In December 2024, Ilja Friedel focused on enhancing cross-platform compatibility for the mbedtls_net_usleep function in both the Mbed-TLS/mbedtls-framework and zephyrproject-rtos/mbedtls repositories. Using C and cross-compilation techniques, Ilja addressed DJGPP/MS-DOS-specific build and runtime issues by ensuring correct tv_usec population and introducing alternate code paths where suseconds_t was unavailable. These changes prevented compilation failures and incorrect sleep behavior on DJGPP platforms, improving reliability for embedded systems. Ilja also updated and synchronized documentation and changelogs across both repositories, demonstrating a thorough approach to bug fixing, cross-platform development, and maintaining robust, portable codebases.