1.27.0

📈 Added

• General:

  • Add a reference software watchdog port for the STM32L4 series LPTIM
    peripheral. Users of the STM32 HAL can now compile in the reference port and
    the MemfaultWatchdog_Handler. The handler will save a coredump so the full
    system state can be recovered when a watchdog takes place. More details can
    be found in
    ports/include/memfault/ports/watchdog.h.

  • Add CLI commands wdg_enable, wdg_disable, and wdog_update <timeout_ms>
    for testing a software watchdog port. These commands are disabled by default
    and can be enabled for platforms using the minimal shell/console with
    MEMFAULT_DEMO_CLI_WATCHDOG.

• Zephyr:

  • Add a new Kconfig option, CONFIG_MEMFAULT_HTTP_MAX_MESSAGES_TO_SEND, which
    controls the max number of messages that will be sent in a single invocation
    of memfault_zephyr_port_post_data() or similar APIs. The default is 100,
    which is suitable for most applications. Before this change, the limit was
    hard coded to 5 messages, which was too low for systems with infrequent
    upload intervals.

  • Support building for native_sim on arm64 hosts (specifically, the
    native_sim/native/64 target), in addition to x86 hosts.

🛠️ Changed

• Zephyr:

  • Improve the default implementation of
    memfault_platform_sanitize_address_range() to include all memory
    accessible by the kernel. This enables collection of heap-allocated task
    control blocks, which was previously unsupported. Users with discontiguous
    memory regions should provide their own implementation, as before.

  • Prioritize the thread bookkeeping array when collecting thread information
    in a coredump (when CONFIG_MEMFAULT_COREDUMP_COLLECT_TASKS_REGIONS=y, the
    default). This improves the quality of the processed coredump if the
    coredump region is too small to collect all stacks for all threads in the
    system (impacts systems with many threads and limited coredump storage
    space).

  • Add a new Kconfig option, CONFIG_MEMFAULT_HTTP_PACKETIZER_BUFFER_SIZE,
    which controls the size of the intermediate buffer used when reading data
    from the underlying data source (coredump storage, log buffer, CDR, etc)
    when uploading data to Memfault via HTTP. The default size is 128 bytes, and
    1024 bytes on nRF91x series SOCs to better support modem trace CDR upload.
    Thanks to @DematteisGiacomo for submitting this in
    #92.

• ESP-IDF:

  • Handle deprecated Deep Sleep API calls for upcoming ESP-IDF v5.5 and v6.

  • Supporting building with the Memfault CLI commands disabled,
    CONFIG_MEMFAULT_CLI_ENABLED=n. Thanks to @finger563 for reporting this
    issue and providing a fix in
    #93 🎉!

🐛 Fixed

• Zephyr:

  • Fix an issue where the socket file descriptor can potentially be leaked when
    the connection terminated unexpectedly during an HTTP chunk upload. Thanks
    to @DematteisGiacomo for submitting this in
    #92.