> ## 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. # EMV Core RTOS SDK Release Notes > Track EMV Core RTOS SDK changes as they ship. Nayax logs EMV Core RTOS SDK changes on this page as they ship. Subscribe to the RSS feed using the icon at the top of the page to get notified of new entries. Release notes are organized into three categories to help you evaluate the impact of each update: * **Improvements**: New API commands, expanded platform and card support, and performance enhancements. * **Fixes**: Resolved bugs and reliability improvements. * **Known Issues**: Current limitations or pending features, with recommended workarounds. *Released: 11 February 2026* This version includes the following improvements, fixes, and known issues for the RTOS SDK: ### **Linux Sample Application (Portable C Sources)** SDK callback architecture refactored for better compiler compatibility (RM7434). JSON-RPC messages are now logged by default in the sample application (RM7471). *** ### **TLS Support** Secure server communication via TLS for both TMS and payment service connections (RM7021). *** ### **External Settlement (Remote Settlement)** `TransactionComplete` now returns an `Additional_Parameters` field with the data required for Nayax server-to-server External Settlement (RM7549): * `SiteId`: unique identifier of the transaction site * `EntryMode`: transaction entry mode (Swipe, Contact, NFC) * `MachineAuTime`: machine authorization time * `NayaxTransactionId`: transaction ID *** ### **e-Receipt Support** `TransactionComplete` now returns the data required for the Nayax e-Receipt. *** ### **CLP Card Type Detection** `TransactionComplete` now returns the closed-loop card type. *** ### **Reserved for Future Use** The following features are included but not yet fully tested and should not be used: * `UpdateMachineAttributes` API * Enhanced `SendToReader` functionality with TLS-based permissions * Push service integration ### **libecodsdk Library** * Network Status Notifications * Threading Model: Dual-Thread Architecture * New configuration options in `ecod_sdk_configs.h`: * `EC_ACK_TIMEOUT_MS`: timeout for ACK responses (default: 1000 ms) * `EC_ACK_MAX_RETRIES`: maximum retries for unacknowledged frames (default: 0) * `EC_SUPPORT_LONG_LIVED_SOCKETS`: enable persistent socket connections * New status value: `EC_DISABLED`, indicates EMV Core is in a disabled state *** ### **Platform Layer** * Added `ecod_platform_init()` for platform-specific initialization * Serial port data flushing on port open * Linux: SIGPIPE signal handling to prevent crashes on socket disconnections *** ### **Logging** * Log files limited to 336 KB total to protect critical operations (RM7534) * Fix: Log upload now includes the most recent entries (issue #7357) * Auto-cleanup of excess log files on configuration change (RM7539) * New log level: `EC_LOG_LEVEL_TRACE` for detailed debugging * File logging support added * Improved log formatting with module prefixes *** ### **Configuration & Storage** * Periodic file system cleanup for long-term reliability (RM7527) * Reader file-system cleanup to prevent storage exhaustion (RM7531) * Fix: Configuration file corruption during updates (RM7533) *** ### **Payment Parameters (`emvCorePaymentParameters`)** * Removed: `fee_cents` and `currency_code` * Added: `additional_receipt_data`, `is_final_amount`, `is_deferred` (RFU) *** ### **Reader Communication** * Backwards compatibility with ECOD v0.9 * Device auto-recovers when reader misses configuration files (RM7573) * Reader configuration update reliability improved with retry mechanism (RM7575) * Socket response timeout handling improved (RM7578) * ACK/NAK handling with automatic retransmission * Better handling of fragmented serial messages * Frame size validation *** ### **Network Bridge (Socket API)** * Nagle's algorithm disabled for reduced latency on small packets * Optimized socket data arrival notifications * Automatic network connectivity monitoring (Linux) *** ### **User Interface** * Fix: `ReaderMessage` events now include correct message index (RM7470) * Fix: "Present card" message displays immediately after `PreAuthorize` (RM7553) * Fix: LED blinking behavior corrected during Poll EMV (RM7585) *** ### **Reader Firmware** * Safe dual-mode operation (TLV and JSON-RPC) (RM7571, RM7572, RM7584) * Firmware update package size reduced ### **Intermittent TLV Messages (RM7586)** Device may intermittently send TLV format messages instead of JSON-RPC. *** ### **Slow First Response After Reset (RM7592)** Serial communication: the first response after reset may be slow. *** ### **Virtual Machine Device Discovery** On virtual Linux machines (e.g., WSL or VirtualBox), the host sample application cannot find the device after it restarts: ``` SERIAL [ERROR] failed to open HID port /dev/hidraw0: No such file or directory ``` This occurs because the virtual OS attaches the reader with a different name (e.g., `hidraw1`). Not relevant for physical operating systems. ### Version history Every earlier RTOS SDK version, condensed to one line. See the current version above for full detail and links. | Version | Date | Summary | | --------------- | ----------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | SDK Version 0.9 | July 31, 2025 | **Added**:**Fixed** (#7052, #7054, #7056, #7072, #7233): | | SDK Version 0.2 | March 24, 2025 | **Added**:**Fixed** (#7077, #7043, #7051): | | SDK Version 0.1 | December 30, 2024 | First RTOS SDK release |