Defines how to read/write data, manage diagnostic sessions, control routines, and perform ECU programming (flashing). ISO 14229-1 on GitHub (2025-2026 Context)

| Repo | Language | Why interesting | |------|----------|------------------| | pyvit | Python | UDS over CAN + ISO-TP. Super clean. See uds.py | | uds-c | C | Embedded-ready, used in Ford OpenXC | | python-uds | Python | Most complete SID handling, CLI tool included | | udsoncan | Python | Actively maintained, great for scripting ECU tests |

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Python is the preferred language for diagnostic scripting. Many libraries on GitHub provide a common API across diagnostic buses (CAN, Ethernet, LIN, FlexRay, K-Line).