Every C SDK version is listed below, from the current version down to the first release.
| Version | Date | Summary |
|---|---|---|
| 0.0.2.29 (Current) | October 28, 2025 | Added site ID and brand name transfer via transfer data and a new technician-mode command to open the door remotely; enhanced error handling with improved validation and more descriptive messages; fixed a bug related to a high com_id value |
| 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 |