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# CB CoreEngine — R&D Summary (Malaysia Telco Reality)

## 1. Latar Belakang Projek
CB (Companion Bot) dibangunkan untuk membantu kestabilan & kebarangkalian order masuk bagi app Panda (food delivery).

Asal idea:
- Sniff traffic Panda (guna PCAPdroid)
- Kenal pasti host / pattern order masuk
- Kekalkan network dalam keadaan “warm & stable”

Realiti:
- VPN tunneling manual (tun2socks / custom forwarder) **GAGAL**
- Panda tiada internet walaupun VPN hijau
- TCP connection sentiasa **RST / FIN awal**

---

## 2. Kenapa tun2socks & VPN custom FAIL
### Observation:
- UDP boleh jalan (DNS, small packets)
- TCP handshake OK
- TLS ClientHello SEND OK
- Server balas **7 bytes sahaja → RST / FIN**

### Kesimpulan:
Ini **BUKAN bug code semata-mata**, tapi:
- TCP stack incomplete
- Tiada proper TCP state machine
- Sequence / ACK / Window mismatch
- TLS server (CloudFront / Akamai / Perseus) **reject**

> tun2socks ≠ solution sniffing  
> tun2socks = redirect traffic, bukan emulate full TCP/IP stack

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## 3. Kenapa PCAPdroid BOLEH sniff
PCAPdroid:
- Guna **VpnService**
- **TIDAK forward traffic**
- Kernel Android handle TCP/IP sepenuhnya
- App hanya READ packet (TUN read-only)

Key point:
> PCAPdroid **tidak interfere TCP**
> sebab itu app target kekal ada internet

Native `.so` mereka:
- Untuk parsing & export packet
- BUKAN TCP engine

👉 Sebab itu “download native PCAPdroid” **tak solve masalah forward**

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## 4. Discovery Paling Penting (BREAKTHROUGH)
### Pattern sebenar (Chrome & Panda):
- Connect → OK
- Send data → OK
- Response kecil (7 bytes)
- Immediate **RST / FIN**

Makna:
> Server detect connection **TAK NORMAL**
> dan force close

Ini konsisten dengan:
- CDN security
- Anti MITM
- Anti proxy / tunnel

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## 5. Hypothesis sebenar: Kenapa order senang masuk bila PCAP ON
Bukan sebab “ping host perseus”.

Lebih tepat:
- PCAPdroid VPN → **network path stabil**
- Connection reuse (keep-alive) jadi lebih konsisten
- Network stack kekal aktif
- Radio LTE tak masuk idle aggressive
- DNS resolution tak reset

➡️ **Network “warm” > packet manipulation**

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## 6. Pivot Besar: Buang VPN, lahirkan CoreEngine (CE)
CB direka semula:
- ❌ Tiada VPN tunnel
- ❌ Tiada packet forward
- ❌ Tiada MITM

### CoreEngine Objective:
> Kekalkan keadaan network optimum  
> TANPA sentuh payload

---

## 7. CoreEngine Responsibilities
### Network Layer:
- Kekalkan radio LTE/WiFi active
- Elak aggressive idle
- Elak DNS cache reset
- Elak TCP cold start

### System Layer:
- Partial wakelock
- Network request foreground
- Elak app kill oleh system

### GPS Layer:
- Lock location
- Kurangkan jitter
- Pastikan accuracy stabil semasa order masuk

---

## 8. DNS Strategy (Realiti Telco Malaysia)
Fakta:
- Telco Malaysia throttle / degrade silently
- DNS popular (1.1.1.1, 8.8.8.8) overload

### Design:
CB guna **DNS changer style (NON-VPN)**

UI:
- Button **ON A** → DNS A (custom, stable)
- Button **ON B** → DNS B (1.1.1.1 fallback)
- Button **OFF** → restore default

Important:
- DNS apply **system-wide**
- Panda TAK isolated DNS
- Fokus pada **path stability**, bukan privacy

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## 9. Kenapa BUKAN isolate Panda DNS
Android:
- Tiada per-app DNS tanpa VPN
- VPN = masalah lama berulang

Decision:
> Lebih baik **global DNS stable**
> daripada per-app DNS yang rosak

---

## 10. Role Baru CB
CB bukan:
- VPN
- Proxy
- Packet manipulator

CB ialah:
> **Network Conditioning Engine**

Dia:
- Panaskan network
- Kekalkan consistency
- Kurangkan jitter & reset

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## 11. Button Workflow (Updated)
### ON A / ON B:
- Activate CoreEngine
- Apply DNS
- Enable wakelock
- Stabilize GPS
- Toast: “CoreEngine Active”

### OFF:
- Force stop Panda
- Release wakelock
- Restore DNS
- Reset state

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## 12. Next Step (Session Baru)
Dalam session baru:
1. Implement **DNS changer NON-VPN**
2. Implement **wakelock + network request**
3. GPS lock refinement
4. Memory pressure monitoring
5. UI ON A / ON B logic

🚫 Jangan sentuh packet / TCP / VPN lagi

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## Final Truth (No Sugarcoat)
❌ VPN sniff + forward = dead end  
❌ tun2socks bukan tool untuk kes ini  

✅ Network conditioning + stability = jalan sebenar

Ini bukan hacking.
Ini **understanding telco + Android behavior**.

— End of R&D —