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Google Cloud IoT Core Device SDK for Embedded C version 1.0.3

April 28, 2021

  • Updated the POSIX BSP to use open instead of fopen for more consistent error detection, #100 by @pnfisher.
  • Fixed a non null-terminated issue in message.topic with ‘iotc_user_subscription_callback_’, #111 by @csobrinho.
  • Added overflow protection to ‘__iotc_calloc()’ calls, #119
  • Updates to the Zephyr Troubleshooting guide, #104 by @galz10.
  • Fixes to links within the User Guide, #102 by @mikevoyt.
  • Thank you to all of our contributors!

Google Cloud IoT Core Device SDK for Embedded C version 1.0.2

February 4, 2020

  • Wildcard topic name support in MQTT subscriptions, #89 by @sheindel, thank you!
  • Documentation overhaul, see Device SDK API and BSP references.
  • Zephyr integration fixes, using Zephyr v1.14.0.
  • Improvements on the 'make' build system (wolfssl fixes, addressing rebuild issues).

Google Cloud IoT Core Device SDK for Embedded C version 1.0.1

April 8, 2019

  • The TLS Board Support Package (BSP) reference implementation for mbedTLS has been updated to use deterministic ECDSA signatures.

  • iotc_get_state_string may now be used to query error strings for application debugging. See include/iotc_error.h to enable this feature.

  • Updated the gtest framework compilation standard to c++14. This does not affect the IoT Device SDK library sources.

  • Documentation:

    • Updates to the Device SDK API and BSP doxygen documentation.
    • README.md formatting updates.
    • CONTRIBUTING.md includes a new pull request processes and a link to the Google style guidelines.

  • Networking BSP:

    • Added UDP and IPv6 support.
    • Removed the function iotc_bsp_io_net_create_socket. Sockets should now be created in BSP implementations of iotc_bsp_iot_net_socket_connect.
    • See include/bsp/iotc_bsp_io_net.h for more information about these changes.
    • Removed src/bsp/platform/posix/iotc_bsp_hton.h as it was no longer required.

  • Time API:

    • The iotc_time_t typedef is now defined as an int64_t.
    • Added the function iotc_bsp_time_getmonotonictime_milliseconds.
    • See include/bsp/iotc_time.h for more information about these changes.

Google Cloud IoT Core Device SDK for Embedded C version 1.0

February 22, 2019

  • Added FreeRTOS example. See examples/freertos_linux/Linux_gcc_gcp_iot/README.md for more information.

  • Added Zephyr example. See examples/zephyr_native_posix/README.md for more information.

  • Added ATECC608 Secure Element reference implementation for generating JWT signatures with private keys. See src/bsp/crypto/cryptoauthlib/iotc_bsp_crypto_cryptoauthlib.c for more information.

  • Connection API Changes:

    • JWT creation and formation was added to a new header file include/iotc_jwt.h.
    • iotc_connect and iotc_connect_to now take the standard MQTT connect credentials of username, password, and client_id. A JWT, formatted according to Cloud IoT Core specifications, should be passed as the MQTT password when connecting to Cloud IoT Core.
    • For more information, see the Device SDK API or BSP reference.

Google Cloud IoT Core Device SDK for Embedded C version 0.7

October 1, 2018

The initial release of the Cloud IoT Core Device SDK for Embedded C. The SDK connects embedded devices to Google Cloud IoT Core via MQTT.

The SDK uses a Board Support Package (BSP) architecture to compartmentalize device-specific code. This modular approach aids in the porting process. Engineers only need to customize a few files to port the Device SDK to their device. A reference BSP implementation is provided for POSIX systems and two reference TLS implementations are provided for use with either the mbedTLS or wolfSSL embedded libraries. TLS implementations are required for both TLS connectivity and for private-key JWT signatures. JWTs serve as client authentication tokens when connecting to Google Clout IoT Core.

For more documentation on the process of porting the SDK to your embedded device, or for using another TLS library, please see the README.md and the /doc/porting_guide.md documents. For more information about Google Cloud IoT Core, please visit: https://cloud.google.com/iot-core.

The Device SDK is developed on Ubuntu Linux with GNU Make.