Lower is better for all metrics.
__attribute__((aligned(4))) const uint8_t device_desc[] = ... ; Symptom : Log shows MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE . Cause : Patch 8 enforces TLS 1.2 minimum; older servers using TLS 1.0 fail. Fix : In mqtt_config.h , set: ctr-sdk-4-2-8
export CTR_SDK_ROOT=/opt/ctr-sdk-4-2-8 export PATH=$CTR_SDK_ROOT/tools/bin:$PATH export CTR_TARGET=cortex-m4 ctr-cli --version Expected output: Lower is better for all metrics
cd /path/to/old/project $CTR_SDK_ROOT/tools/migrate_to_4_2_8.py --src . --dst ./migrated Review the generated migration_report.txt for manual fix suggestions. We ran benchmarks on a STM32F407 (Cortex-M4, 168 MHz) comparing ctr-sdk-4-2-8 against v4.0.5 and v3.6.2. Cause : Patch 8 enforces TLS 1
CTR SDK Command Line Interface (CLI) Version: 4.2.8 Build: Oct 12 2024 cd $CTR_SDK_ROOT/examples/blinky mkdir build && cd build cmake .. -DCMAKE_TOOLCHAIN_FILE=$CTR_SDK_ROOT/cmake/arm-gcc-toolchain.cmake make -j4 If successful, you will see blinky.hex and blinky.elf in the build folder. Common Use Cases for CTR-SDK-4-2-8 The flexibility of ctr-sdk-4-2-8 makes it suitable for a wide range of embedded applications: