Nexus-FCA v3.1.1 – 🏆 THE BEST, SAFEST, MOST STABLE FCA

Modern, safe, production‑ready Messenger (Facebook Chat) API layer with email/password + appState login, proxy support, random user agent, adaptive session & connection resilience, proactive cookie refresh, MQTT stability enhancements, delivery reliability safeguards, memory protection, and rich runtime metrics. Promise + callback compatible, TypeScript typed, minimal friction.

🎉 NEW in 3.1.1 - Industry Leading Features!

• ✅ Smart MQTT Recovery - Auto-refreshes Sequence ID on errors to prevent loops
• ✅ Proactive Lifecycle Management - Randomized reconnects (26-60m) to mimic human behavior
• ✅ Email/Password Login - Login with Facebook credentials (not just cookies!)
• ✅ Advanced Proxy Support - HTTP/HTTPS/SOCKS5 proxy for all connections
• ✅ Random User Agent - 14+ realistic user agents to avoid detection
• ✅ Enhanced Configuration - autoMarkRead, emitReady, bypassRegion, and more!
• ✅ Environment Variables - Full configuration via env vars
• ✅ Best-in-Class Stability - Proactive cookie refresh + MQTT recovery + session protection!

✅ Core Value

🔄 What Changed in 3.0.0

Major version signals maturity & consolidation. No breaking public API changes versus late 2.1.x – upgrade is drop‑in. Temporary diagnostic harness removed; internal instrumentation formalized. Delivery receipt timeouts now intelligently retried & optionally auto-suppressed to protect outbound responsiveness.

🚀 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: 'your-email@example.com',  // 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

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)

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

� Migrating 2.1.x → 3.0.0

🗂 Previous 2.1.x Highlights (Condensed)

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)