> ## Documentation Index > Fetch the complete documentation index at: https://devzone.nayax.com/llms.txt > Use this file to discover all available pages before exploring further. # Configuration Parameters The EMV Core configuration determines how your terminal functions, handles transactions, and interacts with external systems. Settings use a standard `=` format (e.g., `TMS_SVC_URL=tms.otiglobal.com`). ## Managing settings Configuration is handled centrally through the **Nayax Core** server. To adjust these settings: 1. Navigate to **Operations** > **Machines**. 2. Locate the **Embedded** and **Embedded Advanced** sections. 3. Click the **?** next to specific fields to identify which configuration parameters correspond to the options on the page. Once saved, the server generates a configuration file and automatically pushes it to the device. Nayax Core manages this configuration file. Do not manually edit or delete it on the device: doing so can prevent the device from working correctly. If it happens by mistake, use **Actions** > **Reload Configuration** in Nayax Core to push the configuration from the server again. The table below lists the primary configuration keys available for both platforms: | Category | Parameter Name | Description | Type | Default Value | Platform Notes | | :-------------------- | :---------------------------- | :------------------------------------------------------------------------------------------------------------------ | :--------- | :---------------------------- | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Network & System** | `ETH_INTERFACE` | Network interface for reporting; autodetects if empty. | String | empty | Fallback to eth0. | | | `KIOSK_USE_TCP_SOCKETS` | Set to 1 to use TCP ports 10000 (cmd) and 10001 (events). | Bool (1/0) | 0 | Disables domain sockets if set. | | | `DAILY_RESTART_HOUR` | Automatic daily reboot hour (0-23); 0 is disabled. | U8 | 0 | Reboot occurs within 30 minutes of the set hour. | | | `KIOSK_TCP_LOCALHOST` | Limits EMV Core sockets to the localhost interface. | Bool (1/0) | 0 | Introduced in SDK v0.7. | | | `DNS_ENTRY_1` … `DNS_ENTRY_5` | Static hostname-to-IP mapping entries; injected into `/etc/hosts` at startup (e.g., `192.168.1.10 myserver.local`). | String | none | Introduced in SDK v1.5. | | | `SOCKET_OPEN_MAX_TIMEOUT` | Maximum socket connection timeout, in seconds. | Int (sec) | none | Introduced in SDK v1.5. | | | `TEST_COMMANDS_ENABLED` | Unlocks `TEST_*` JSON-RPC commands for test automation. | Bool (1/0) | 0 | Introduced in SDK v1.5. Do not enable in production. | | | `NO_READER_RESTART_TIMEOUT` | How long to wait for the reader to respond before rebooting. | Int (sec) | 3600 | Introduced in SDK v1.5. Minimum 60 seconds. | | **TMS & Payment** | `TMS_SVC_URL` | URL for Terminal Management System. | URL String | tms.otiglobal.com | Use tms-c.otiglobal.com for Nayax Core. | | | `PAYMENT_SVC_URL` | URL for payment processing server. | URL String | payment-nayax-p.otiglobal.com | Max 256 characters. | | | `SERVER_POLL_INTERVAL` | Seconds between calls to the server for updates. | U16 | 600 | Low values increase data usage. | | **Reader Settings** | `READER_IS_SERIAL` | 0=USB, 1=Serial, 2=Auto-detect. | 0/1/2 | 2 | Removed in SDK v1.4; use `READER_SERIAL_PORT`. | | | `READER_SERIAL_PORT` | Sets the actual port device (e.g., /dev/ttyS0). | String | None (USB) | Not supported in Android SDK. | | | `CURRENCY_CODE` | ISO 4217 code (e.g., 840 for USD). | String | 840 | v1.4 takes this from Nayax Core automatically. SDK v1.5 adds a further fallback to the reader's kernel currency tag (9F3C) on the first transaction before defaulting to 840. | | | `AUDIO_PERCENTAGE` | Sets the reader's audio volume (UNO-8/PLUS only). | U8 | unset | Introduced in SDK v1.5. | | **Open Loop Payment** | `OPEN_LOOP_ENABLED` | Enables/Disables open-loop payment. | Bool (1/0) | 0 | Introduced in SDK v0.7. Default changed from `1` to `0` in SDK v1.5. | | | `PMT_ACCEPT_OFFLINE` | Automatically approves auth when network is down (Store & Forward). | Bool (1/0) | 0 | 0=Disabled, 1=No comm, 2=Always. Deprecated in SDK v1.5; use the [`deferred`](/docs/integrate-pos-device/emv-core/sdk-methods-functions/payment-1#preauthorize) parameter in `PreAuthorize` instead. | | | `PRE_AUTH_AMOUNT` | Default pre-authorization amount if not provided by API. | Int | 0 | Provided in cents. | | **Closed Loop (CLP)** | `CLP_MIFARE_ENABLED` | Enables Mifare detection as a closed loop. | Int | 2 | 0=Off, 1=Server approval, 2=Local Host API. | | **Logging** | `LOG_FILE_SIZE` | Max size in KB for each log file. | Int | 1024 | Default was 256 KB before SDK v1.2. | | | `LOG_NO_OF_FILES` | Number of log files kept before rotation. | Int | 10 | Default was 6 before SDK v1.2. |