Nexus-FCA v3.4.0 ⚡🚀

Ultra-Fast, Secure & Stable Facebook Messenger API
Engineered for Speed, Stability & Zero Detection

🔥 New in v3.4.0 (Performance Update)

• ⚡ Parallel Message Sending: Send up to 5 messages concurrently with setParallelSend() - 3x faster response times!
• 🚀 Fast Send Mode: Bypass queue completely with setFastSend(true) for instant replies (competition-level speed).
• 📊 Configurable Queue System: Fine-tune with enableGroupQueue() and setGroupQueueCapacity() for your needs.
• 🧠 Smart Concurrency: Default 3 parallel sends - balanced speed and safety out of the box.
• 🛡️ Retained Safety Features: All security mechanisms preserved - toggle speed vs safety as needed.
• 📈 Benchmarked Performance: Matches fca-unofficial speed while maintaining superior stability.

✅ Core Value

| Pillar | What You Get | |--------|--------------| | ⚡ Ultra-Fast Messaging | Parallel sends (up to 5x), Fast Send mode, instant response times | | Integrated Secure Login | Username / Password / TOTP 2FA → stable appstate generation & reuse | | Session Resilience | Anchored User‑Agent continuity, adaptive safe refresh, lightweight token poke, periodic recycle | | Connection Stability | Adaptive MQTT backoff, idle & ghost detection, layered post-refresh health probes, synthetic keepalives | | Delivery Reliability | Multi-path message send fallback (MQTT → HTTP → direct) + delivery receipt timeout suppression | | Memory Guard | Bounded queues, edit TTL sweeps, controlled resend limits | | Observability | Health + memory + delivery metrics (api.getHealthMetrics(), api.getMemoryMetrics()) | | Edit Safety | Pending edit buffer, ACK watchdog, p95 ACK latency tracking | | Type Definitions | First-class index.d.ts with modern Promise signatures |

⚡ Speed vs Safety - Your Choice!

// MAXIMUM SPEED - Bypass queue (like fca-unofficial)
api.setFastSend(true);

// BALANCED (Default) - 3 concurrent sends  
api.setParallelSend(3);

// MORE SPEED - Up to 5 concurrent
api.setParallelSend(5);

// MAXIMUM SAFETY - Sequential queue
api.setParallelSend(1);
api.setFastSend(false);

🔄 What Changed in 3.4.0

Major performance upgrade! No breaking changes - just faster. New parallel messaging system rivals competitors while keeping all safety features optional. Default configuration is balanced (3 concurrent sends). Power users can enable setFastSend(true) for maximum speed.

🚀 Quick Start

Option 1: AppState Login (Most Stable)

const login = require('nexus-fca');

(async () => {
  const api = await login({ appState: require('./appstate.json') }, {
    autoReconnect: true,
    randomUserAgent: true  // NEW!
  });
  console.log('Logged in as', api.getCurrentUserID());
  api.listen((err, evt) => {
    if (err) return console.error('Listen error:', err);
    if (evt.body) api.sendMessage('Echo: ' + evt.body, evt.threadID);
  });
})();

Option 2: Email/Password Login (NEW!)

const login = require('nexus-fca');

(async () => {
  const api = await login({
    email: '[email protected]',  // NEW!
    password: 'your-password'          // NEW!
  }, {
    autoReconnect: true,
    randomUserAgent: true,             // NEW!
    proxy: 'socks5://127.0.0.1:1080'  // NEW!
  });
  console.log('✅ Logged in!');
  api.listen((err, msg) => {
    if (err) return console.error(err);
    if (msg.body === 'ping') api.sendMessage('pong', msg.threadID);
  });
})();

Option 3: With Proxy + Random UA (NEW!)

const login = require('nexus-fca');

(async () => {
  const api = await login({ appState: require('./appstate.json') }, {
    proxy: 'http://proxy.example.com:8080',  // NEW!
    randomUserAgent: true,                    // NEW!
    autoMarkRead: true,                       // NEW!
    emitReady: true,                          // NEW!
    bypassRegion: 'PRN'                       // NEW!
  });
  
  api.on('ready', () => console.log('🚀 Bot ready!'));
  api.listen((err, msg) => {
    if (err) return console.error(err);
    if (msg.body) api.sendMessage('Echo: ' + msg.body, msg.threadID);
  });
})();

🧪 Key Runtime APIs

api.setEditOptions({ maxPendingEdits, editTTLms, ackTimeoutMs, maxResendAttempts });
api.setBackoffOptions({ base, factor, max, jitter });
api.enableLazyPreflight(true);       // Skip heavy validation if recent success
api.getHealthMetrics();              // uptime, reconnects, ack latency, delivery stats
api.getMemoryMetrics();              // queue sizes & guard counters

Monitoring Snippet

setInterval(() => {
  const h = api.getHealthMetrics();
  const m = api.getMemoryMetrics();
  console.log('[HEALTH]', h?.status, 'acks', h?.ackCount, 'p95Ack', h?.p95AckLatencyMs);
  console.log('[DELIVERY]', {
    attempts: h?.deliveryAttempts,
    success: h?.deliverySuccess,
    failed: h?.deliveryFailed,
    timeouts: h?.deliveryTimeouts,
    disabledSince: h?.deliveryDisabledSince
  });
  console.log('[MEM]', m);
}, 60000);

🛡️ Safety & Stability Architecture

| Layer | Mechanism | Purpose | |-------|-----------|---------| | UA Continuity | Single anchored fingerprint | Avoid heuristic expiry & drift | | Adaptive Refresh | Risk-aware timing bands | Token longevity without bursts | | Lightweight Poke | Subtle fb_dtsg renewal | Keeps session warm quietly | | Collision Guard | 45m spacing window | Prevent clustered maintenance events | | Idle / Ghost Probe | Timed silent detection | Force reconnect on stale sockets | | Periodic Recycle | Randomized (~6h ±30m) | Pre-empt silent degradation | | Backoff Strategy | Exponential + jitter | Graceful network recovery | | Delivery Suppression | Disable after repeated timeouts | Preserve send latency |

Disable heavy preflight if embedding inside a framework already doing checks:

await login({ appState }, { disablePreflight: true });

🛰️ MQTT Enhancements (Since 3.1.x)

• Smart Recovery: Fetches fresh Sequence ID before reconnecting on errors (prevents stale token loops)
• Lifecycle Management: Proactive randomized reconnects (26-60m) to avoid long-session forced disconnects
• Adaptive reconnect curve (caps 5m)
• Layered post-refresh probes (1s / 10s / 30s)
• Synthetic randomized keepalives (55–75s)
• Structured error classification feeding metrics

✉️ Delivery Reliability

• Multi-path send fallback (MQTT publish → HTTP send → direct fallback)
• Per-attempt timeout & retry for message delivery receipts
• Automatic classification of transient timeouts (ETIMEDOUT / ECONNRESET / EAI_AGAIN)
• Adaptive suppression of delivery receipt calls when environment unstable (protects primary send throughput)

🧠 Long Session Best Practices

1. Prefer appstate reuse (minimal credential logins).
2. Preserve persistent-device.json (only delete if forced challenge).
3. Don’t manually rotate User-Agent – built-in continuity handles it.
4. Inspect metrics before forcing reconnect; let backoff work.
5. Keep dependencies updated; review CHANGELOG for operational notes.

🐐 Using with GoatBot V2 (Summary)

| Goal | Steps | |------|-------| | Generate appstate | Run credential login script → save appstate.json → configure GoatBot | | Full replacement | Install nexus-fca → shim fb-chat-api/index.js exporting module | | Direct require swap | Replace require('fb-chat-api') with require('nexus-fca') |

Minimal example:

const login = require('nexus-fca');
(async () => {
  const api = await login({ appState: require('./appstate.json') });
  api.listen((err, event) => {
    if (err) return console.error(err);
    if (event.body === '!ping') api.sendMessage('pong', event.threadID);
  });
})();

📚 Documentation Map

| Resource | Location | |----------|----------| | Usage Guide (Examples) | USAGE-GUIDE.md | | Full API Reference | DOCS.md | | Feature Guides | docs/*.md | | Configuration Reference | docs/configuration-reference.md | | Safety Details | docs/account-safety.md | | Examples | examples/ |

� Migrating 2.1.x → 3.0.0

| Area | Action Needed | |------|---------------| | Public API | None (fully compatible) | | Diagnostics Harness | Removed (no action) | | Delivery Metrics | Optionally surface in dashboards | | Safety Manager (legacy) | Keep removed / unused |

🗂 Previous 2.1.x Highlights (Condensed)

| Version | Focus | Key Additions | |---------|-------|---------------| | 2.1.10 | Stabilization | Final 2.1.x meta adjustments | | 2.1.8 | Safety Consolidation | Unified orchestrator, collision spacing, recycle suppression | | 2.1.7 | Session Longevity | UA continuity, lightweight poke | | 2.1.6 | Memory Guard | Queue pruning, edit TTL sweeps | | 2.1.5 | Edit Reliability | PendingEdits buffer, ACK watchdog |

Full details remain in CHANGELOG.md.

⚠️ Disclaimer

Not affiliated with Facebook. Use responsibly and comply with platform terms & local laws.

🤝 Contributing

Focused PRs improving stability, safety heuristics, protocol coverage, or typings are welcome.

📜 License

Team Nexus

MIT © 2025 Nexus (Team Nexus)