Mbed TLS

Adds support for mbedtls v2.26.0.

NB: User must provide an mbedtls configuration file. It can be an empty file or override MbedTLS default configurations.

The configuration file specified by the application is retrieved by adding the C macro MBEDTLS_CONFIG_FILE=<filename> to the mbedtls-config target and its include path.

Example:

target_include_directories(mbedtls-config
    INTERFACE
        mbedtls-config
)

target_compile_definitions(mbedtls-config
    INTERFACE
        MBEDTLS_CONFIG_FILE="mbedtls_config.h"
)

CMSIS RTOS threading support

To enable the CMSIS RTOS threading protection #define MBEDTLS_THREADING_ALT should be present in the user provided mbedtls configuration file.

The library mbedtls-threading-cmsis-rtos should be linked to the mbedtls-config library. The application must call mbedtls_threading_set_cmsis_rtos() to enable the multi threading protection.