How does STM32 communicate with GUI Tools through SLCAN of Ardupilot？ What basic protocols are required?
Generally, questions about ArduPilot are better asked on the ArduPilot forum, but I can help here. The answer to your question is embedded in the question itself: SLCAN (sometimes referred to as LAWICEL protocol) is the protocol you are looking for. There is no formal specification but a reasonably common subset is described here:
Thanks, I wil try.