OSS + ELC EU 2026

PX4 v1.18 introduces a serialpassthrough driver that lets any MAVLink client read from and write to flight controller serial ports. This talk walks through the design: how SERIAL_CONTROL messages are mapped to hardware UART ports and, on STM32F7/H7 boards, to ESC signal pins via a software bit-bang UART; How reply routing, buffer management, and channel exclusivity are handled. We also cover the MAVLink↔UART bridge pattern that makes the feature usable from standard host-side tools, and the PASSTHRU_EN mechanism for safely handing off ESC signal pins at boot. Whether you need to debug a serial peripheral over a telemetry link, configure an ESC remotely, or build custom tooling on top of SERIAL_CONTROL, this talk gives you the full picture.