Version: 0.1.1 (or your current version) Author: Kostovite (minhhieudo2545@gmail.com) License: MIT License (Assuming you chose MIT, adjust if different)

This Arduino library provides a foundational implementation of the ISO 15765-2 (ISO-TP) transport protocol layer, designed to run on ESP32 microcontrollers using their built-in TWAI (CAN) peripheral. It enables the sending and receiving of multi-frame CAN messages, which is essential for many OBD-II diagnostic services (like reading VIN, DTCs) and other CAN-based communication protocols that exceed the standard 8-byte CAN frame payload.

This library handles the segmentation, reassembly, and basic flow control aspects of ISO-TP.

• Supports sending and receiving ISO-TP messages (Single Frame, First Frame, Consecutive Frame, Flow Control).
• Designed for use with the ESP32's native TWAI (CAN) controller.
• Configurable Flow Control parameters (Block Size, STmin) for frames sent by the ESP32.
• Handles basic ISO-TP timing parameters (N_Bs, N_Cr, and a general activity timeout).
• Allows custom CAN frame padding byte.
• Provides a simple API for integrating into OBD-II readers or other ISO-TP applications.

• Arduino IDE (1.8.13 or newer recommended).
• ESP32 Board Support Package installed in the Arduino IDE.
• An ESP32 development board (e.g., ESP32-WROOM-DA, ESP32 Dev Module).
• A CAN Transceiver module (e.g., Waveshare SN65HVD230, MCP2551 based boards).

This library was tested using an ESP32 and a Waveshare SN65HVD230 CAN transceiver module.

Connections (ESP32 powered via USB or onboard sources):

1. ESP32 to CAN Transceiver (SN65HVD230):

   • ESP32 GPIO for CAN_TX (e.g., GPIO22) -> CAN TX
   • ESP32 GPIO for CAN_RX (e.g., GPIO21) -> CAN RX
   • ESP32 3V3 -> Transceiver 3.3V VCC
   • ESP32 GND -> Transceiver GND

2. CAN Transceiver to OBD-II Port (or other CAN bus):

   • Transceiver CANH -> OBD-II Pin 6 (CAN High)
   • Transceiver CANL -> OBD-II Pin 14 (CAN Low)*