> ## 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. # Marshall C SDK Release Notes > Track Marshall C SDK changes as they ship. Nayax logs Marshall C 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 two categories to help you evaluate the impact of each update: * **Improvements**: New APIs, expanded feature support, and performance enhancements. * **Fixes**: Resolved bugs and reliability improvements. ### Transfer data and technician commands Site ID and brand name are now transferred to the machine via transfer data, and a new technician-mode command opens the door remotely. *** ### Error handling Enhanced error handling with improved validation and more descriptive messages. ### High com\_id issue Fixed a bug related to a high `com_id` value. ### Version history Every earlier C SDK version, condensed to one line. See the current version above for full detail and links. | Version | Date | Summary | | -------- | ------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | 0.0.2.28 | January 30, 2025 | Fixed a crash on cancel after `session_begin` and before `vend_request` | | 0.0.2.27 | December 16, 2024 | Transaction data is now cleared when returning to ready mode after a transaction finishes | | 0.0.2.26 | October 13, 2024 | Fixed a crash when canceling an info session | | 0.0.2.25 | October 13, 2024 | Added e-receipt support; fixed an issue handling consecutive frames received immediately from VPOS | | 0.0.2.24 | September 25, 2024 | Fixed an issue with canceled transactions | | 0.0.2.23 | April 8, 2024 | Added `long_price` support; `cpu_platform_get_time()` now returns a 64-bit value, fixing an overflow after 50 days; fixed the demo app's quit option not actually quitting | | 0.0.2.22 | April 8, 2024 | Added QR-code entry mode and third-party authorization support, a new sample application demonstrating API usage, and out-of-the-box Linux and Windows platform support | | 0.0.2.21 | April 8, 2024 | Added a display control API (`vmc_general.h`) and Keil compiler support | | 0.0.2.16 | April 5, 2023 | Fixed info session to work in always-idle setups | | 0.0.2.15 | April 4, 2023 | Added `card_sub_type` and `card_balance` transfer\_data fields and a check-balance session type | | 0.0.2.14 | January 4, 2023 | Added new transfer data fields; updated discount and final price logic for all payment types | | 0.0.2.13 | January 1, 2023 | Added new transfer data fields | | 0.0.2.12 | December 20, 2022 | `session_status` on the session object is now filled in by the SDK to report the transaction cancellation reason; added the `on_status` event callback, the `vmc_vend_event_on_session_timeout` event, and `vmc_link_get_version()` | | 0.0.2.11 | December 12, 2022 | Fixed segmentation faults printing the "moderate" log level and issuing an info session, a missing `transaction_id_len`, and a vend-cancel bug in always-idle mode | | 0.0.2.10 | December 6, 2022 | Improved rx buffer management to handle concatenated frames | | 0.0.2.9 | October 18, 2022 | Added the ability to dynamically allocate the `vmc_buffer_t` array (behind `VMC_DYNAMIC_ALLOCATION`) and crc/link statistics; fixed a socket-transmit bug so a busy socket now raises a busy event for retransmission | | 0.0.2.8 | August 24, 2022 | Added `vend_status(bool)` for explicit vend success and the total charged (and discount, if any) on the session structure | | 0.0.2.7 | July 25, 2022 | Fixed a pointer-conversion segmentation fault, an opened-sessions query always returning 0, and a `TransferData()` TransactionID length bug (extended from 4 to 8 bytes) | | 0.0.2.6 | April 6, 2022 | Added `unit_of_measure` enums to `vmc_vend`, new vend events (`session_cancled`, `sessions_rsp`, `reader_state_rsp`), QR code (e-receipt) handling, `is_in_middle_of_transaction()`, and new `fw_info` fields; fixed a bug where vend-deny persist mode stayed always-on even after a successful transaction | | 0.0.2.5 | July 20, 2021 | Fixed a multi-vend items bug | | 0.0.2.4 | June 17, 2021 | Fixed a multi-vend crash on an overflowing number of items | | 0.0.2.3 | May 19, 2021 | Added updated status codes, the `on_status` vend event, an alert feature, and support for 8-bit slim micro-controllers, plus various other bug fixes | | 0.0.2.2 | April 28, 2021 | Added updated status codes, the `on_status` vend event, and an alert feature | | 0.0.2.1 | March 17, 2021 | Added compilation flags to reduce flash usage and disable unused modules (socket, general, etc) | | 0.0.2.0 | October 1, 2020 | Added a time-update API, experimental HTTP and FTP client libraries, and native big/little-endian platform support; fixed a `vmc_socket` state-machine stall, a multi-vend bug, and an always-idle bug | | 0.0.1.3 | September 15, 2020 | Added a link events handler | | 0.0.1.2 | September 9, 2020 | Fixed a multi-vend bug | | 0.0.1.1 | August 28, 2020 | Added the Monyx card | | 0.0.1.0 | August 3, 2020 | Added a debug-level packet dump option, a vend-denied policy, and a machine type parameter | | 0.0.0.2 | April 16, 2020 | Updated transfer\_data functionality; added an STM32F0 sample application with UART/DMA support | | 0.0.0.1 | March 12, 2020 | Initial release |