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Changelog

Anjay Lite 3.0.2 (September 10th, 2026)

Bugfixes

  • Fixed a bug where CoAP downloader retries were not being triggered when exchange was timed out, but the socket was still connected.
  • Fixed a bug where CoAP downloader didn't send Empty ACK in separate response mode at the end of the download and after the last block before calling anj_coap_downloader_suspend().

Anjay Lite 3.0.1 (August 28th, 2026)

Bugfixes

  • Empty Plain Text and Opaque payloads in Write operations are now processed as zero-length string and byte values instead of being skipped.
  • Pinned the GitPython Python package to a specific version, as version 3.1.60 contains a regression.

Anjay Lite 3.0.0 (August 21st, 2026)

BREAKING CHANGES

  • Mark anj_crypto_storage_* API as experimental.
  • Flags ANJ_FOTA_WITH_COAPS, ANJ_NET_WITH_DTLS, ANJ_WITH_SECURITY and ANJ_WITH_MBEDTLS are now enabled by default to comply with Secure by Default policy. Flag ANJ_FOTA_WITH_COAP is now disabled by default.
  • Removed ANJ_MBEDTLS_TLS_VERSION. ANJ_MBEDTLS_ALLOWED_CIPHERSUITES has been replaced with separate ANJ_MBEDTLS_ALLOWED_CERT_CIPHERSUITES and ANJ_MBEDTLS_ALLOWED_PSK_CIPHERSUITES options.
  • Modified anj_crypto_storage_* API, all records are now added in a single call.
  • Removed anj_dm_security_obj_get_psk() function.

Features

  • Added support for certificate-based security in Anjay Lite and the Mbed TLS integration layer.
  • Added Trust Store support for certificate-based security.
  • Added a retry mechanism in COAP Downloader configured by anj_coap_downloader_configuration_t::retry_count and anj_coap_downloader_configuration_t::retry_delay.
  • Added anj_coap_downloader_suspend() and anj_coap_downloader_resume() API to CoAP Downloader.
  • New security.h API allows you to retrieve security configuration from the Security Object.
  • Add anj_crypto_zeroize() API for securely clearing sensitive data.

Improvements

  • Changed the Bootstrap transaction flow so that a single transaction now covers the entire Bootstrap process. This allows changes made during Bootstrap to be committed only after a successful Bootstrap Finish, instead of committing each LwM2M operation independently.
  • Registration Retry attempts now log the total count of attempts.
  • tools/mbedtls_cache.py has been introduced to easily manage different versions and configurations of MbedTLS builds.
  • Removed usages of attribute((unused)) from the codebase.
  • Refactored and streamlined the anj_crypto_storage_* usage flow.

Bugfixes

  • Fixed an issue in the Mbed TLS integration related to the close function. When the Connection ID extension was not supported, no new handshake was performed when reconnecting after calling the close function.

Anjay Lite 2.1.2 (June 2nd, 2026)

Improvements

  • Updated documentation links in README.md.

Anjay Lite 2.1.1 (May 29th, 2026)

Bugfixes

  • Added files necessary for installing pymbedtls (needed for integration tests)

Anjay Lite 2.1.0 (May 27th, 2026)

Features

  • (commercial version only) Added support for OSCORE with Appendix B2 procedure.

Improvements

  • Internal headers now consistently prefix internal enum and macro symbols with _ANJ_ to avoid public-looking symbol leakage.
  • Improved and refactored logging to provide more detailed and informative messages.
  • Replace all usleep() uses in examples with nanosleep().
  • Improved anj_core_next_step_time() so that it also reflects delays before scheduled Bootstrap and Registration retry attempts.

Bugfixes

  • Fixed a bug where the network context was not properly closed and cleaned up after a connection failure during Bootstrap.
  • Fixed sending retransmissions after receiving ACK (separate response)
  • Fixed a bug that caused an assertion failure when handling a request with an empty token.
  • Added Message ID validation for received messages.
  • Fixed incorrect handling of a Non-confirmable Execute operation.
  • Fixed missing empty ACK for confirmable separate error responses (CoAP 4.xx/5.xx) in the exchange layer.
  • Fix a bug that made PSK identity length validation based on MBEDTLS_PSK_MAX_LEN instead of ANJ_MBEDTLS_PSK_IDENTITY_MAX_LEN

Anjay Lite 2.0.0 (January 29th, 2026)

BREAKING CHANGES

  • Removed support for TCP and TLS bindings in NET layer - ANJ_NET_WITH_TCP, ANJ_COAP_WITH_UDP, ANJ_COAP_WITH_TCP options were removed.
  • Removed anj_net_shutdown from NET layer.
  • Monotonic time is now the primary clock used for scheduling operations, replacing real-time clock usage across the codebase.

Features

  • NTP module for time synchronization.
  • (commercial version only) Added default OSCORE Object implementation.
  • Added support for canceling observations with CoAP RST message.
  • Re-introduced anj_core_ongoing_operation API.
  • Added ANJ_OBSERVE_OBSERVATION_CANCEL_ON_TIMEOUT option to control behavior in case of notification timeouts.
  • Introduced ANJ_LOG_MICRO option for optimizing footprint of logging with tools/micro_logs_decode.py tool to decode log messages.

Improvements

  • Switch RNG implementation from getrandom() to getentropy() for improved portability.
  • Tests structure refactored in order to increase coverage.
  • Shorter Send operation payloads due to the use of a common path when encoding messages.
  • MbedTLS integration layer sets the correct MTU value.
  • MbedTLS is now fetched and compiled only once when calling make all via root CMakeLists.txt.

Bugfixes

  • Fixed a bug in TLV decoder that incorrectly rejected request with a resource instance specified in the uri-path.
  • Fixed handling of Discover requests targeting the root path.
  • Fixed incorrect descriptions of return values in callbacks from FOTA.
  • Writes to Object Instances now ignore unknown optional Resources, per LwM2M specification.

Anjay Lite 1.0.0 (October 20th, 2025)

BREAKING CHANGES

  • Implemented new Time API with distinct clock types: anj_time_real_t, anj_time_monotonic_t, anj_time_duration_t.
  • Renamed anj_dm_res_t::operation field to anj_dm_res_t::kind.
  • Renamed anj_dm_res_operation_t type to anj_dm_res_kind_t.
  • Moved anj/log/log.h header to anj/log.h.
  • Removed anj_core_ongoing_operation API.
  • Removed anj_dm_bootstrap_cleanup API.

Bugfixes

  • Fixed broken README.md link in integrations documentation

Anjay Lite 1.0.0-beta.2 (August 27th, 2025)

BREAKING CHANGES

  • Changed error codes defined in the anj_net_api.h to positive values. Returning any positive values from the user Network API implementation, other than ANJ_NET_E*, is prohibited.
  • New mandatory anj_net_queue_mode_rx_off_t API with example per-binding implementations, including anj_udp_queue_mode_rx_off() and anj_dtls_queue_mode_rx_off() were added.
  • Removed anj_net_reuse_last_port_t with example per-binding implementations.
  • Changed anj_dm_transaction_end_t last argument.

Features

  • CoAP Downloader module for large file transfers from CoAP servers, supporting FOTA Pull scenarios.
  • Added support for Write-Composite operation.
  • Persistence module and mechanism for Security and Server objects store/restore.

Improvements

  • Added anj/init.h header to make config includes and option dependency checks more consistent.
  • Removed unnecessary usages of ANJ_CONTAINER_OF() in object implementation examples.
  • Introduce Python tools for downloading object XMLs from OMA registry - tools/lwm2m_object_registry.py and generating object stubs - tools/anjay_codegen.py
  • Implemented responses caching.
  • If no confirmable notification is sent for 24 hours, the next notification sent will be confirmable.
  • The library now follows the include pattern recommendations from Include What You Use (IWYU) version 0.24 compatible with clang 20.

Bugfixes

  • Fixed improper handling of LwM2M Server responses in Separate Response mode.
  • Updated default value in description of ANJ_COAP_MAX_OPTIONS_NUMBER option.
  • Fixed an issue with calling the observation module API during message exchange handling.
  • Corrected the timing for setting the last sent notification timestamp.
  • Fixed an issue that allowed server both bootstrap and management to freely read the Security and OSCORE objects.

Anjay Lite 1.0.0-beta.1 (June 9th, 2025)

Initial release.