),
+        ]),
+    ];
+
+    frame.render_widget(Paragraph::new(lines), inner);
+}
+
+fn draw_node_stats(frame: &mut Frame, data: &serde_json::Value, area: Rect) {
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" Traffic ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    let lines = vec![
+        helpers::section_header("TUN (IPv6)"),
+        fwd_line(data, "Tx", "delivered_packets", "delivered_bytes"),
+        fwd_line(data, "Rx", "originated_packets", "originated_bytes"),
+        Line::from(""),
+        helpers::section_header("Forwarded (transit)"),
+        fwd_line(data, "Packets", "forwarded_packets", "forwarded_bytes"),
+    ];
+
+    frame.render_widget(Paragraph::new(lines), inner);
+}
+
+/// Format a forwarding counter as "N pkts (formatted_bytes)".
+fn fwd_line(data: &serde_json::Value, label: &str, pkt_key: &str, byte_key: &str) -> Line<'static> {
+    let pkts = data
+        .get("forwarding")
+        .and_then(|f| f.get(pkt_key))
+        .and_then(|v| v.as_u64())
+        .unwrap_or(0);
+    let bytes = data
+        .get("forwarding")
+        .and_then(|f| f.get(byte_key))
+        .and_then(|v| v.as_u64())
+        .unwrap_or(0);
+    helpers::kv_line(label, &format!("{} pkts ({})", pkts, helpers::format_bytes(bytes)))
+}
+
+/// Format seconds as human-readable uptime (e.g., "3d 2h 15m 4s").
+fn format_uptime(secs: u64) -> String {
+    let days = secs / 86400;
+    let hours = (secs % 86400) / 3600;
+    let mins = (secs % 3600) / 60;
+    let s = secs % 60;
+
+    if days > 0 {
+        format!("{days}d {hours}h {mins}m {s}s")
+    } else if hours > 0 {
+        format!("{hours}h {mins}m {s}s")
+    } else if mins > 0 {
+        format!("{mins}m {s}s")
+    } else {
+        format!("{s}s")
+    }
+}

src/bin/fipstop/ui/helpers.rs

@@ -0,0 +1,171 @@
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use serde_json::Value;
+
+/// Extract a string field from JSON, returning "-" if missing.
+pub fn str_field<'a>(data: &'a Value, key: &str) -> &'a str {
+    data.get(key).and_then(|v| v.as_str()).unwrap_or("-")
+}
+
+/// Extract a u64 field from JSON, returning "-" if missing.
+pub fn u64_field(data: &Value, key: &str) -> String {
+    data.get(key)
+        .and_then(|v| v.as_u64())
+        .map(|n| n.to_string())
+        .unwrap_or_else(|| "-".into())
+}
+
+/// Truncate a hex string to the given length, adding "..." if truncated.
+pub fn truncate_hex(s: &str, max_len: usize) -> String {
+    if s.len() <= max_len {
+        s.to_string()
+    } else {
+        format!("{}...", &s[..max_len.saturating_sub(3)])
+    }
+}
+
+/// Format bytes-per-second with engineering units (B/s, KB/s, MB/s, GB/s) and 3 significant digits.
+pub fn format_throughput(bytes_per_sec: f64) -> String {
+    if bytes_per_sec < 0.0 {
+        return "0 B/s".into();
+    }
+    let (scaled, unit) = if bytes_per_sec < 1_000.0 {
+        (bytes_per_sec, "B/s")
+    } else if bytes_per_sec < 1_000_000.0 {
+        (bytes_per_sec / 1_000.0, "KB/s")
+    } else if bytes_per_sec < 1_000_000_000.0 {
+        (bytes_per_sec / 1_000_000.0, "MB/s")
+    } else {
+        (bytes_per_sec / 1_000_000_000.0, "GB/s")
+    };
+    let decimals = if scaled >= 100.0 {
+        0
+    } else if scaled >= 10.0 {
+        1
+    } else {
+        2
+    };
+    format!("{:.prec$} {unit}", scaled, prec = decimals)
+}
+
+/// Extract a nested f64 field and format as engineering-unit throughput.
+pub fn nested_throughput(data: &Value, outer: &str, inner: &str) -> String {
+    data.get(outer)
+        .and_then(|o| o.get(inner))
+        .and_then(|v| v.as_f64())
+        .map(format_throughput)
+        .unwrap_or_else(|| "-".into())
+}
+
+/// Format a byte count as human-readable (B, KB, MB, GB).
+pub fn format_bytes(bytes: u64) -> String {
+    if bytes < 1024 {
+        format!("{bytes}B")
+    } else if bytes < 1024 * 1024 {
+        format!("{:.1}KB", bytes as f64 / 1024.0)
+    } else if bytes < 1024 * 1024 * 1024 {
+        format!("{:.1}MB", bytes as f64 / (1024.0 * 1024.0))
+    } else {
+        format!("{:.2}GB", bytes as f64 / (1024.0 * 1024.0 * 1024.0))
+    }
+}
+
+/// Format millisecond timestamp as relative duration from now (e.g., "3.2s ago").
+pub fn format_elapsed_ms(ms: u64) -> String {
+    let now_ms = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap_or_default()
+        .as_millis() as u64;
+    if ms == 0 || ms > now_ms {
+        return "-".into();
+    }
+    let elapsed = now_ms - ms;
+    if elapsed < 1000 {
+        format!("{elapsed}ms")
+    } else if elapsed < 60_000 {
+        format!("{:.1}s", elapsed as f64 / 1000.0)
+    } else if elapsed < 3_600_000 {
+        format!("{:.1}m", elapsed as f64 / 60_000.0)
+    } else {
+        format!("{:.1}h", elapsed as f64 / 3_600_000.0)
+    }
+}
+
+/// Get a nested string field.
+pub fn nested_str(data: &Value, outer: &str, inner: &str) -> String {
+    data.get(outer)
+        .and_then(|o| o.get(inner))
+        .and_then(|v| v.as_str())
+        .unwrap_or("-")
+        .to_string()
+}
+
+/// Get a nested field value (e.g., "stats.packets_sent").
+pub fn nested_u64(data: &Value, outer: &str, inner: &str) -> String {
+    data.get(outer)
+        .and_then(|o| o.get(inner))
+        .and_then(|v| v.as_u64())
+        .map(|n| n.to_string())
+        .unwrap_or_else(|| "-".into())
+}
+
+/// Get a nested f64 field formatted to given decimal places.
+pub fn nested_f64(data: &Value, outer: &str, inner: &str, decimals: usize) -> String {
+    data.get(outer)
+        .and_then(|o| o.get(inner))
+        .and_then(|v| v.as_f64())
+        .map(|n| format!("{:.prec$}", n, prec = decimals))
+        .unwrap_or_else(|| "-".into())
+}
+
+/// Get a nested f64 field, preferring `preferred` key with fallback to `fallback` key.
+pub fn nested_f64_prefer(data: &Value, outer: &str, preferred: &str, fallback: &str, decimals: usize) -> String {
+    data.get(outer)
+        .and_then(|o| o.get(preferred).or_else(|| o.get(fallback)))
+        .and_then(|v| v.as_f64())
+        .map(|n| format!("{:.prec$}", n, prec = decimals))
+        .unwrap_or_else(|| "-".into())
+}
+
+/// Extract a bool field from JSON, returning "yes"/"no" or "-" if missing.
+pub fn bool_field(data: &Value, key: &str) -> &'static str {
+    data.get(key)
+        .and_then(|v| v.as_bool())
+        .map(|b| if b { "yes" } else { "no" })
+        .unwrap_or("-")
+}
+
+/// Format a duration in milliseconds as compact string (e.g., "42ms", "3.2s", "5.0m").
+pub fn format_duration_ms(ms: u64) -> String {
+    if ms < 1000 {
+        format!("{ms}ms")
+    } else if ms < 60_000 {
+        format!("{:.1}s", ms as f64 / 1000.0)
+    } else if ms < 3_600_000 {
+        format!("{:.1}m", ms as f64 / 60_000.0)
+    } else {
+        format!("{:.1}h", ms as f64 / 3_600_000.0)
+    }
+}
+
+/// Section header line for detail views.
+pub fn section_header(title: &str) -> Line<'static> {
+    Line::from(Span::styled(
+        format!("  {title}"),
+        Style::default()
+            .fg(Color::Cyan)
+            .add_modifier(Modifier::BOLD),
+    ))
+}
+
+/// Key-value line for detail views.
+pub fn kv_line(key: &str, value: &str) -> Line<'static> {
+    Line::from(vec![
+        Span::styled(
+            format!("    {key}: "),
+            Style::default().fg(Color::DarkGray),
+        ),
+        Span::raw(value.to_string()),
+    ])
+}
+

src/bin/fipstop/ui/mmp.rs

@@ -0,0 +1,237 @@
+use ratatui::Frame;
+use ratatui::layout::{Constraint, Layout, Rect};
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Block, Borders, Paragraph};
+
+use crate::app::{App, Tab};
+
+use super::helpers;
+
+pub fn draw(frame: &mut Frame, app: &App, area: Rect) {
+    let data = match app.data.get(&Tab::Mmp) {
+        Some(d) => d,
+        None => {
+            let msg = Paragraph::new("  Waiting for data...")
+                .style(Style::default().fg(Color::DarkGray));
+            frame.render_widget(msg, area);
+            return;
+        }
+    };
+
+    let chunks = Layout::vertical([
+        Constraint::Percentage(60),
+        Constraint::Percentage(40),
+    ])
+    .split(area);
+
+    draw_link_mmp(frame, data, chunks[0]);
+    draw_session_mmp(frame, data, chunks[1]);
+}
+
+fn draw_link_mmp(frame: &mut Frame, data: &serde_json::Value, area: Rect) {
+    let peers = data
+        .get("peers")
+        .and_then(|v| v.as_array())
+        .cloned()
+        .unwrap_or_default();
+
+    let count = peers.len();
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(format!(" Link MMP ({count} peers) "));
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    if peers.is_empty() {
+        let msg =
+            Paragraph::new("  No peers").style(Style::default().fg(Color::DarkGray));
+        frame.render_widget(msg, inner);
+        return;
+    }
+
+    let mut lines: Vec<Line> = Vec::new();
+    for peer in &peers {
+        let name = helpers::str_field(peer, "display_name");
+        let ll = peer.get("link_layer");
+
+        let srtt = ll
+            .and_then(|l| l.get("srtt_ms"))
+            .and_then(|v| v.as_f64())
+            .map(|v| format!("{:.1}ms", v))
+            .unwrap_or_else(|| "-".into());
+        let loss = ll
+            .and_then(|l| l.get("smoothed_loss").or_else(|| l.get("loss_rate")))
+            .and_then(|v| v.as_f64())
+            .map(|v| format!("{:.4}", v))
+            .unwrap_or_else(|| "-".into());
+        let etx = ll
+            .and_then(|l| l.get("smoothed_etx").or_else(|| l.get("etx")))
+            .and_then(|v| v.as_f64())
+            .map(|v| format!("{:.2}", v))
+            .unwrap_or_else(|| "-".into());
+        let lqi = ll
+            .and_then(|l| l.get("lqi"))
+            .and_then(|v| v.as_f64())
+            .map(|v| format!("{:.2}", v))
+            .unwrap_or_else(|| "-".into());
+        let goodput = ll
+            .and_then(|l| l.get("goodput_bps"))
+            .and_then(|v| v.as_f64())
+            .map(helpers::format_throughput)
+            .unwrap_or_else(|| "-".into());
+
+        // Line 1: primary metrics
+        lines.push(Line::from(vec![
+            Span::styled(
+                format!("  {name:<16}"),
+                Style::default()
+                    .fg(Color::Yellow)
+                    .add_modifier(Modifier::BOLD),
+            ),
+            Span::styled("srtt: ", Style::default().fg(Color::DarkGray)),
+            Span::raw(format!("{srtt:<10}")),
+            Span::styled("loss: ", Style::default().fg(Color::DarkGray)),
+            Span::raw(format!("{loss:<8}")),
+            Span::styled("etx: ", Style::default().fg(Color::DarkGray)),
+            Span::raw(format!("{etx:<6}")),
+            Span::styled("lqi: ", Style::default().fg(Color::DarkGray)),
+            Span::raw(format!("{lqi:<8}")),
+            Span::styled("gp: ", Style::default().fg(Color::DarkGray)),
+            Span::raw(goodput),
+        ]));
+
+        // Line 2: trends
+        if let Some(ll_val) = ll {
+            let mut trend_spans: Vec<Span> = vec![Span::raw("    ")];
+            let mut has_trends = false;
+
+            for (label, key, bad_rising) in [
+                ("rtt", "rtt_trend", true),
+                ("loss", "loss_trend", true),
+                ("goodput", "goodput_trend", false),
+                ("jitter", "jitter_trend", true),
+            ] {
+                if let Some(trend) = ll_val.get(key).and_then(|v| v.as_str()) {
+                    if has_trends {
+                        trend_spans.push(Span::raw("  "));
+                    }
+                    trend_spans.push(Span::styled(
+                        format!("{label}: "),
+                        Style::default().fg(Color::DarkGray),
+                    ));
+                    trend_spans.push(Span::styled(
+                        trend.to_string(),
+                        Style::default().fg(trend_color(trend, bad_rising)),
+                    ));
+                    has_trends = true;
+                }
+            }
+
+            if has_trends {
+                lines.push(Line::from(trend_spans));
+            }
+        }
+    }
+
+    frame.render_widget(Paragraph::new(lines), inner);
+}
+
+fn draw_session_mmp(frame: &mut Frame, data: &serde_json::Value, area: Rect) {
+    let sessions = data
+        .get("sessions")
+        .and_then(|v| v.as_array())
+        .cloned()
+        .unwrap_or_default();
+
+    let count = sessions.len();
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(format!(" Session MMP ({count} sessions) "));
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    if sessions.is_empty() {
+        let msg = Paragraph::new("  No sessions")
+            .style(Style::default().fg(Color::DarkGray));
+        frame.render_widget(msg, inner);
+        return;
+    }
+
+    let lines: Vec<Line> = sessions
+        .iter()
+        .map(|s| {
+            let name = helpers::str_field(s, "display_name");
+            let sl = s.get("session_layer");
+
+            let srtt = sl
+                .and_then(|l| l.get("srtt_ms"))
+                .and_then(|v| v.as_f64())
+                .map(|v| format!("{:.1}ms", v))
+                .unwrap_or_else(|| "-".into());
+            let loss = sl
+                .and_then(|l| l.get("smoothed_loss").or_else(|| l.get("loss_rate")))
+                .and_then(|v| v.as_f64())
+                .map(|v| format!("{:.4}", v))
+                .unwrap_or_else(|| "-".into());
+            let etx = sl
+                .and_then(|l| l.get("smoothed_etx").or_else(|| l.get("etx")))
+                .and_then(|v| v.as_f64())
+                .map(|v| format!("{:.2}", v))
+                .unwrap_or_else(|| "-".into());
+            let sqi = sl
+                .and_then(|l| l.get("sqi"))
+                .and_then(|v| v.as_f64())
+                .map(|v| format!("{:.2}", v))
+                .unwrap_or_else(|| "-".into());
+            let mtu = sl
+                .and_then(|l| l.get("path_mtu"))
+                .and_then(|v| v.as_u64())
+                .map(|v| v.to_string())
+                .unwrap_or_else(|| "-".into());
+
+            Line::from(vec![
+                Span::styled(
+                    format!("  {name:<16}"),
+                    Style::default()
+                        .fg(Color::Yellow)
+                        .add_modifier(Modifier::BOLD),
+                ),
+                Span::styled("srtt: ", Style::default().fg(Color::DarkGray)),
+                Span::raw(format!("{srtt:<10}")),
+                Span::styled("loss: ", Style::default().fg(Color::DarkGray)),
+                Span::raw(format!("{loss:<8}")),
+                Span::styled("etx: ", Style::default().fg(Color::DarkGray)),
+                Span::raw(format!("{etx:<6}")),
+                Span::styled("sqi: ", Style::default().fg(Color::DarkGray)),
+                Span::raw(format!("{sqi:<8}")),
+                Span::styled("mtu: ", Style::default().fg(Color::DarkGray)),
+                Span::raw(mtu),
+            ])
+        })
+        .collect();
+
+    frame.render_widget(Paragraph::new(lines), inner);
+}
+
+/// Color a trend value based on whether "rising" is bad or good for this metric.
+fn trend_color(trend: &str, bad_rising: bool) -> Color {
+    match trend {
+        "rising" => {
+            if bad_rising {
+                Color::Red
+            } else {
+                Color::Green
+            }
+        }
+        "falling" => {
+            if bad_rising {
+                Color::Green
+            } else {
+                Color::Red
+            }
+        }
+        _ => Color::DarkGray, // "stable"
+    }
+}
+

src/bin/fipstop/ui/mod.rs

@@ -0,0 +1,99 @@
+mod bloom;
+mod dashboard;
+mod helpers;
+mod mmp;
+mod peers;
+mod routing;
+mod sessions;
+mod transports;
+mod tree;
+
+use ratatui::Frame;
+use ratatui::layout::{Constraint, Layout, Rect};
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Block, Borders, Paragraph};
+
+use crate::app::{App, ConnectionState, Tab};
+
+pub fn draw(frame: &mut Frame, app: &mut App) {
+    let chunks = Layout::vertical([
+        Constraint::Length(3), // tab bar
+        Constraint::Min(1),   // content
+        Constraint::Length(1), // status bar
+    ])
+    .split(frame.area());
+
+    draw_tab_bar(frame, app, chunks[0]);
+    draw_content(frame, app, chunks[1]);
+    draw_status_bar(frame, app, chunks[2]);
+}
+
+fn draw_tab_bar(frame: &mut Frame, app: &App, area: Rect) {
+    let block = Block::default().borders(Borders::ALL).title(" fipstop ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    let highlight = Style::default()
+        .fg(Color::Yellow)
+        .add_modifier(Modifier::BOLD);
+    let normal = Style::default().fg(Color::White);
+    let divider = Style::default().fg(Color::DarkGray);
+    let group_sep = Style::default().fg(Color::DarkGray);
+
+    let mut spans: Vec<Span> = Vec::new();
+    for (i, tab) in Tab::ALL.iter().enumerate() {
+        if i > 0 {
+            if tab.group() != Tab::ALL[i - 1].group() {
+                spans.push(Span::styled(" \u{2502} ", group_sep));
+            } else {
+                spans.push(Span::styled(" | ", divider));
+            }
+        }
+        let style = if *tab == app.active_tab { highlight } else { normal };
+        spans.push(Span::styled(tab.label(), style));
+    }
+
+    let line = Line::from(spans);
+    frame.render_widget(Paragraph::new(line), inner);
+}
+
+fn draw_content(frame: &mut Frame, app: &mut App, area: Rect) {
+    match app.active_tab {
+        Tab::Node => dashboard::draw(frame, app, area),
+        Tab::Peers => peers::draw(frame, app, area),
+        Tab::Sessions => sessions::draw(frame, app, area),
+        Tab::Transports => transports::draw(frame, app, area),
+        Tab::Tree => tree::draw(frame, app, area),
+        Tab::Bloom => bloom::draw(frame, app, area),
+        Tab::Mmp => mmp::draw(frame, app, area),
+        Tab::Cache => {} // data stored for Routing tab cross-reference
+        Tab::Routing => routing::draw(frame, app, area),
+        Tab::Links => {} // not a navigable tab; data stored for cross-references
+    }
+}
+
+fn draw_status_bar(frame: &mut Frame, app: &App, area: Rect) {
+    let conn = match &app.connection_state {
+        ConnectionState::Connected => {
+            Span::styled(" Connected ", Style::default().fg(Color::Green))
+        }
+        ConnectionState::Disconnected(msg) => Span::styled(
+            format!(" Disconnected: {} ", msg),
+            Style::default().fg(Color::Red),
+        ),
+    };
+
+    let elapsed = app.last_fetch.elapsed();
+    let timing = Span::raw(format!(
+        "| Refresh: {}s | Updated: {:.1}s ago ",
+        app.refresh_interval.as_secs(),
+        elapsed.as_secs_f64()
+    ));
+
+    let help = Span::styled("[?] Help ", Style::default().fg(Color::DarkGray));
+
+    let line = Line::from(vec![conn, timing, help]);
+    let bar = Paragraph::new(line);
+    frame.render_widget(bar, area);
+}

src/bin/fipstop/ui/peers.rs

@@ -0,0 +1,273 @@
+use ratatui::Frame;
+use ratatui::layout::{Constraint, Layout, Rect};
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Block, Borders, Cell, Paragraph, Row, Scrollbar, ScrollbarOrientation, ScrollbarState, Table};
+
+use crate::app::{App, Tab};
+
+use super::helpers;
+
+pub fn draw(frame: &mut Frame, app: &mut App, area: Rect) {
+    let peers = get_peers(app);
+    let row_count = peers.len();
+
+    if app.detail_view.is_some() {
+        // Split: left 40% table, right 60% detail
+        let chunks = Layout::horizontal([
+            Constraint::Percentage(40),
+            Constraint::Percentage(60),
+        ])
+        .split(area);
+
+        draw_table(frame, app, chunks[0], &peers, row_count);
+        draw_detail(frame, app, chunks[1], &peers);
+    } else {
+        draw_table(frame, app, area, &peers, row_count);
+    }
+}
+
+fn get_peers(app: &App) -> Vec<serde_json::Value> {
+    app.data
+        .get(&Tab::Peers)
+        .and_then(|v| v.get("peers"))
+        .and_then(|v| v.as_array())
+        .cloned()
+        .unwrap_or_default()
+}
+
+fn draw_table(frame: &mut Frame, app: &mut App, area: Rect, peers: &[serde_json::Value], row_count: usize) {
+    let header = Row::new(vec![
+        Cell::from("Name"),
+        Cell::from("Address"),
+        Cell::from("Conn"),
+        Cell::from("Depth"),
+        Cell::from("SRTT"),
+        Cell::from("Loss"),
+        Cell::from("LQI"),
+        Cell::from("Pkts Tx"),
+        Cell::from("Pkts Rx"),
+    ])
+    .style(
+        Style::default()
+            .fg(Color::Yellow)
+            .add_modifier(Modifier::BOLD),
+    );
+
+    let rows: Vec<Row> = peers
+        .iter()
+        .map(|peer| {
+            let name = helpers::str_field(peer, "display_name");
+            let addr = helpers::truncate_hex(helpers::str_field(peer, "ipv6_addr"), 10);
+            let conn = helpers::str_field(peer, "connectivity");
+            let depth = peer
+                .get("tree_depth")
+                .and_then(|v| v.as_u64())
+                .map(|n| n.to_string())
+                .unwrap_or_else(|| "-".into());
+            let srtt = helpers::nested_f64(peer, "mmp", "srtt_ms", 1);
+            let loss = helpers::nested_f64_prefer(peer, "mmp", "smoothed_loss", "loss_rate", 3);
+            let lqi = helpers::nested_f64(peer, "mmp", "lqi", 2);
+            let pkts_tx = helpers::nested_u64(peer, "stats", "packets_sent");
+            let pkts_rx = helpers::nested_u64(peer, "stats", "packets_recv");
+
+            Row::new(vec![
+                Cell::from(name.to_string()),
+                Cell::from(addr),
+                Cell::from(connectivity_styled(conn)),
+                Cell::from(depth),
+                Cell::from(srtt),
+                Cell::from(loss),
+                Cell::from(lqi),
+                Cell::from(pkts_tx),
+                Cell::from(pkts_rx),
+            ])
+        })
+        .collect();
+
+    let widths = [
+        Constraint::Min(12),
+        Constraint::Length(13),
+        Constraint::Length(8),
+        Constraint::Length(5),
+        Constraint::Length(8),
+        Constraint::Length(7),
+        Constraint::Length(6),
+        Constraint::Length(9),
+        Constraint::Length(9),
+    ];
+
+    let table = Table::new(rows, widths)
+        .header(header)
+        .block(
+            Block::default()
+                .borders(Borders::ALL)
+                .title(format!(" Peers ({}) ", row_count)),
+        )
+        .row_highlight_style(
+            Style::default()
+                .bg(Color::DarkGray)
+                .add_modifier(Modifier::BOLD),
+        )
+        .highlight_symbol("▶ ");
+
+    let state = app.table_states.entry(Tab::Peers).or_default();
+    frame.render_stateful_widget(table, area, state);
+
+    // Scrollbar
+    if row_count > 0 {
+        let selected = state.selected().unwrap_or(0);
+        let mut scrollbar_state = ScrollbarState::new(row_count).position(selected);
+        frame.render_stateful_widget(
+            Scrollbar::new(ScrollbarOrientation::VerticalRight)
+                .begin_symbol(None)
+                .end_symbol(None),
+            area,
+            &mut scrollbar_state,
+        );
+    }
+}
+
+fn draw_detail(frame: &mut Frame, app: &App, area: Rect, peers: &[serde_json::Value]) {
+    let state = app.table_states.get(&Tab::Peers);
+    let selected = state.and_then(|s| s.selected()).unwrap_or(0);
+
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" Peer Detail ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    let Some(peer) = peers.get(selected) else {
+        let msg = Paragraph::new("  No peer selected").style(Style::default().fg(Color::DarkGray));
+        frame.render_widget(msg, inner);
+        return;
+    };
+
+    let has_tree = peer.get("has_tree_position").and_then(|v| v.as_bool()).unwrap_or(false);
+    let has_bloom = peer.get("has_bloom_filter").and_then(|v| v.as_bool()).unwrap_or(false);
+
+    let mut lines: Vec<Line> = vec![
+        // Identity
+        helpers::section_header("Identity"),
+        helpers::kv_line("Name", helpers::str_field(peer, "display_name")),
+        helpers::kv_line("Node Addr", helpers::str_field(peer, "node_addr")),
+        helpers::kv_line("Npub", helpers::str_field(peer, "npub")),
+        helpers::kv_line("IPv6 Addr", helpers::str_field(peer, "ipv6_addr")),
+        Line::from(""),
+        // Connection
+        helpers::section_header("Connection"),
+        helpers::kv_line("Connectivity", helpers::str_field(peer, "connectivity")),
+        helpers::kv_line("Link ID", &helpers::u64_field(peer, "link_id")),
+    ];
+    if let Some(addr) = peer.get("transport_addr").and_then(|v| v.as_str()) {
+        lines.push(helpers::kv_line("Transport Addr", addr));
+    }
+    // Link details (cross-referenced)
+    let link_id = peer.get("link_id").and_then(|v| v.as_u64());
+    let link = lookup_link(app, link_id);
+    if let Some(ref link) = link {
+        lines.push(helpers::kv_line("Direction", helpers::str_field(link, "direction")));
+        lines.push(helpers::kv_line("Link State", helpers::str_field(link, "state")));
+    }
+    lines.extend([
+        helpers::kv_line("Authenticated", &helpers::format_elapsed_ms(
+            peer.get("authenticated_at_ms").and_then(|v| v.as_u64()).unwrap_or(0),
+        )),
+        helpers::kv_line("Last Seen", &helpers::format_elapsed_ms(
+            peer.get("last_seen_ms").and_then(|v| v.as_u64()).unwrap_or(0),
+        )),
+        Line::from(""),
+    ]);
+
+    // Transport info (cross-referenced from link → transport)
+    if let Some(transport) = link.as_ref().and_then(|l| lookup_transport(app, l)) {
+        lines.push(helpers::section_header("Transport"));
+        lines.push(helpers::kv_line("Type", helpers::str_field(&transport, "type")));
+        if let Some(name) = transport.get("name").and_then(|v| v.as_str()) {
+            lines.push(helpers::kv_line("Name", name));
+        }
+        lines.push(helpers::kv_line("MTU", &helpers::u64_field(&transport, "mtu")));
+        if let Some(addr) = transport.get("local_addr").and_then(|v| v.as_str()) {
+            lines.push(helpers::kv_line("Local Addr", addr));
+        }
+        lines.push(helpers::kv_line("State", helpers::str_field(&transport, "state")));
+        lines.push(Line::from(""));
+    }
+
+    lines.extend([
+        // Tree & Bloom
+        helpers::section_header("Tree / Bloom"),
+        helpers::kv_line("Tree Position", if has_tree { "yes" } else { "no" }),
+    ]);
+    if let Some(depth) = peer.get("tree_depth").and_then(|v| v.as_u64()) {
+        lines.push(helpers::kv_line("Tree Depth", &depth.to_string()));
+    }
+    lines.extend([
+        helpers::kv_line("Bloom Filter", if has_bloom { "yes" } else { "no" }),
+        helpers::kv_line("Filter Seq", &helpers::u64_field(peer, "filter_sequence")),
+        Line::from(""),
+        // Stats
+        helpers::section_header("Link Stats"),
+        helpers::kv_line("Pkts Sent", &helpers::nested_u64(peer, "stats", "packets_sent")),
+        helpers::kv_line("Pkts Recv", &helpers::nested_u64(peer, "stats", "packets_recv")),
+        helpers::kv_line("Bytes Sent", &helpers::format_bytes(
+            peer.get("stats").and_then(|s| s.get("bytes_sent")).and_then(|v| v.as_u64()).unwrap_or(0),
+        )),
+        helpers::kv_line("Bytes Recv", &helpers::format_bytes(
+            peer.get("stats").and_then(|s| s.get("bytes_recv")).and_then(|v| v.as_u64()).unwrap_or(0),
+        )),
+        Line::from(""),
+    ]);
+
+    // MMP (if present)
+    if peer.get("mmp").is_some() {
+        lines.push(helpers::section_header("MMP Metrics"));
+        lines.push(helpers::kv_line("Mode", &helpers::nested_str(peer, "mmp", "mode")));
+        lines.push(helpers::kv_line("SRTT", &format!("{}ms", helpers::nested_f64(peer, "mmp", "srtt_ms", 1))));
+        lines.push(helpers::kv_line("Loss Rate", &helpers::nested_f64_prefer(peer, "mmp", "smoothed_loss", "loss_rate", 4)));
+        lines.push(helpers::kv_line("ETX", &helpers::nested_f64_prefer(peer, "mmp", "smoothed_etx", "etx", 2)));
+        lines.push(helpers::kv_line("LQI", &helpers::nested_f64(peer, "mmp", "lqi", 2)));
+        lines.push(helpers::kv_line("Goodput", &helpers::nested_throughput(peer, "mmp", "goodput_bps")));
+        lines.push(helpers::kv_line("Delivery Fwd", &helpers::nested_f64(peer, "mmp", "delivery_ratio_forward", 3)));
+        lines.push(helpers::kv_line("Delivery Rev", &helpers::nested_f64(peer, "mmp", "delivery_ratio_reverse", 3)));
+    }
+
+    let detail_scroll = app.detail_view.as_ref().map(|d| d.scroll).unwrap_or(0);
+    let paragraph = Paragraph::new(lines).scroll((detail_scroll, 0));
+    frame.render_widget(paragraph, inner);
+}
+
+/// Look up the link for a peer by link_id.
+fn lookup_link(app: &App, link_id: Option<u64>) -> Option<serde_json::Value> {
+    let link_id = link_id?;
+    let links = app.data.get(&Tab::Links)?;
+    links
+        .get("links")?
+        .as_array()?
+        .iter()
+        .find(|l| l.get("link_id").and_then(|v| v.as_u64()) == Some(link_id))
+        .cloned()
+}
+
+/// Look up transport info by chaining: link → transport_id → transport.
+fn lookup_transport(app: &App, link: &serde_json::Value) -> Option<serde_json::Value> {
+    let transport_id = link.get("transport_id").and_then(|v| v.as_u64())?;
+    let transports = app.data.get(&Tab::Transports)?;
+    transports
+        .get("transports")?
+        .as_array()?
+        .iter()
+        .find(|t| t.get("transport_id").and_then(|v| v.as_u64()) == Some(transport_id))
+        .cloned()
+}
+
+fn connectivity_styled(conn: &str) -> Span<'static> {
+    let color = match conn {
+        "Full" => Color::Green,
+        "Partial" => Color::Yellow,
+        _ => Color::Red,
+    };
+    Span::styled(conn.to_string(), Style::default().fg(color))
+}
+

src/bin/fipstop/ui/routing.rs

@@ -0,0 +1,174 @@
+use ratatui::Frame;
+use ratatui::layout::{Constraint, Layout, Rect};
+use ratatui::style::{Color, Style};
+use ratatui::text::Line;
+use ratatui::widgets::{Block, Borders, Paragraph};
+
+use crate::app::{App, Tab};
+
+use super::helpers;
+
+pub fn draw(frame: &mut Frame, app: &App, area: Rect) {
+    let data = match app.data.get(&Tab::Routing) {
+        Some(d) => d,
+        None => {
+            let msg = Paragraph::new("  Waiting for data...")
+                .style(Style::default().fg(Color::DarkGray));
+            frame.render_widget(msg, area);
+            return;
+        }
+    };
+
+    let chunks = Layout::vertical([
+        Constraint::Length(7),  // Routing State
+        Constraint::Length(8),  // Coordinate Cache
+        Constraint::Min(3),    // Routing Statistics
+    ])
+    .split(area);
+
+    draw_routing_state(frame, data, chunks[0]);
+    draw_coord_cache(frame, app, chunks[1]);
+    draw_routing_stats(frame, data, chunks[2]);
+}
+
+fn draw_routing_state(frame: &mut Frame, data: &serde_json::Value, area: Rect) {
+    let lines = vec![
+        helpers::kv_line("Coord Cache", &helpers::u64_field(data, "coord_cache_entries")),
+        helpers::kv_line(
+            "Identity Cache",
+            &helpers::u64_field(data, "identity_cache_entries"),
+        ),
+        helpers::kv_line(
+            "Pending Lookups",
+            &helpers::u64_field(data, "pending_lookups"),
+        ),
+        helpers::kv_line(
+            "Recent Requests",
+            &helpers::u64_field(data, "recent_requests"),
+        ),
+    ];
+
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" Routing State ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+    frame.render_widget(Paragraph::new(lines), inner);
+}
+
+/// Format a forwarding counter as "N pkts (formatted_bytes)".
+fn fwd_line(data: &serde_json::Value, label: &str, pkt_key: &str, byte_key: &str) -> Line<'static> {
+    let pkts = data
+        .get("forwarding")
+        .and_then(|f| f.get(pkt_key))
+        .and_then(|v| v.as_u64())
+        .unwrap_or(0);
+    let bytes = data
+        .get("forwarding")
+        .and_then(|f| f.get(byte_key))
+        .and_then(|v| v.as_u64())
+        .unwrap_or(0);
+    helpers::kv_line(label, &format!("{} pkts ({})", pkts, helpers::format_bytes(bytes)))
+}
+
+fn draw_routing_stats(frame: &mut Frame, data: &serde_json::Value, area: Rect) {
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" Routing Statistics ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    let mut lines = vec![
+        helpers::section_header("Forwarding"),
+        fwd_line(data, "Received", "received_packets", "received_bytes"),
+        fwd_line(data, "Delivered", "delivered_packets", "delivered_bytes"),
+        fwd_line(data, "Forwarded", "forwarded_packets", "forwarded_bytes"),
+        fwd_line(data, "Originated", "originated_packets", "originated_bytes"),
+        fwd_line(data, "Decode Error", "decode_error_packets", "decode_error_bytes"),
+        fwd_line(data, "TTL Exhausted", "ttl_exhausted_packets", "ttl_exhausted_bytes"),
+        fwd_line(data, "No Route", "drop_no_route_packets", "drop_no_route_bytes"),
+        fwd_line(data, "MTU Exceeded", "drop_mtu_exceeded_packets", "drop_mtu_exceeded_bytes"),
+        fwd_line(data, "Send Error", "drop_send_error_packets", "drop_send_error_bytes"),
+        Line::from(""),
+        helpers::section_header("Discovery Requests"),
+        helpers::kv_line("Received", &helpers::nested_u64(data, "discovery", "req_received")),
+        helpers::kv_line("Forwarded", &helpers::nested_u64(data, "discovery", "req_forwarded")),
+        helpers::kv_line("Initiated", &helpers::nested_u64(data, "discovery", "req_initiated")),
+        helpers::kv_line("Deduplicated", &helpers::nested_u64(data, "discovery", "req_deduplicated")),
+        helpers::kv_line("Target Is Us", &helpers::nested_u64(data, "discovery", "req_target_is_us")),
+        helpers::kv_line("Duplicate", &helpers::nested_u64(data, "discovery", "req_duplicate")),
+        helpers::kv_line("Already Visited", &helpers::nested_u64(data, "discovery", "req_already_visited")),
+        helpers::kv_line("TTL Exhausted", &helpers::nested_u64(data, "discovery", "req_ttl_exhausted")),
+        helpers::kv_line("Decode Error", &helpers::nested_u64(data, "discovery", "req_decode_error")),
+        Line::from(""),
+        helpers::section_header("Discovery Responses"),
+        helpers::kv_line("Received", &helpers::nested_u64(data, "discovery", "resp_received")),
+        helpers::kv_line("Accepted", &helpers::nested_u64(data, "discovery", "resp_accepted")),
+        helpers::kv_line("Forwarded", &helpers::nested_u64(data, "discovery", "resp_forwarded")),
+        helpers::kv_line("Timed Out", &helpers::nested_u64(data, "discovery", "resp_timed_out")),
+        helpers::kv_line("Identity Miss", &helpers::nested_u64(data, "discovery", "resp_identity_miss")),
+        helpers::kv_line("Proof Failed", &helpers::nested_u64(data, "discovery", "resp_proof_failed")),
+        helpers::kv_line("Decode Error", &helpers::nested_u64(data, "discovery", "resp_decode_error")),
+        Line::from(""),
+        helpers::section_header("Error Signals"),
+        helpers::kv_line("Coords Required", &helpers::nested_u64(data, "error_signals", "coords_required")),
+        helpers::kv_line("Path Broken", &helpers::nested_u64(data, "error_signals", "path_broken")),
+        helpers::kv_line("MTU Exceeded", &helpers::nested_u64(data, "error_signals", "mtu_exceeded")),
+    ];
+
+    let max_lines = inner.height as usize;
+    lines.truncate(max_lines);
+
+    frame.render_widget(Paragraph::new(lines), inner);
+}
+
+fn draw_coord_cache(frame: &mut Frame, app: &App, area: Rect) {
+    let data = match app.data.get(&Tab::Cache) {
+        Some(d) => d,
+        None => {
+            let block = Block::default()
+                .borders(Borders::ALL)
+                .title(" Coordinate Cache ");
+            let inner = block.inner(area);
+            frame.render_widget(block, area);
+            let msg =
+                Paragraph::new("  Waiting for data...").style(Style::default().fg(Color::DarkGray));
+            frame.render_widget(msg, inner);
+            return;
+        }
+    };
+
+    let entries = helpers::u64_field(data, "entries");
+    let max_entries = helpers::u64_field(data, "max_entries");
+    let fill_pct = data
+        .get("fill_ratio")
+        .and_then(|v| v.as_f64())
+        .map(|r| format!("{:.1}%", r * 100.0))
+        .unwrap_or_else(|| "-".into());
+    let ttl = data
+        .get("default_ttl_ms")
+        .and_then(|v| v.as_u64())
+        .map(helpers::format_duration_ms)
+        .unwrap_or_else(|| "-".into());
+    let expired = helpers::u64_field(data, "expired");
+    let avg_age = data
+        .get("avg_age_ms")
+        .and_then(|v| v.as_u64())
+        .map(helpers::format_duration_ms)
+        .unwrap_or_else(|| "-".into());
+
+    let lines = vec![
+        helpers::kv_line("Entries", &format!("{entries} / {max_entries}")),
+        helpers::kv_line("Fill Ratio", &fill_pct),
+        helpers::kv_line("Default TTL", &ttl),
+        helpers::kv_line("Expired", &expired),
+        helpers::kv_line("Avg Age", &avg_age),
+    ];
+
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" Coordinate Cache ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+    frame.render_widget(Paragraph::new(lines), inner);
+}

src/bin/fipstop/ui/sessions.rs

@@ -0,0 +1,274 @@
+use ratatui::Frame;
+use ratatui::layout::{Constraint, Layout, Rect};
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{
+    Block, Borders, Cell, Paragraph, Row, Scrollbar, ScrollbarOrientation, ScrollbarState, Table,
+};
+
+use crate::app::{App, Tab};
+
+use super::helpers;
+
+pub fn draw(frame: &mut Frame, app: &mut App, area: Rect) {
+    let sessions = get_sessions(app);
+    let row_count = sessions.len();
+
+    if app.detail_view.is_some() {
+        let chunks = Layout::horizontal([
+            Constraint::Percentage(40),
+            Constraint::Percentage(60),
+        ])
+        .split(area);
+
+        draw_table(frame, app, chunks[0], &sessions, row_count);
+        draw_detail(frame, app, chunks[1], &sessions);
+    } else {
+        draw_table(frame, app, area, &sessions, row_count);
+    }
+}
+
+fn get_sessions(app: &App) -> Vec<serde_json::Value> {
+    app.data
+        .get(&Tab::Sessions)
+        .and_then(|v| v.get("sessions"))
+        .and_then(|v| v.as_array())
+        .cloned()
+        .unwrap_or_default()
+}
+
+fn draw_table(
+    frame: &mut Frame,
+    app: &mut App,
+    area: Rect,
+    sessions: &[serde_json::Value],
+    row_count: usize,
+) {
+    let header = Row::new(vec![
+        Cell::from("Name"),
+        Cell::from("Remote Addr"),
+        Cell::from("State"),
+        Cell::from("Role"),
+        Cell::from("SRTT"),
+        Cell::from("Loss"),
+        Cell::from("SQI"),
+        Cell::from("Path MTU"),
+        Cell::from("Last Activity"),
+    ])
+    .style(
+        Style::default()
+            .fg(Color::Yellow)
+            .add_modifier(Modifier::BOLD),
+    );
+
+    let rows: Vec<Row> = sessions
+        .iter()
+        .map(|session| {
+            let name = helpers::str_field(session, "display_name");
+            let addr = helpers::truncate_hex(helpers::str_field(session, "remote_addr"), 10);
+            let state = helpers::str_field(session, "state");
+            let role = session
+                .get("is_initiator")
+                .and_then(|v| v.as_bool())
+                .map(|b| if b { "init" } else { "resp" })
+                .unwrap_or("-");
+            let srtt = helpers::nested_f64(session, "mmp", "srtt_ms", 1);
+            let loss = helpers::nested_f64_prefer(session, "mmp", "smoothed_loss", "loss_rate", 3);
+            let sqi = helpers::nested_f64(session, "mmp", "sqi", 2);
+            let path_mtu = helpers::nested_u64(session, "mmp", "path_mtu");
+            let activity = helpers::format_elapsed_ms(
+                session
+                    .get("last_activity_ms")
+                    .and_then(|v| v.as_u64())
+                    .unwrap_or(0),
+            );
+
+            Row::new(vec![
+                Cell::from(name.to_string()),
+                Cell::from(addr),
+                Cell::from(state_styled(state)),
+                Cell::from(role.to_string()),
+                Cell::from(srtt),
+                Cell::from(loss),
+                Cell::from(sqi),
+                Cell::from(path_mtu),
+                Cell::from(activity),
+            ])
+        })
+        .collect();
+
+    let widths = [
+        Constraint::Min(12),
+        Constraint::Length(13),
+        Constraint::Length(13),
+        Constraint::Length(6),
+        Constraint::Length(8),
+        Constraint::Length(7),
+        Constraint::Length(6),
+        Constraint::Length(9),
+        Constraint::Length(14),
+    ];
+
+    let table = Table::new(rows, widths)
+        .header(header)
+        .block(
+            Block::default()
+                .borders(Borders::ALL)
+                .title(format!(" Sessions ({}) ", row_count)),
+        )
+        .row_highlight_style(
+            Style::default()
+                .bg(Color::DarkGray)
+                .add_modifier(Modifier::BOLD),
+        )
+        .highlight_symbol("▶ ");
+
+    let state = app.table_states.entry(Tab::Sessions).or_default();
+    frame.render_stateful_widget(table, area, state);
+
+    if row_count > 0 {
+        let selected = state.selected().unwrap_or(0);
+        let mut scrollbar_state = ScrollbarState::new(row_count).position(selected);
+        frame.render_stateful_widget(
+            Scrollbar::new(ScrollbarOrientation::VerticalRight)
+                .begin_symbol(None)
+                .end_symbol(None),
+            area,
+            &mut scrollbar_state,
+        );
+    }
+}
+
+fn draw_detail(frame: &mut Frame, app: &App, area: Rect, sessions: &[serde_json::Value]) {
+    let state = app.table_states.get(&Tab::Sessions);
+    let selected = state.and_then(|s| s.selected()).unwrap_or(0);
+
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" Session Detail ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    let Some(session) = sessions.get(selected) else {
+        let msg =
+            Paragraph::new("  No session selected").style(Style::default().fg(Color::DarkGray));
+        frame.render_widget(msg, inner);
+        return;
+    };
+
+    let role = session
+        .get("is_initiator")
+        .and_then(|v| v.as_bool())
+        .map(|b| if b { "Initiator" } else { "Responder" })
+        .unwrap_or("-");
+
+    let mut lines: Vec<Line> = vec![
+        helpers::section_header("Identity"),
+        helpers::kv_line("Name", helpers::str_field(session, "display_name")),
+        helpers::kv_line("Npub", helpers::str_field(session, "npub")),
+        helpers::kv_line("Remote Addr", helpers::str_field(session, "remote_addr")),
+        Line::from(""),
+        helpers::section_header("Session"),
+        helpers::kv_line("State", helpers::str_field(session, "state")),
+        helpers::kv_line("Role", role),
+        helpers::kv_line(
+            "Last Activity",
+            &helpers::format_elapsed_ms(
+                session
+                    .get("last_activity_ms")
+                    .and_then(|v| v.as_u64())
+                    .unwrap_or(0),
+            ),
+        ),
+        Line::from(""),
+    ];
+
+    // Traffic stats
+    lines.push(helpers::section_header("Traffic"));
+    lines.push(helpers::kv_line(
+        "Pkts Sent",
+        &helpers::nested_u64(session, "stats", "packets_sent"),
+    ));
+    lines.push(helpers::kv_line(
+        "Pkts Recv",
+        &helpers::nested_u64(session, "stats", "packets_recv"),
+    ));
+    lines.push(helpers::kv_line(
+        "Bytes Sent",
+        &helpers::format_bytes(
+            session
+                .get("stats")
+                .and_then(|s| s.get("bytes_sent"))
+                .and_then(|v| v.as_u64())
+                .unwrap_or(0),
+        ),
+    ));
+    lines.push(helpers::kv_line(
+        "Bytes Recv",
+        &helpers::format_bytes(
+            session
+                .get("stats")
+                .and_then(|s| s.get("bytes_recv"))
+                .and_then(|v| v.as_u64())
+                .unwrap_or(0),
+        ),
+    ));
+    lines.push(Line::from(""));
+
+    if session.get("mmp").is_some() {
+        lines.push(helpers::section_header("MMP Metrics"));
+        lines.push(helpers::kv_line(
+            "Mode",
+            &helpers::nested_str(session, "mmp", "mode"),
+        ));
+        lines.push(helpers::kv_line(
+            "SRTT",
+            &format!(
+                "{}ms",
+                helpers::nested_f64(session, "mmp", "srtt_ms", 1)
+            ),
+        ));
+        lines.push(helpers::kv_line(
+            "Loss Rate",
+            &helpers::nested_f64_prefer(session, "mmp", "smoothed_loss", "loss_rate", 4),
+        ));
+        lines.push(helpers::kv_line(
+            "ETX",
+            &helpers::nested_f64_prefer(session, "mmp", "smoothed_etx", "etx", 2),
+        ));
+        lines.push(helpers::kv_line(
+            "SQI",
+            &helpers::nested_f64(session, "mmp", "sqi", 2),
+        ));
+        lines.push(helpers::kv_line(
+            "Goodput",
+            &helpers::nested_throughput(session, "mmp", "goodput_bps"),
+        ));
+        lines.push(helpers::kv_line(
+            "Delivery Fwd",
+            &helpers::nested_f64(session, "mmp", "delivery_ratio_forward", 3),
+        ));
+        lines.push(helpers::kv_line(
+            "Delivery Rev",
+            &helpers::nested_f64(session, "mmp", "delivery_ratio_reverse", 3),
+        ));
+        lines.push(helpers::kv_line(
+            "Path MTU",
+            &helpers::nested_u64(session, "mmp", "path_mtu"),
+        ));
+    }
+
+    let detail_scroll = app.detail_view.as_ref().map(|d| d.scroll).unwrap_or(0);
+    let paragraph = Paragraph::new(lines).scroll((detail_scroll, 0));
+    frame.render_widget(paragraph, inner);
+}
+
+fn state_styled(state: &str) -> Span<'static> {
+    let color = match state {
+        "established" => Color::Green,
+        "initiating" | "awaiting_msg3" => Color::Yellow,
+        _ => Color::Red,
+    };
+    Span::styled(state.to_string(), Style::default().fg(color))
+}
+

src/bin/fipstop/ui/transports.rs

@@ -0,0 +1,605 @@
+use ratatui::Frame;
+use ratatui::layout::{Constraint, Layout, Rect};
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{
+    Block, Borders, Cell, Paragraph, Row, Scrollbar, ScrollbarOrientation, ScrollbarState, Table,
+};
+
+use crate::app::{App, SelectedTreeItem, Tab};
+
+use super::helpers;
+
+/// A single visible row in the tree view — either a transport or a nested link.
+enum TreeRow {
+    Transport {
+        index: usize,
+        transport_id: u64,
+        link_count: usize,
+    },
+    Link {
+        index: usize,
+        is_last: bool,
+    },
+}
+
+pub fn draw(frame: &mut Frame, app: &mut App, area: Rect) {
+    let transports = get_transports(app);
+    let links = get_links(app);
+    let tree_rows = build_tree_rows(&transports, &links, app);
+
+    // Update app state for navigation
+    app.tree_row_count = tree_rows.len();
+    update_selected_tree_item(app, &tree_rows);
+
+    if app.detail_view.is_some() {
+        let chunks = Layout::horizontal([
+            Constraint::Percentage(40),
+            Constraint::Percentage(60),
+        ])
+        .split(area);
+
+        draw_table(frame, app, chunks[0], &transports, &links, &tree_rows);
+        draw_detail(frame, app, chunks[1], &transports, &links, &tree_rows);
+    } else {
+        draw_table(frame, app, area, &transports, &links, &tree_rows);
+    }
+}
+
+fn get_transports(app: &App) -> Vec<serde_json::Value> {
+    app.data
+        .get(&Tab::Transports)
+        .and_then(|v| v.get("transports"))
+        .and_then(|v| v.as_array())
+        .cloned()
+        .unwrap_or_default()
+}
+
+fn get_links(app: &App) -> Vec<serde_json::Value> {
+    app.data
+        .get(&Tab::Links)
+        .and_then(|v| v.get("links"))
+        .and_then(|v| v.as_array())
+        .cloned()
+        .unwrap_or_default()
+}
+
+fn build_tree_rows(
+    transports: &[serde_json::Value],
+    links: &[serde_json::Value],
+    app: &App,
+) -> Vec<TreeRow> {
+    let mut rows = Vec::new();
+    for (t_idx, transport) in transports.iter().enumerate() {
+        let tid = transport
+            .get("transport_id")
+            .and_then(|v| v.as_u64())
+            .unwrap_or(0);
+
+        // Gather links belonging to this transport
+        let transport_links: Vec<(usize, &serde_json::Value)> = links
+            .iter()
+            .enumerate()
+            .filter(|(_, l)| l.get("transport_id").and_then(|v| v.as_u64()) == Some(tid))
+            .collect();
+
+        rows.push(TreeRow::Transport {
+            index: t_idx,
+            transport_id: tid,
+            link_count: transport_links.len(),
+        });
+
+        if app.expanded_transports.contains(&tid) {
+            let last_idx = transport_links.len().saturating_sub(1);
+            for (pos, (l_idx, _)) in transport_links.iter().enumerate() {
+                rows.push(TreeRow::Link {
+                    index: *l_idx,
+                    is_last: pos == last_idx,
+                });
+            }
+        }
+    }
+    rows
+}
+
+fn update_selected_tree_item(app: &mut App, tree_rows: &[TreeRow]) {
+    let selected = app
+        .table_states
+        .get(&Tab::Transports)
+        .and_then(|s| s.selected())
+        .unwrap_or(0);
+
+    app.selected_tree_item = match tree_rows.get(selected) {
+        Some(TreeRow::Transport { transport_id, .. }) => {
+            SelectedTreeItem::Transport(*transport_id)
+        }
+        Some(TreeRow::Link { .. }) => SelectedTreeItem::Link,
+        None => SelectedTreeItem::None,
+    };
+}
+
+fn draw_table(
+    frame: &mut Frame,
+    app: &mut App,
+    area: Rect,
+    transports: &[serde_json::Value],
+    links: &[serde_json::Value],
+    tree_rows: &[TreeRow],
+) {
+    let header = Row::new(vec![
+        Cell::from("Transport / Link"),
+        Cell::from("State"),
+        Cell::from("Peer"),
+        Cell::from("Tx"),
+        Cell::from("Rx"),
+    ])
+    .style(
+        Style::default()
+            .fg(Color::Yellow)
+            .add_modifier(Modifier::BOLD),
+    );
+
+    let rows: Vec<Row> = tree_rows
+        .iter()
+        .map(|tree_row| match tree_row {
+            TreeRow::Transport {
+                index,
+                transport_id,
+                link_count,
+            } => {
+                let t = &transports[*index];
+                let indicator = if *link_count == 0 {
+                    "  "
+                } else if app.expanded_transports.contains(transport_id) {
+                    "\u{25BC} " // ▼
+                } else {
+                    "\u{25B6} " // ▶
+                };
+                let typ = helpers::str_field(t, "type");
+                let name = t.get("name").and_then(|v| v.as_str()).unwrap_or("");
+                let addr = t.get("local_addr").and_then(|v| v.as_str()).unwrap_or("");
+                let label = if !name.is_empty() {
+                    format!("{indicator}{typ} {name}")
+                } else if !addr.is_empty() {
+                    format!("{indicator}{typ} {addr}")
+                } else {
+                    format!("{indicator}{typ} #{transport_id}")
+                };
+
+                let state = helpers::str_field(t, "state");
+                let tx = t
+                    .get("stats")
+                    .and_then(|s| s.get("packets_sent").or_else(|| s.get("frames_sent")))
+                    .and_then(|v| v.as_u64())
+                    .map(|n| n.to_string())
+                    .unwrap_or_else(|| "-".into());
+                let rx = t
+                    .get("stats")
+                    .and_then(|s| s.get("packets_recv").or_else(|| s.get("frames_recv")))
+                    .and_then(|v| v.as_u64())
+                    .map(|n| n.to_string())
+                    .unwrap_or_else(|| "-".into());
+
+                Row::new(vec![
+                    Cell::from(label),
+                    Cell::from(state.to_string()),
+                    Cell::from(""),
+                    Cell::from(tx),
+                    Cell::from(rx),
+                ])
+                .style(Style::default().fg(Color::White))
+            }
+            TreeRow::Link { index, is_last } => {
+                let link = &links[*index];
+                let tree_char = if *is_last { "\u{2514}\u{2500}" } else { "\u{251C}\u{2500}" }; // └─ or ├─
+                let dir = helpers::str_field(link, "direction");
+                let dir_short = match dir {
+                    "Outbound" => "Out",
+                    "Inbound" => "In",
+                    other => other,
+                };
+                let addr = helpers::truncate_hex(helpers::str_field(link, "remote_addr"), 16);
+                let label = format!("  {tree_char} {dir_short} {addr}");
+
+                let state = helpers::str_field(link, "state");
+                let peer_name = lookup_peer_for_link(app, link)
+                    .map(|p| helpers::str_field(&p, "display_name").to_string())
+                    .unwrap_or_default();
+
+                Row::new(vec![
+                    Cell::from(Span::styled(
+                        label,
+                        Style::default().fg(if dir == "Outbound" {
+                            Color::Cyan
+                        } else {
+                            Color::Green
+                        }),
+                    )),
+                    Cell::from(state.to_string()),
+                    Cell::from(peer_name),
+                    Cell::from(""),
+                    Cell::from(""),
+                ])
+            }
+        })
+        .collect();
+
+    let transport_count = transports.len();
+    let link_count: usize = tree_rows
+        .iter()
+        .filter(|r| matches!(r, TreeRow::Link { .. }))
+        .count();
+    let title = if link_count > 0 {
+        format!(" Transports ({transport_count}) Links ({link_count}) ")
+    } else {
+        format!(" Transports ({transport_count}) ")
+    };
+
+    let widths = [
+        Constraint::Min(28),
+        Constraint::Length(12),
+        Constraint::Length(14),
+        Constraint::Length(9),
+        Constraint::Length(9),
+    ];
+
+    let table = Table::new(rows, widths)
+        .header(header)
+        .block(Block::default().borders(Borders::ALL).title(title))
+        .row_highlight_style(
+            Style::default()
+                .bg(Color::DarkGray)
+                .add_modifier(Modifier::BOLD),
+        )
+        .highlight_symbol("\u{25B8} "); // ▸
+
+    let row_count = tree_rows.len();
+    let state = app.table_states.entry(Tab::Transports).or_default();
+    frame.render_stateful_widget(table, area, state);
+
+    if row_count > 0 {
+        let selected = state.selected().unwrap_or(0);
+        let mut scrollbar_state = ScrollbarState::new(row_count).position(selected);
+        frame.render_stateful_widget(
+            Scrollbar::new(ScrollbarOrientation::VerticalRight)
+                .begin_symbol(None)
+                .end_symbol(None),
+            area,
+            &mut scrollbar_state,
+        );
+    }
+}
+
+fn draw_detail(
+    frame: &mut Frame,
+    app: &App,
+    area: Rect,
+    transports: &[serde_json::Value],
+    links: &[serde_json::Value],
+    tree_rows: &[TreeRow],
+) {
+    let selected = app
+        .table_states
+        .get(&Tab::Transports)
+        .and_then(|s| s.selected())
+        .unwrap_or(0);
+
+    let Some(tree_row) = tree_rows.get(selected) else {
+        let block = Block::default()
+            .borders(Borders::ALL)
+            .title(" Detail ");
+        let inner = block.inner(area);
+        frame.render_widget(block, area);
+        let msg = Paragraph::new("  No item selected")
+            .style(Style::default().fg(Color::DarkGray));
+        frame.render_widget(msg, inner);
+        return;
+    };
+
+    match tree_row {
+        TreeRow::Transport { index, .. } => {
+            draw_transport_detail(frame, app, area, &transports[*index]);
+        }
+        TreeRow::Link { index, .. } => {
+            draw_link_detail(frame, app, area, &links[*index]);
+        }
+    }
+}
+
+fn draw_transport_detail(frame: &mut Frame, app: &App, area: Rect, t: &serde_json::Value) {
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" Transport Detail ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    let mut lines: Vec<Line> = vec![
+        helpers::section_header("Transport Info"),
+        helpers::kv_line("Transport ID", &helpers::u64_field(t, "transport_id")),
+        helpers::kv_line("Type", helpers::str_field(t, "type")),
+        helpers::kv_line("State", helpers::str_field(t, "state")),
+        helpers::kv_line("MTU", &helpers::u64_field(t, "mtu")),
+    ];
+
+    if let Some(name) = t.get("name").and_then(|v| v.as_str()) {
+        lines.push(helpers::kv_line("Name", name));
+    }
+    if let Some(addr) = t.get("local_addr").and_then(|v| v.as_str()) {
+        lines.push(helpers::kv_line("Local Addr", addr));
+    }
+
+    // Transport stats
+    if let Some(stats) = t.get("stats") {
+        let typ = helpers::str_field(t, "type");
+        lines.push(Line::from(""));
+        lines.push(helpers::section_header("Traffic"));
+
+        match typ {
+            "ethernet" => {
+                lines.push(helpers::kv_line(
+                    "Frames Sent",
+                    &helpers::nested_u64(t, "stats", "frames_sent"),
+                ));
+                lines.push(helpers::kv_line(
+                    "Frames Recv",
+                    &helpers::nested_u64(t, "stats", "frames_recv"),
+                ));
+            }
+            _ => {
+                lines.push(helpers::kv_line(
+                    "Pkts Sent",
+                    &helpers::nested_u64(t, "stats", "packets_sent"),
+                ));
+                lines.push(helpers::kv_line(
+                    "Pkts Recv",
+                    &helpers::nested_u64(t, "stats", "packets_recv"),
+                ));
+            }
+        }
+
+        let bytes_sent = stats
+            .get("bytes_sent")
+            .and_then(|v| v.as_u64())
+            .unwrap_or(0);
+        let bytes_recv = stats
+            .get("bytes_recv")
+            .and_then(|v| v.as_u64())
+            .unwrap_or(0);
+        lines.push(helpers::kv_line(
+            "Bytes Sent",
+            &helpers::format_bytes(bytes_sent),
+        ));
+        lines.push(helpers::kv_line(
+            "Bytes Recv",
+            &helpers::format_bytes(bytes_recv),
+        ));
+
+        lines.push(Line::from(""));
+        lines.push(helpers::section_header("Errors"));
+        lines.push(helpers::kv_line(
+            "Send Errors",
+            &helpers::nested_u64(t, "stats", "send_errors"),
+        ));
+        lines.push(helpers::kv_line(
+            "Recv Errors",
+            &helpers::nested_u64(t, "stats", "recv_errors"),
+        ));
+
+        match typ {
+            "udp" => {
+                lines.push(helpers::kv_line(
+                    "MTU Exceeded",
+                    &helpers::nested_u64(t, "stats", "mtu_exceeded"),
+                ));
+                lines.push(helpers::kv_line(
+                    "Kernel Drops",
+                    &helpers::nested_u64(t, "stats", "kernel_drops"),
+                ));
+            }
+            "tcp" => {
+                lines.push(helpers::kv_line(
+                    "MTU Exceeded",
+                    &helpers::nested_u64(t, "stats", "mtu_exceeded"),
+                ));
+                lines.push(Line::from(""));
+                lines.push(helpers::section_header("Connections"));
+                lines.push(helpers::kv_line(
+                    "Established",
+                    &helpers::nested_u64(t, "stats", "connections_established"),
+                ));
+                lines.push(helpers::kv_line(
+                    "Accepted",
+                    &helpers::nested_u64(t, "stats", "connections_accepted"),
+                ));
+                lines.push(helpers::kv_line(
+                    "Rejected",
+                    &helpers::nested_u64(t, "stats", "connections_rejected"),
+                ));
+                lines.push(helpers::kv_line(
+                    "Timeouts",
+                    &helpers::nested_u64(t, "stats", "connect_timeouts"),
+                ));
+                lines.push(helpers::kv_line(
+                    "Refused",
+                    &helpers::nested_u64(t, "stats", "connect_refused"),
+                ));
+            }
+            "ethernet" => {
+                lines.push(Line::from(""));
+                lines.push(helpers::section_header("Beacons"));
+                lines.push(helpers::kv_line(
+                    "Beacons Sent",
+                    &helpers::nested_u64(t, "stats", "beacons_sent"),
+                ));
+                lines.push(helpers::kv_line(
+                    "Beacons Recv",
+                    &helpers::nested_u64(t, "stats", "beacons_recv"),
+                ));
+                lines.push(Line::from(""));
+                lines.push(helpers::section_header("Frame Errors"));
+                lines.push(helpers::kv_line(
+                    "Too Short",
+                    &helpers::nested_u64(t, "stats", "frames_too_short"),
+                ));
+                lines.push(helpers::kv_line(
+                    "Too Long",
+                    &helpers::nested_u64(t, "stats", "frames_too_long"),
+                ));
+            }
+            _ => {}
+        }
+    }
+
+    let detail_scroll = app.detail_view.as_ref().map(|d| d.scroll).unwrap_or(0);
+    let paragraph = Paragraph::new(lines).scroll((detail_scroll, 0));
+    frame.render_widget(paragraph, inner);
+}
+
+fn draw_link_detail(frame: &mut Frame, app: &App, area: Rect, link: &serde_json::Value) {
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" Link Detail ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    let mut lines: Vec<Line> = vec![
+        helpers::section_header("Link Info"),
+        helpers::kv_line("Link ID", &helpers::u64_field(link, "link_id")),
+        helpers::kv_line("Direction", helpers::str_field(link, "direction")),
+        helpers::kv_line("State", helpers::str_field(link, "state")),
+        helpers::kv_line("Remote Addr", helpers::str_field(link, "remote_addr")),
+        helpers::kv_line(
+            "Created",
+            &helpers::format_elapsed_ms(
+                link.get("created_at_ms")
+                    .and_then(|v| v.as_u64())
+                    .unwrap_or(0),
+            ),
+        ),
+        Line::from(""),
+    ];
+
+    // Transport cross-reference
+    if let Some(transport) = lookup_transport(app, link) {
+        lines.push(helpers::section_header("Transport"));
+        lines.push(helpers::kv_line(
+            "Transport ID",
+            &helpers::u64_field(link, "transport_id"),
+        ));
+        lines.push(helpers::kv_line(
+            "Type",
+            helpers::str_field(&transport, "type"),
+        ));
+        if let Some(name) = transport.get("name").and_then(|v| v.as_str()) {
+            lines.push(helpers::kv_line("Name", name));
+        }
+        lines.push(helpers::kv_line(
+            "MTU",
+            &helpers::u64_field(&transport, "mtu"),
+        ));
+        if let Some(addr) = transport.get("local_addr").and_then(|v| v.as_str()) {
+            lines.push(helpers::kv_line("Local Addr", addr));
+        }
+        lines.push(helpers::kv_line(
+            "State",
+            helpers::str_field(&transport, "state"),
+        ));
+        lines.push(Line::from(""));
+    }
+
+    // Peer cross-reference
+    if let Some(peer) = lookup_peer_for_link(app, link) {
+        lines.push(helpers::section_header("Peer"));
+        lines.push(helpers::kv_line(
+            "Name",
+            helpers::str_field(&peer, "display_name"),
+        ));
+        lines.push(helpers::kv_line(
+            "Connectivity",
+            helpers::str_field(&peer, "connectivity"),
+        ));
+        lines.push(helpers::kv_line(
+            "Last Seen",
+            &helpers::format_elapsed_ms(
+                peer.get("last_seen_ms")
+                    .and_then(|v| v.as_u64())
+                    .unwrap_or(0),
+            ),
+        ));
+        lines.push(Line::from(""));
+        lines.push(helpers::section_header("Peer Stats"));
+        lines.push(helpers::kv_line(
+            "Pkts Sent",
+            &helpers::nested_u64(&peer, "stats", "packets_sent"),
+        ));
+        lines.push(helpers::kv_line(
+            "Pkts Recv",
+            &helpers::nested_u64(&peer, "stats", "packets_recv"),
+        ));
+        lines.push(helpers::kv_line(
+            "Bytes Sent",
+            &helpers::format_bytes(
+                peer.get("stats")
+                    .and_then(|s| s.get("bytes_sent"))
+                    .and_then(|v| v.as_u64())
+                    .unwrap_or(0),
+            ),
+        ));
+        lines.push(helpers::kv_line(
+            "Bytes Recv",
+            &helpers::format_bytes(
+                peer.get("stats")
+                    .and_then(|s| s.get("bytes_recv"))
+                    .and_then(|v| v.as_u64())
+                    .unwrap_or(0),
+            ),
+        ));
+        if peer.get("mmp").is_some() {
+            lines.push(Line::from(""));
+            lines.push(helpers::section_header("MMP Metrics"));
+            lines.push(helpers::kv_line(
+                "SRTT",
+                &format!("{}ms", helpers::nested_f64(&peer, "mmp", "srtt_ms", 1)),
+            ));
+            lines.push(helpers::kv_line(
+                "Loss Rate",
+                &helpers::nested_f64_prefer(&peer, "mmp", "smoothed_loss", "loss_rate", 4),
+            ));
+            lines.push(helpers::kv_line(
+                "ETX",
+                &helpers::nested_f64_prefer(&peer, "mmp", "smoothed_etx", "etx", 2),
+            ));
+            lines.push(helpers::kv_line(
+                "LQI",
+                &helpers::nested_f64(&peer, "mmp", "lqi", 2),
+            ));
+        }
+    }
+
+    let detail_scroll = app.detail_view.as_ref().map(|d| d.scroll).unwrap_or(0);
+    let paragraph = Paragraph::new(lines).scroll((detail_scroll, 0));
+    frame.render_widget(paragraph, inner);
+}
+
+/// Look up the peer associated with a link by matching link_id.
+fn lookup_peer_for_link(app: &App, link: &serde_json::Value) -> Option<serde_json::Value> {
+    let link_id = link.get("link_id").and_then(|v| v.as_u64())?;
+    let peers = app.data.get(&Tab::Peers)?;
+    peers
+        .get("peers")?
+        .as_array()?
+        .iter()
+        .find(|p| p.get("link_id").and_then(|v| v.as_u64()) == Some(link_id))
+        .cloned()
+}
+
+fn lookup_transport(app: &App, link: &serde_json::Value) -> Option<serde_json::Value> {
+    let transport_id = link.get("transport_id").and_then(|v| v.as_u64())?;
+    let transports = app.data.get(&Tab::Transports)?;
+    transports
+        .get("transports")?
+        .as_array()?
+        .iter()
+        .find(|t| t.get("transport_id").and_then(|v| v.as_u64()) == Some(transport_id))
+        .cloned()
+}

src/bin/fipstop/ui/tree.rs

@@ -0,0 +1,213 @@
+use ratatui::Frame;
+use ratatui::layout::{Constraint, Layout, Rect};
+use ratatui::style::{Color, Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Block, Borders, Paragraph};
+
+use crate::app::{App, Tab};
+
+use super::helpers;
+
+pub fn draw(frame: &mut Frame, app: &App, area: Rect) {
+    let data = match app.data.get(&Tab::Tree) {
+        Some(d) => d,
+        None => {
+            let msg = Paragraph::new("  Waiting for data...")
+                .style(Style::default().fg(Color::DarkGray));
+            frame.render_widget(msg, area);
+            return;
+        }
+    };
+
+    let chunks = Layout::vertical([
+        Constraint::Length(10), // Tree Position
+        Constraint::Length(22), // Tree Announce Stats
+        Constraint::Min(3),    // Tree Peers
+    ])
+    .split(area);
+
+    draw_position(frame, data, chunks[0]);
+    draw_stats(frame, data, chunks[1]);
+    draw_peers(frame, data, chunks[2]);
+}
+
+fn draw_position(frame: &mut Frame, data: &serde_json::Value, area: Rect) {
+    let root_hex = helpers::str_field(data, "root");
+    let is_root = data
+        .get("is_root")
+        .and_then(|v| v.as_bool())
+        .unwrap_or(false);
+    let depth = helpers::u64_field(data, "depth");
+    let parent_name = helpers::str_field(data, "parent_display_name");
+    let decl_seq = helpers::u64_field(data, "declaration_sequence");
+    let decl_signed = helpers::bool_field(data, "declaration_signed");
+
+    let root_display = if is_root {
+        format!("{} (self)", helpers::truncate_hex(root_hex, 16))
+    } else {
+        helpers::truncate_hex(root_hex, 16)
+    };
+
+    let parent_display = if is_root {
+        "self (root)".to_string()
+    } else {
+        parent_name.to_string()
+    };
+
+    let mut lines = vec![
+        helpers::kv_line("Root", &root_display),
+        helpers::kv_line("Depth", &depth),
+        helpers::kv_line("Parent", &parent_display),
+        helpers::kv_line("Declaration", &format!("seq {decl_seq}, {decl_signed}")),
+        Line::from(""),
+    ];
+
+    // Coordinate path: my_coords array is self→root, render root→self
+    if let Some(coords) = data.get("my_coords").and_then(|v| v.as_array()) {
+        let mut path_parts: Vec<Span> = vec![Span::styled(
+            "    Path: ",
+            Style::default().fg(Color::DarkGray),
+        )];
+
+        if coords.is_empty() {
+            path_parts.push(Span::styled(
+                "[root]",
+                Style::default().fg(Color::Yellow),
+            ));
+        } else {
+            // Reverse: root first, self last
+            for (i, entry) in coords.iter().rev().enumerate() {
+                if i > 0 {
+                    path_parts
+                        .push(Span::styled(" > ", Style::default().fg(Color::DarkGray)));
+                }
+                let hex = entry.as_str().unwrap_or("-");
+                let color = if i == 0 {
+                    Color::Yellow // root
+                } else {
+                    Color::White
+                };
+                path_parts
+                    .push(Span::styled(helpers::truncate_hex(hex, 8), Style::default().fg(color)));
+            }
+            path_parts.push(Span::styled(" > ", Style::default().fg(Color::DarkGray)));
+            path_parts.push(Span::styled(
+                "[self]",
+                Style::default()
+                    .fg(Color::Green)
+                    .add_modifier(Modifier::BOLD),
+            ));
+        }
+
+        lines.push(Line::from(path_parts));
+    }
+
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" Tree Position ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+    frame.render_widget(Paragraph::new(lines), inner);
+}
+
+fn draw_stats(frame: &mut Frame, data: &serde_json::Value, area: Rect) {
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(" Tree Announce Stats ");
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    let mut lines = vec![
+        helpers::section_header("Inbound"),
+        helpers::kv_line("Received", &helpers::nested_u64(data, "stats", "received")),
+        helpers::kv_line("Accepted", &helpers::nested_u64(data, "stats", "accepted")),
+        helpers::kv_line("Decode Error", &helpers::nested_u64(data, "stats", "decode_error")),
+        helpers::kv_line("Unknown Peer", &helpers::nested_u64(data, "stats", "unknown_peer")),
+        helpers::kv_line("Addr Mismatch", &helpers::nested_u64(data, "stats", "addr_mismatch")),
+        helpers::kv_line("Sig Failed", &helpers::nested_u64(data, "stats", "sig_failed")),
+        helpers::kv_line("Stale", &helpers::nested_u64(data, "stats", "stale")),
+        helpers::kv_line("Parent Switched", &helpers::nested_u64(data, "stats", "parent_switched")),
+        helpers::kv_line("Loop Detected", &helpers::nested_u64(data, "stats", "loop_detected")),
+        helpers::kv_line("Ancestry Changed", &helpers::nested_u64(data, "stats", "ancestry_changed")),
+        Line::from(""),
+        helpers::section_header("Outbound"),
+        helpers::kv_line("Sent", &helpers::nested_u64(data, "stats", "sent")),
+        helpers::kv_line("Rate Limited", &helpers::nested_u64(data, "stats", "rate_limited")),
+        helpers::kv_line("Send Failed", &helpers::nested_u64(data, "stats", "send_failed")),
+        Line::from(""),
+        helpers::section_header("Cumulative"),
+        helpers::kv_line("Parent Switches", &helpers::nested_u64(data, "stats", "parent_switches")),
+        helpers::kv_line("Parent Losses", &helpers::nested_u64(data, "stats", "parent_losses")),
+        helpers::kv_line("Flap Dampened", &helpers::nested_u64(data, "stats", "flap_dampened")),
+    ];
+
+    // Trim to fit available height
+    let max_lines = inner.height as usize;
+    lines.truncate(max_lines);
+
+    frame.render_widget(Paragraph::new(lines), inner);
+}
+
+fn draw_peers(frame: &mut Frame, data: &serde_json::Value, area: Rect) {
+    let peers = data
+        .get("peers")
+        .and_then(|v| v.as_array())
+        .cloned()
+        .unwrap_or_default();
+    let my_root = helpers::str_field(data, "root");
+
+    let count = peers.len();
+    let block = Block::default()
+        .borders(Borders::ALL)
+        .title(format!(" Tree Peers ({count}) "));
+    let inner = block.inner(area);
+    frame.render_widget(block, area);
+
+    if peers.is_empty() {
+        let msg =
+            Paragraph::new("  No peers").style(Style::default().fg(Color::DarkGray));
+        frame.render_widget(msg, inner);
+        return;
+    }
+
+    let lines: Vec<Line> = peers
+        .iter()
+        .map(|p| {
+            let name = helpers::str_field(p, "display_name");
+            let has_depth = p.get("depth").is_some();
+
+            if !has_depth {
+                return Line::from(vec![
+                    Span::styled(
+                        format!("    {name:<16}"),
+                        Style::default().fg(Color::DarkGray),
+                    ),
+                    Span::styled("(no position)", Style::default().fg(Color::DarkGray)),
+                ]);
+            }
+
+            let depth = helpers::u64_field(p, "depth");
+            let dist = helpers::u64_field(p, "distance_to_us");
+            let peer_root = helpers::str_field(p, "root");
+            let (root_ind, root_color) = if peer_root == my_root {
+                ("same root", Color::Green)
+            } else {
+                ("diff root", Color::Red)
+            };
+
+            Line::from(vec![
+                Span::styled(
+                    format!("    {name:<16}"),
+                    Style::default().add_modifier(Modifier::BOLD),
+                ),
+                Span::styled("depth: ", Style::default().fg(Color::DarkGray)),
+                Span::raw(format!("{depth:<4}")),
+                Span::styled("dist: ", Style::default().fg(Color::DarkGray)),
+                Span::raw(format!("{dist:<4}")),
+                Span::styled(root_ind, Style::default().fg(root_color)),
+            ])
+        })
+        .collect();
+
+    frame.render_widget(Paragraph::new(lines), inner);
+}

src/config/node.rs

@@ -375,7 +375,9 @@ impl ControlConfig {
 
     fn default_socket_path() -> String {
         if let Ok(runtime_dir) = std::env::var("XDG_RUNTIME_DIR") {
-            format!("{}/fips/control.sock", runtime_dir)
+            format!("{runtime_dir}/fips/control.sock")
+        } else if std::fs::create_dir_all("/run/fips").is_ok() {
+            "/run/fips/control.sock".to_string()
         } else {
             "/tmp/fips-control.sock".to_string()
         }

src/control/queries.rs

@@ -3,6 +3,7 @@
 //! Each function takes `&Node` and returns a `serde_json::Value`.
 //! Query logic is kept separate from socket handling.
 
+use crate::identity::encode_npub;
 use crate::node::Node;
 use serde_json::{json, Value};
 
@@ -31,10 +32,17 @@ fn trend_label(short: f64, long: f64) -> &'static str {
 
 /// `show_status` — Node overview.
 pub fn show_status(node: &Node) -> Value {
+    let pid = std::process::id();
+    let exe_path = std::env::current_exe()
+        .map(|p| p.display().to_string())
+        .unwrap_or_else(|_| "-".into());
+    let uptime_secs = node.uptime().as_secs();
+    let fwd = node.stats().snapshot().forwarding;
+
     json!({
         "npub": node.npub(),
         "node_addr": hex::encode(node.node_addr().as_bytes()),
-        "fips_address": format!("{}", node.identity().address()),
+        "ipv6_addr": format!("{}", node.identity().address()),
         "state": format!("{}", node.state()),
         "is_leaf_only": node.is_leaf_only(),
         "peer_count": node.peer_count(),
@@ -43,7 +51,13 @@ pub fn show_status(node: &Node) -> Value {
         "transport_count": node.transport_count(),
         "connection_count": node.connection_count(),
         "tun_state": format!("{}", node.tun_state()),
+        "tun_name": node.tun_name().unwrap_or("-"),
         "effective_ipv6_mtu": node.effective_ipv6_mtu(),
+        "control_socket": &node.config().node.control.socket_path,
+        "pid": pid,
+        "exe_path": exe_path,
+        "uptime_secs": uptime_secs,
+        "forwarding": serde_json::to_value(&fwd).unwrap_or_default(),
     })
 }
 
@@ -57,7 +71,7 @@ pub fn show_peers(node: &Node) -> Value {
             "node_addr": addr_hex,
             "npub": peer.npub(),
             "display_name": node.peer_display_name(&node_addr),
-            "fips_address": format!("{}", peer.address()),
+            "ipv6_addr": format!("{}", peer.address()),
             "connectivity": format!("{}", peer.connectivity()),
             "link_id": peer.link_id().as_u64(),
             "authenticated_at_ms": peer.authenticated_at(),
@@ -99,6 +113,17 @@ pub fn show_peers(node: &Node) -> Value {
             mmp_json["goodput_bps"] = json!(mmp.metrics.goodput_bps);
             mmp_json["delivery_ratio_forward"] = json!(mmp.metrics.delivery_ratio_forward);
             mmp_json["delivery_ratio_reverse"] = json!(mmp.metrics.delivery_ratio_reverse);
+            if let Some(smoothed_loss) = mmp.metrics.smoothed_loss() {
+                mmp_json["smoothed_loss"] = json!(smoothed_loss);
+            }
+            if let Some(smoothed_etx) = mmp.metrics.smoothed_etx() {
+                mmp_json["smoothed_etx"] = json!(smoothed_etx);
+            }
+            if let Some(srtt) = mmp.metrics.srtt_ms() {
+                if let Some(setx) = mmp.metrics.smoothed_etx() {
+                    mmp_json["lqi"] = json!(setx * (1.0 + srtt / 100.0));
+                }
+            }
             peer_json["mmp"] = mmp_json;
         }
 
@@ -207,15 +232,44 @@ pub fn show_sessions(node: &Node) -> Value {
             "last_activity_ms": entry.last_activity(),
         });
 
+        // Derive npub from session's remote public key
+        let (xonly, _parity) = entry.remote_pubkey().x_only_public_key();
+        session_json["npub"] = json!(encode_npub(&xonly));
+
+        // Traffic counters
+        let (pkts_tx, pkts_rx, bytes_tx, bytes_rx) = entry.traffic_counters();
+        session_json["stats"] = json!({
+            "packets_sent": pkts_tx,
+            "packets_recv": pkts_rx,
+            "bytes_sent": bytes_tx,
+            "bytes_recv": bytes_rx,
+        });
+
         // Add session MMP if available
         if let Some(mmp) = entry.mmp() {
             let mut mmp_json = json!({
                 "mode": format!("{}", mmp.mode()),
+                "loss_rate": mmp.metrics.loss_rate(),
+                "etx": mmp.metrics.etx,
+                "goodput_bps": mmp.metrics.goodput_bps,
+                "delivery_ratio_forward": mmp.metrics.delivery_ratio_forward,
+                "delivery_ratio_reverse": mmp.metrics.delivery_ratio_reverse,
+                "path_mtu": mmp.path_mtu.current_mtu(),
             });
             if let Some(srtt) = mmp.metrics.srtt_ms() {
                 mmp_json["srtt_ms"] = json!(srtt);
             }
-            mmp_json["path_mtu"] = json!(mmp.path_mtu.current_mtu());
+            if let Some(smoothed_loss) = mmp.metrics.smoothed_loss() {
+                mmp_json["smoothed_loss"] = json!(smoothed_loss);
+            }
+            if let Some(smoothed_etx) = mmp.metrics.smoothed_etx() {
+                mmp_json["smoothed_etx"] = json!(smoothed_etx);
+            }
+            if let Some(srtt) = mmp.metrics.srtt_ms() {
+                if let Some(setx) = mmp.metrics.smoothed_etx() {
+                    mmp_json["sqi"] = json!(setx * (1.0 + srtt / 100.0));
+                }
+            }
             session_json["mmp"] = mmp_json;
         }
 
@@ -279,8 +333,17 @@ pub fn show_mmp(node: &Node) -> Value {
             "spin_bit_role": if mmp.spin_bit.is_initiator() { "initiator" } else { "responder" },
         });
 
+        if let Some(smoothed_loss) = metrics.smoothed_loss() {
+            link_layer["smoothed_loss"] = json!(smoothed_loss);
+        }
+        if let Some(smoothed_etx) = metrics.smoothed_etx() {
+            link_layer["smoothed_etx"] = json!(smoothed_etx);
+        }
         if let Some(srtt) = metrics.srtt_ms() {
             link_layer["srtt_ms"] = json!(srtt);
+            if let Some(setx) = metrics.smoothed_etx() {
+                link_layer["lqi"] = json!(setx * (1.0 + srtt / 100.0));
+            }
         }
 
         // Trend indicators
@@ -319,8 +382,17 @@ pub fn show_mmp(node: &Node) -> Value {
             "path_mtu": mmp.path_mtu.current_mtu(),
         });
 
+        if let Some(smoothed_loss) = metrics.smoothed_loss() {
+            session_layer["smoothed_loss"] = json!(smoothed_loss);
+        }
+        if let Some(smoothed_etx) = metrics.smoothed_etx() {
+            session_layer["smoothed_etx"] = json!(smoothed_etx);
+        }
         if let Some(srtt) = metrics.srtt_ms() {
             session_layer["srtt_ms"] = json!(srtt);
+            if let Some(setx) = metrics.smoothed_etx() {
+                session_layer["sqi"] = json!(setx * (1.0 + srtt / 100.0));
+            }
         }
 
         Some(json!({

src/mmp/metrics.rs

@@ -24,6 +24,7 @@ pub struct MmpMetrics {
     pub loss_trend: DualEwma,
     pub goodput_trend: DualEwma,
     pub jitter_trend: DualEwma,
+    pub etx_trend: DualEwma,
 
     /// Forward delivery ratio (what fraction of our frames the peer received).
     pub delivery_ratio_forward: f64,
@@ -54,6 +55,7 @@ impl MmpMetrics {
             loss_trend: DualEwma::new(),
             goodput_trend: DualEwma::new(),
             jitter_trend: DualEwma::new(),
+            etx_trend: DualEwma::new(),
             delivery_ratio_forward: 1.0,
             delivery_ratio_reverse: 1.0,
             etx: 1.0,
@@ -106,6 +108,7 @@ impl MmpMetrics {
                 let loss_rate = 1.0 - self.delivery_ratio_forward;
                 self.loss_trend.update(loss_rate);
                 self.etx = compute_etx(self.delivery_ratio_forward, self.delivery_ratio_reverse);
+                self.etx_trend.update(self.etx);
             }
         }
 
@@ -146,6 +149,7 @@ impl MmpMetrics {
     pub fn set_delivery_ratio_reverse(&mut self, ratio: f64) {
         self.delivery_ratio_reverse = ratio.clamp(0.0, 1.0);
         self.etx = compute_etx(self.delivery_ratio_forward, self.delivery_ratio_reverse);
+        self.etx_trend.update(self.etx);
     }
 
     /// Current smoothed RTT in milliseconds, or `None` if not yet measured.
@@ -162,6 +166,24 @@ impl MmpMetrics {
         1.0 - self.delivery_ratio_forward
     }
 
+    /// Smoothed loss rate (long-term EWMA), or `None` if not yet initialized.
+    pub fn smoothed_loss(&self) -> Option<f64> {
+        if self.loss_trend.initialized() {
+            Some(self.loss_trend.long())
+        } else {
+            None
+        }
+    }
+
+    /// Smoothed ETX (long-term EWMA), or `None` if not yet initialized.
+    pub fn smoothed_etx(&self) -> Option<f64> {
+        if self.etx_trend.initialized() {
+            Some(self.etx_trend.long())
+        } else {
+            None
+        }
+    }
+
     /// Current smoothed goodput in bytes/sec, or 0 if not yet measured.
     pub fn goodput_bps(&self) -> f64 {
         self.goodput_bps

src/node/handlers/session.rs

@@ -263,11 +263,12 @@ impl Node {
             }
         }
 
-        // Only application data resets the idle timer — MMP reports
-        // (SenderReport, ReceiverReport, PathMtuNotification) do not.
+        // Only application data resets the idle timer and traffic counters —
+        // MMP reports (SenderReport, ReceiverReport, PathMtuNotification) do not.
         if msg_type == SessionMessageType::DataPacket.to_byte()
             && let Some(entry) = self.sessions.get_mut(src_addr)
         {
+            entry.record_recv(rest.len());
             entry.touch(Self::now_ms());
         }
 
@@ -1026,6 +1027,7 @@ impl Node {
 
         // Re-borrow after send (which borrowed &mut self)
         if let Some(entry) = self.sessions.get_mut(dest_addr) {
+            entry.record_sent(plaintext.len());
             if let Some(mmp) = entry.mmp_mut() {
                 mmp.sender.record_sent(counter, timestamp, ciphertext.len());
             }

src/node/mod.rs

@@ -216,6 +216,9 @@ pub struct Node {
     /// Exchanged inside Noise handshake messages so peers can detect restarts.
     startup_epoch: [u8; 8],
 
+    /// Instant when the node was created, for uptime reporting.
+    started_at: std::time::Instant,
+
     // === Configuration ===
     /// Loaded configuration.
     config: Config,
@@ -415,6 +418,7 @@ impl Node {
         Ok(Self {
             identity,
             startup_epoch,
+            started_at: std::time::Instant::now(),
             config,
             state: NodeState::Created,
             is_leaf_only,
@@ -509,6 +513,7 @@ impl Node {
         Self {
             identity,
             startup_epoch,
+            started_at: std::time::Instant::now(),
             config,
             state: NodeState::Created,
             is_leaf_only: false,
@@ -764,6 +769,11 @@ impl Node {
         self.state
     }
 
+    /// Get the node uptime.
+    pub fn uptime(&self) -> std::time::Duration {
+        self.started_at.elapsed()
+    }
+
     /// Check if node is operational.
     pub fn is_running(&self) -> bool {
         self.state.is_operational()
@@ -829,6 +839,11 @@ impl Node {
         self.tun_state
     }
 
+    /// Get the TUN interface name, if active.
+    pub fn tun_name(&self) -> Option<&str> {
+        self.tun_name.as_deref()
+    }
+
 
     // === Resource Limits ===
 

src/node/session.rs

@@ -73,6 +73,16 @@ pub(crate) struct SessionEntry {
     /// Session-layer MMP state. Initialized on Established transition.
     mmp: Option<MmpSessionState>,
 
+    // === Traffic Counters ===
+    /// Total data packets sent on this session.
+    packets_sent: u64,
+    /// Total data packets received on this session.
+    packets_recv: u64,
+    /// Total data bytes sent on this session (FSP payload).
+    bytes_sent: u64,
+    /// Total data bytes received on this session (FSP payload).
+    bytes_recv: u64,
+
     // === Handshake Resend ===
     /// Encoded session-layer payload for resend (SessionSetup or SessionAck).
     /// Cleared on Established transition.
@@ -102,6 +112,10 @@ impl SessionEntry {
             coords_warmup_remaining: 0,
             is_initiator,
             mmp: None,
+            packets_sent: 0,
+            packets_recv: 0,
+            bytes_sent: 0,
+            bytes_recv: 0,
             handshake_payload: None,
             resend_count: 0,
             next_resend_at_ms: 0,
@@ -219,6 +233,25 @@ impl SessionEntry {
         self.mmp = Some(MmpSessionState::new(config, self.is_initiator));
     }
 
+    // === Traffic Counters ===
+
+    /// Record a sent data packet.
+    pub(crate) fn record_sent(&mut self, bytes: usize) {
+        self.packets_sent += 1;
+        self.bytes_sent += bytes as u64;
+    }
+
+    /// Record a received data packet.
+    pub(crate) fn record_recv(&mut self, bytes: usize) {
+        self.packets_recv += 1;
+        self.bytes_recv += bytes as u64;
+    }
+
+    /// Get traffic counters: (packets_sent, packets_recv, bytes_sent, bytes_recv).
+    pub(crate) fn traffic_counters(&self) -> (u64, u64, u64, u64) {
+        (self.packets_sent, self.packets_recv, self.bytes_sent, self.bytes_recv)
+    }
+
     // === Handshake Resend ===
 
     /// Store the encoded session-layer payload for potential resend.

testing/chaos/sim/control.py

@@ -16,9 +16,9 @@ from .topology import SimTopology
 
 log = logging.getLogger(__name__)
 
-# Default control socket path inside containers (XDG_RUNTIME_DIR is
-# typically unset in Docker, so fips falls back to /tmp).
-CONTROL_SOCKET = "/tmp/fips-control.sock"
+# Default control socket path inside containers (running as root,
+# so /run/fips/ is created by the daemon).
+CONTROL_SOCKET = "/run/fips/control.sock"
 
 
 def query_node(container: str, command: str, timeout: int = 10) -> dict | None:

testing/sidecar/.gitignore

@@ -1,2 +1,3 @@
 fips
 fipsctl
+fipstop

testing/sidecar/Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:bookworm-slim
+FROM debian:trixie-slim
 
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
@@ -25,8 +25,8 @@ RUN printf '%s\n' \
     'no-resolv' \
     >> /etc/dnsmasq.conf
 
-COPY fips fipsctl /usr/local/bin/
-RUN chmod +x /usr/local/bin/fips /usr/local/bin/fipsctl
+COPY fips fipsctl fipstop /usr/local/bin/
+RUN chmod +x /usr/local/bin/fips /usr/local/bin/fipsctl /usr/local/bin/fipstop
 
 COPY entrypoint.sh /entrypoint.sh
 

testing/sidecar/Dockerfile.app

@@ -1,4 +1,4 @@
-FROM debian:bookworm-slim
+FROM debian:trixie-slim
 
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \

testing/sidecar/docker-compose.yml

@@ -26,6 +26,7 @@ services:
       - FIPS_PEER_ALIAS=${FIPS_PEER_ALIAS:-peer}
       - FIPS_UDP_BIND=${FIPS_UDP_BIND:-0.0.0.0:2121}
       - FIPS_TUN_MTU=${FIPS_TUN_MTU:-1280}
+      - FIPS_PEER_TRANSPORT=${FIPS_PEER_TRANSPORT:-udp}
     volumes:
       - ./resolv.conf:/etc/resolv.conf:ro
     networks:

testing/sidecar/entrypoint.sh

@@ -7,6 +7,7 @@ set -e
 FIPS_NSEC="${FIPS_NSEC:?FIPS_NSEC is required}"
 FIPS_UDP_BIND="${FIPS_UDP_BIND:-0.0.0.0:2121}"
 FIPS_TUN_MTU="${FIPS_TUN_MTU:-1280}"
+FIPS_PEER_TRANSPORT="${FIPS_PEER_TRANSPORT:-udp}"
 
 mkdir -p /etc/fips
 
@@ -17,7 +18,7 @@ if [ -n "$FIPS_PEER_NPUB" ] && [ -n "$FIPS_PEER_ADDR" ]; then
     PEERS_SECTION="  - npub: \"${FIPS_PEER_NPUB}\"
     alias: \"${FIPS_PEER_ALIAS}\"
     addresses:
-      - transport: udp
+      - transport: ${FIPS_PEER_TRANSPORT}
         addr: \"${FIPS_PEER_ADDR}\"
     connect_policy: auto_connect"
 fi
@@ -40,6 +41,7 @@ transports:
   udp:
     bind_addr: "${FIPS_UDP_BIND}"
     mtu: 1472
+  tcp: {}
 
 peers:
 ${PEERS_SECTION:-  []}
@@ -61,6 +63,8 @@ iptables -A OUTPUT -o eth0 -p udp --dport 2121 -j ACCEPT
 iptables -A OUTPUT -o eth0 -p udp --sport 2121 -j ACCEPT
 iptables -A INPUT  -i eth0 -p udp --dport 2121 -j ACCEPT
 iptables -A INPUT  -i eth0 -p udp --sport 2121 -j ACCEPT
+iptables -A OUTPUT -o eth0 -p tcp --dport 443 -j ACCEPT
+iptables -A INPUT  -i eth0 -p tcp --sport 443 -j ACCEPT
 iptables -A OUTPUT -o eth0 -j DROP
 iptables -A INPUT  -i eth0 -j DROP
 

testing/sidecar/scripts/build.sh

@@ -38,6 +38,7 @@ if [ "$UNAME_S" = "Darwin" ]; then
     echo "Copying binaries to docker context..."
     cp "$PROJECT_ROOT/target/$CARGO_TARGET/release/fips" "$DOCKER_DIR/fips"
     cp "$PROJECT_ROOT/target/$CARGO_TARGET/release/fipsctl" "$DOCKER_DIR/fipsctl"
+    cp "$PROJECT_ROOT/target/$CARGO_TARGET/release/fipstop" "$DOCKER_DIR/fipstop"
 else
     echo "Building FIPS (release)..."
     cargo build --release --manifest-path="$PROJECT_ROOT/Cargo.toml"
@@ -45,9 +46,10 @@ else
     echo "Copying binaries to docker context..."
     cp "$PROJECT_ROOT/target/release/fips" "$DOCKER_DIR/fips"
     cp "$PROJECT_ROOT/target/release/fipsctl" "$DOCKER_DIR/fipsctl"
+    cp "$PROJECT_ROOT/target/release/fipstop" "$DOCKER_DIR/fipstop"
 fi
 
-echo "Done. Binaries at $DOCKER_DIR/{fips,fipsctl}"
+echo "Done. Binaries at $DOCKER_DIR/{fips,fipsctl,fipstop}"
 echo ""
 echo "Building Docker image..."
 docker compose -f "$DOCKER_DIR/docker-compose.yml" build