ISO 17356-3 (officially titled "Road vehicles — Open interface for embedded automotive applications — Part 3: OSEK/VDX Operating System (OS)") is a foundational standard for real-time operating systems (RTOS) in the automotive industry. Last confirmed in 2020, this version remains the current industry benchmark for standardized automotive OS APIs. ISO - International Organization for Standardization Core Technical Content
: Specifications for binding OS, Communication (COM), and Network Management (NM). Part 3 : The OSEK/VDX Operating System. Part 4 & 5 : Communication and Network Management protocols. iso 17356-3 pdf
Lower numbers usually mean lower priority (0 is the lowest). ISO 17356-3 (officially titled "Road vehicles — Open