Tero Salminen enhanced hardware validation for the tiiuae/px4-firmware repository by developing an advanced UART loopback test supporting chained configurations of up to three UART devices. He refactored the existing loopback framework in C++ to enable multi-UART chaining, introducing a new chain_loopback command and improving the system’s flexibility. Tero also implemented a set_port command, allowing dynamic configuration of UART ports to 115200 baud, which streamlines debugging and test coverage. His work demonstrated depth in driver development, embedded systems, and system programming, addressing the need for more robust UART-based verification without introducing bug fixes during the development period.