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Release History

1.6.0-beta.1 (Unreleased)

Features Added

Breaking Changes

Bugs Fixed

Other Changes

1.5.0 (2023-01-10)

Features Added

  • [#2443] Adding IoT Device Provisioning support for Custom Allocation Payload.
    • New APIs: az_iot_provisioning_client_register_get_request_payload() and az_iot_provisioning_client_registration_state.payload.

Bugs Fixed

  • [#2437] Update ADU device information payload to GA key/values.
  • [#2443] Azure IoT Samples now display errors following the source file:line number format, allowing Visual Studio Code to automatically create links from the output log.

Other Changes

  • Azure IoT Device Provisioning Client API deprecation: az_iot_provisioning_client_get_request_payload() is deprecated in favor of az_iot_provisioning_client_register_get_request_payload(). The new API requires an initialized az_iot_provisioning_client_payload_options structure (using az_iot_provisioning_client_payload_options_default()).

1.4.0 (2022-11-11)

Features Added

  • [#2329] Add Base64 URL decoder.
  • [#2375] Add Azure Device Update for IoT Hub, enabling Over-the-Air (OTA) updates for embedded devices.

Breaking Changes

  • Modified the az_json_string_unescape() function signature to accept az_span as the destination.

Bugs Fixed

  • [#2372] Incorrect minimum buffer size calculation when logging an HTTP request.

Other Changes

  • [#2400] Updated the vcpkg baseline for installing SDK dependencies to the October 2022 tag.

1.4.0-beta.1 (2022-08-09)

Features Added

  • Added support in az_json.h to unescape JSON string tokens within an az_span using the az_json_string_unescape() API.

1.3.2 (2022-07-07)

Other Changes

  • Removed unreachable code in az_http_policy_retry.c.

1.3.1 (2022-04-05)

Bugs Fixed

  • [#2152] Fix value in user agent string.
  • [#2162] Remove failure if $version is not present in IoT Twin reported properties response topic.

1.3.0 (2022-02-08)

Features Added

  • Added a total bytes written field to the JSON writer.

Breaking Changes

  • Compared to the previous 1.2.0 release, there are no breaking changes.
  • Removed az_storage_blobs.h, which included some beta APIs for Azure Blob Storage such as az_storage_blobs_blob_client().

Bugs Fixed

  • [#2027] Update IoT user agent to append property name before property value in cases where a custom user agent was specified.
  • [#1885] Fix compilation error C4576 with C++ and MSVC 2019. (A community contribution, courtesy of hwmaier)

Acknowledgments

Thank you to our developer community members who helped to make Azure SDK for C better with their contributions to this release:

1.3.0-beta.1 (2021-11-09)

Features Added

  • Added az_http_response_get_status_code() convenience function to get HTTP status code from requests.

Bugs Fixed

  • Fixed az_curl CMake dependency propagation on libcurl.

Other Changes

  • Improved HTTP request telemetry.

1.2.0 (2021-09-08)

Features Added

  • Add az_iot_provisioning_client_get_request_payload() to create MQTT payload bodies during Device Provisioning.
  • This version provides new APIs to follow the IoT Plug and Play convention to implement Telemetry, Commands, Properties and Components defined in a DTDL model.
    • To read/write properties, the SDK now provides functions to produce the right payload for components, as shown in the header azure/iot/az_iot_hub_client_properties.h.
    • To send telemetry messages, the required header is added to identify components.
    • When responding to a command invocation the component name is automatically parsed and provided when available.
    • All new samples follow the IoT Plug and Play convention and can be connected to IoT Hub (with or without DPS), or IoT Central.

Bugs Fixed

  • [#1905] Fix the internal state of the JSON writer during calls to az_json_writer_append_json_text() by taking into account the required buffer space for commas. (A community contribution, courtesy of hwmaier)

Acknowledgments

Thank you to our developer community members who helped to make Azure SDK for C better with their contributions to this release:

1.2.0-beta.1 (2021-07-09)

New Features

  • Added a current depth field to the JSON reader.
  • Added base64 encoding and decoding APIs that accept az_span, available from the azure/core/az_base64.h header.
  • Public preview version of a new set of APIs to simplify the experience using Azure IoT Plug and Play. To consume this new feature, the az::iot::hub CMake target has been updated. The APIs can be found in the header files: az_iot_hub_client.h and az_iot_hub_client_properties.h.
  • New samples showing how to consume the new IoT Plug and Play APIs:
    • paho_iot_pnp_component_sample.c
    • paho_iot_pnp_sample.c
    • paho_iot_pnp_with_provisioning_sample.c

Bug Fixes

  • [#1640] Update precondition on az_iot_provisioning_client_parse_received_topic_and_payload() to require topic and payload minimum size of 1 instead of 0.
  • [#1699] Update precondition on az_iot_message_properties_init() to not allow written_length larger than the passed span.

1.1.0 (2021-03-09)

Breaking Changes

  • Compared to the previous 1.0.0 release, there are no breaking changes.
  • Removed az_iot_pnp_client.h, which included some beta APIs related to IoT Plug and Play such as az_iot_pnp_client().
    • These will ship in a future release (1.2.0).

Bug Fixes

  • [#1600] Make sure az_json_writer_append_json_text() appends a comma between elements of a JSON array.
  • [#1580] Fix build on Ubuntu 18.04 by updating CMake policy and MSVC runtime libraries.

1.1.0-beta.2 (2020-11-11)

Bug Fixes

  • [#1472] Fix az_iot_message_properties_next() when the buffer in which the properties were kept was bigger than the length of characters in the buffer.

Other Changes and Improvements

  • [#1473] Add remote server certificate validation on paho and ESP8266 samples.
  • [#1449] Add basic reconnection capability for the ESP8266 sample.
  • [#1490] Fix static analyzer flagging of non-checked return value in az_iot_hub_client_c2d_parse_received_topic().

1.1.0-beta.1 (2020-10-06)

New Features

  • Added an az_log_classification_filter_fn callback function type along with a setter az_log_set_classification_filter_callback(), allowing the caller to filter log messages.

Bug Fixes

  • Fix bounds check while processing incomplete JSON string containing escaped characters to avoid out-of-range access.
  • Fix Windows to use /MT when building the CRT and static libraries.
  • Fail gracefully on invalid/incomplete HTTP response processing by avoiding reading from size 0 span.

Other Changes and Improvements

  • Add precondition check to validate clients are initialized before passed in to public APIs.
  • Add high-level and simplified az_core.h and az_iot.h files for simpler include experience for customers.

1.0.0 (2020-09-21)

Breaking Changes

  • Removed az_storage_blobs.h, including APIs related to storage service such as az_storage_blobs_blob_client_init() and az_storage_blobs_blob_upload(), and types such as az_storage_blobs_blob_client and az_storage_blobs_blob_client_options.
  • Updated provisioning client struct member name in az_iot_provisioning_client_register_response from registration_result to registration_state.
  • Changed operation_status in az_iot_provisioning_client_register_response from az_span to az_iot_provisioning_client_operation_status enum.
  • Removed az_iot_provisioning_client_parse_operation_status() from az_iot_provisioning_client.h.
  • Renamed az_iot_hub_client_twin_response_type enum names:
    • AZ_IOT_CLIENT_TWIN_RESPONSE_TYPE_GET to AZ_IOT_HUB_CLIENT_TWIN_RESPONSE_TYPE_GET
    • AZ_IOT_CLIENT_TWIN_RESPONSE_TYPE_DESIRED_PROPERTIES to AZ_IOT_HUB_CLIENT_TWIN_RESPONSE_TYPE_DESIRED_PROPERTIES
    • AZ_IOT_CLIENT_TWIN_RESPONSE_TYPE_REPORTED_PROPERTIES to AZ_IOT_HUB_CLIENT_TWIN_RESPONSE_TYPE_REPORTED_PROPERTIES
  • Platform: az_platform_clock_msec(), and az_platform_sleep_msec() return az_result, which is AZ_ERROR_DEPENDENCY_NOT_PROVIDED when az_noplatform implementation is used.
  • Moved these IoT specific result codes from az_result.h to az_iot_common.h:
    • AZ_ERROR_IOT_TOPIC_NO_MATCH
    • AZ_ERROR_IOT_END_OF_PROPERTIES
  • Moved these IoT specific log classifications from az_log.h to az_iot_common.h:
    • AZ_LOG_MQTT_RECEIVED_TOPIC
    • AZ_LOG_MQTT_RECEIVED_PAYLOAD
    • AZ_LOG_IOT_RETRY
    • AZ_LOG_IOT_SAS_TOKEN
    • AZ_LOG_IOT_AZURERTOS
  • Removed AZ_LOG_END_OF_LIST log classification and az_log_set_classifications() from az_log.h.
  • Renamed az_log_set_callback() to az_log_set_message_callback().
  • Removed AZ_HTTP_STATUS_CODE_END_OF_LIST HTTP status code and status_codes field from az_http_policy_retry_options.

Bug Fixes

  • Fixed [Pe188] warning from IAR when initializing structs using { 0 }.

1.0.0-preview.5 (2020-09-08)

New Features

  • Add az_json_writer_append_json_text() to support appending existing JSON with the JSON writer.
  • Add support for system properties for IoT Hub messages to az_iot_common.h.
  • Add new HTTP result named AZ_ERROR_HTTP_END_OF_HEADERS to designate the end of the headers iterated over by az_http_response_get_next_header().
  • Add new IoT result named AZ_ERROR_IOT_END_OF_PROPERTIES to designate the end of the properties iterated over by az_iot_message_properties_next().
  • Add AZ_IOT_MESSAGE_PROPERTIES_USER_ID and AZ_IOT_MESSAGE_PROPERTIES_CREATION_TIME helper macros.
  • Add new az_result value AZ_ERROR_DEPENDENCY_NOT_PROVIDED which is returned by the HTTP adapter.

Breaking Changes

  • Rename az_iot_hub_client_properties to az_iot_message_properties and move it from az_iot_hub_client.h to az_iot_common.h.
  • Remove az_pair, and its usage from az_http_request_append_header(), az_http_response_get_next_header(), and az_iot_message_properties_next() in favor of individual name and value az_span parameters.
  • Remove az_credential_client_secret structure, and az_credential_client_secret_init() function.
  • Remove az_platform_atomic_compare_exchange() from platform.
  • In az_result.h, rename az_failed() to az_result_failed() and az_succeeded() to az_result_succeeded().
  • az_iot_is_success_status() renamed to az_iot_status_succeeded().
  • az_iot_is_retriable_status() renamed to az_iot_status_retriable().
  • az_iot_retry_calc_delay() renamed to az_iot_calculate_retry_delay().
  • az_iot_hub_client_sas_get_password() parameter token_expiration_epoch_time moved to second parameter.
  • az_iot_provisioning_client_init() parameter global_device_endpoint renamed to global_device_hostname.
  • az_iot_provisioning_client_query_status_get_publish_topic() now accepts the operation_id from the register_response as the second parameter instead of the whole az_iot_provisioning_client_register_response struct.
  • Renamed the macro AZ_SPAN_NULL to AZ_SPAN_EMPTY.
  • Renamed the az_result value AZ_ERROR_INSUFFICIENT_SPAN_SIZE to AZ_ERROR_NOT_ENOUGH_SPACE.
  • Removed the helper macros AZ_RETURN_IF_FAILED() and AZ_RETURN_IF_NOT_ENOUGH_SIZE() from az_result.h.
  • Behavioral change to disallow passing NULL pointers to az_context APIs and update documentation.
  • Removed AZ_HUB_CLIENT_DEFAULT_MQTT_TELEMETRY_DUPLICATE and AZ_HUB_CLIENT_DEFAULT_MQTT_TELEMETRY_RETAIN named constants from az_iot_hub_client.h.

Bug Fixes

  • Fix the strict-aliasing issue in az_span_dtoa() and az_span_atod().
  • Fix the SDK warnings for the release configurations.
  • Do not use a shared static scratch buffer for JSON token parsing. Instead use stack space.

Other Changes and Improvements

  • Refactor and update IoT samples.
  • Optimize the code size for URL encoding and setting HTTP query parameters.
  • Add support for building the SDK on ARM (Cortex M4) and adding it to CI.

1.0.0-preview.4 (2020-08-10)

New Features

  • Support for writing JSON to non-contiguous buffers.
  • Support for reading JSON from non-contiguous buffers.
  • Add support for national cloud auth URLs.

Breaking Changes

  • az_span.h:
    • az_span_init() is renamed to az_span_create().
    • az_span_from_str() is renamed to az_span_create_from_str().
    • Removed az_pair_from_str().
  • az_context:
    • key and value are const.
    • az_context_with_expiration() is renamed to az_context_create_with_expiration().
    • az_context_with_value() is renamed to az_context_create_with_value().
    • az_context_app is renamed to az_context_application.
  • az_credential_client_secret_init() now takes fourth parameter, authority.
  • az_http_policy_retry_options:
    • status_codes now should be terminated by AZ_HTTP_STATUS_CODE_END_OF_LIST.
    • max_retries is now int32_t instead of int16_t.
  • az_config.h:
    • AZ_HTTP_REQUEST_URL_BUF_SIZE renamed to AZ_HTTP_REQUEST_URL_BUFFER_SIZE.
    • AZ_HTTP_REQUEST_BODY_BUF_SIZE renamed to AZ_HTTP_REQUEST_BODY_BUFFER_SIZE.
    • AZ_LOG_MSG_BUF_SIZE renamed to AZ_LOG_MESSAGE_BUFFER_SIZE.
  • az_result:
    • AZ_ERROR_HTTP_PLATFORM renamed to AZ_ERROR_HTTP_ADAPTER.
    • AZ_ERROR_EOF renamed to AZ_ERROR_UNEXPECTED_END.
    • Removed AZ_CONTINUE.
  • az_storage_blobs_blob_client:
    • retry field renamed to retry_options in az_storage_blobs_blob_client_options.
    • Moved az_context* context parameter from az_storage_blobs_blob_upload() into a public field on az_storage_blobs_blob_upload_options.
  • az_json_writer:
    • az_json_writer_get_json() is renamed to az_json_writer_get_bytes_used_in_destination().

Bug Fixes

  • Remove support for non-finite double values while parsing/formatting.
  • Use custom, portable implementation of IEEE 754 compliant isfinite() since some embedded platforms don't have it.
  • Limit use of sscanf only to double parsing, using a custom implementation for {u}int{32|64} parsing because of incompatibility with sscanf format and the GCC newlib-nano implementation.

Other Changes and Improvements

  • Made az_http_request and related APIs to get URL, body, and headers, public.
  • Add and update IoT samples, including DPS.
  • Add samples for IoT Hub Plug and Play.

1.0.0-preview.3 (2020-07-20)

  • Updated az_result values:
    • Rename az_result value AZ_ERROR_PARSER_UNEXPECTED_CHAR to AZ_ERROR_UNEXPECTED_CHAR.
    • Remove unused az_result error codes: AZ_ERROR_JSON_STRING_END, AZ_ERROR_JSON_POINTER_TOKEN_END, and AZ_ERROR_MUTEX.
  • Add permutations of numeric type parsing and formatting APIs on span - ato[u|i][32|64], atod and the inverse [u|i][32|64]toa, dtoa.
  • Updates to the JSON APIs:
    • Rename JSON parser/builder APIs to reader/writer.
    • Add double parsing and formatting support to JSON reader and JSON writer.
    • Redesign JSON reader and JSON token APIs with lazy evaluation of tokens, proper unescaping support, and hardened validation.
  • Update samples, README docs along with deep dive video, and VSCode and CMake instructions.
    • Add PnP sample for Azure IoT Hub.
  • Add log classification for the IoT convenience layer.
  • Fixed SAS token generation by URL-encoding the components.
  • Rename the http response function az_http_response_write_span to az_http_response_append.
  • Add thread safety for client secret credential.
  • Transform apply_credential into an HTTP policy.
  • Default behavior for failed preconditions changed to infinite loop instead of thread sleep.

1.0.0-preview.2 (2020-05-18)

  • Update top-level CMakeLists.txt to only add subdirectory for specified platform.
  • Add compilation option to remove all logging from SDK code.

1.0.0-preview.1 (2020-05-12)

Initial release. Please see the README for more information.