Sole Akbil Validator Software - The App That Turns the Device Into a System
Updated: 2026-08-01 · Technical content: SoleAkbil Engineering Team
Last updated: 08.08.2026
The Sole Akbil Validator Software is the Android application that runs on Sole Akbil T10 and T20 in-vehicle devices. It reads the passenger's card, phone (NFC) or QR ticket; calculates the fare by card type, deducts the balance, and writes every transaction to an immutable transaction ledger. It keeps working even if the internet goes down, and automatically syncs to the central Sole Akbil panel once connectivity returns. This is the layer that turns the device from an "empty reader shell" into an end-to-end working fare collection system.
General Features
- 4 different passage methods, one device: Physical Mf Card, NFC Phone (HCE), single-use QR ticket and Credit Card are all accepted on the same terminal.
- Automatic pricing by card type: 12 card types (Full, Student, Free, Discounted, Retiree, Teacher, Blue Card/Monthly Pass, Limited-Use Ticket, Phone NFC Card, Family Support Card and 2 Custom Card Types) plus transfer discounts and birthday/public-holiday discounts are applied automatically.
- Driver/operator experience: Automatic card detection (no button press needed), 6 quick fare buttons, large accessible screen plus color LED strip, multi-language (TR/EN/FR) voice announcements.
- Anomaly and clone detection: Physically impossible situations - like the same card being used on different devices within a short window - are automatically flagged.
- Secure device pairing: One-time 8-character pairing code; the device secret is stored in hardware-backed encrypted storage. Driver login is PIN-protected.
- Kiosk lock: The device boots directly into the full-screen application; access to the Android home screen is locked down.
- Remote management: Price, fare and setting updates are pushed from the center; no need to touch each device individually.
- Lightweight and reliable: Optimized to run smoothly on 2 GB RAM / 16 GB storage devices.
Standout Features - The Technology That Makes the Difference
| Offline-first operation | Card reading, fare collection and balance top-up work even without internet. Transactions are written to a local queue (PENDING) on the device and relayed to the server in the background once connectivity returns - a journey through a tunnel, in a rural area or outside coverage is never disrupted. |
|---|---|
| Immutable transaction ledger | Every read and top-up becomes a ledger record that cannot later be deleted or edited. Revenue reconciliation and audit are closed to manipulation. |
| Customer-specific Card-ID isolation | Every operator has their own encrypted sector key. No card without the crypto applied will work on your system; a foreign / cloned card returns an "Unrecognized Card" error. This is a cryptographic defense against unauthorized card use. |
| Centralized price and settings management | A fare increase, discount or tariff change is pushed from a single point to the entire fleet; the risk of collecting at an outdated/wrong price is eliminated. |
| Clear feedback design | The passage result (accepted/rejected/balance) is announced instantly via color-coded LED plus voice; ensures fast, error-free boarding at crowded stops. |
| Decompile-proof by design | Even if the device firmware is reverse-engineered, the fare is always calculated on the server - the device's own claim is never accepted as revenue. |
How Does It Work?
- The passenger taps their card, phone or QR ticket on the validator.
- The application verifies the card's identity and type; if online, it confirms the fare with the Sole Akbil server, if offline, it processes with local rules.
- The balance is deducted, and the result is announced via LED plus voice.
- The transaction is written to the immutable ledger and synced to the central panel (from the queue, if needed).
Device and System Compatibility
| Runs on | Sole Akbil T10 and Sole Akbil T20 in-vehicle validators |
|---|---|
| Operating system | Custom Android 12-based POS operating system (TPOS) |
| Card technology | Mf Card, e-wallet (DESFire support available in the backend) |
| Local data | Encrypted local queue on device (Room), background sync (WorkManager) |
| Central integration | Atomic/idempotent balance operations with the Sole Akbil Management Panel |
| Connectivity | SIM (4G) / WiFi / Ethernet |
QR ticket and phone NFC acceptance are supported by the application; EMV Credit Card open-loop payment requires a separate payment institution (acquirer) integration on a per-project basis. The technical values stated are based on Sole Akbil's own field and integration documentation.
Frequently Asked Questions
Does the validator keep working if the internet goes down?
Yes. Card reading, fare collection and balance top-up work offline; transactions are written to a local queue on the device and automatically sent to the central panel once the connection returns. This is one of SoleAkbil's core design decisions.
Will a card from another system work on this validator?
No. Because each customer has their own Mifare sector key, cards not keyed to your system return an "Unrecognized Card" error. This is a deliberate security decision against unauthorized and cloned card use.
Do you need to visit each device individually for a price change?
No. Fare and setting updates are pushed remotely to the whole fleet from the central panel.
Which devices does the application run on?
Sole Akbil T10 and T20 in-vehicle validators. Both models can be used together in your fleet; both share the same software architecture.
Can a passenger also board with their phone or a QR ticket?
Yes. Alongside the physical card, phone NFC (HCE) and a single-use QR ticket are also supported; both of these methods always work online (server-connected). EMV Credit Card acceptance is hardware-ready; a separate payment institution integration is required for live use.
See the Validator Software on Your Fleet
Talk to our technical team for a live demo of the Sole Akbil validator software and a setup suited to your fleet.