# Split, Send, Reassemble: A Formal Specification of a CAN Bus Protocol Stack

## TL;DR

This paper introduces a formal model for a fragmentation and reassembly protocol on the CAN bus, addressing limitations in prioritization mechanisms to improve reliability in automotive and aerospace systems.

## Contribution

The paper presents a novel formal specification of a fragmentation and reassembly protocol that enhances CAN bus communication beyond existing prioritization features.

## Key findings

- Formal model of fragmentation and reassembly protocol
- Addresses limitations of CAN bus prioritization
- Applicable to automotive and aerospace systems

## Abstract

We present a formal model for a fragmentation and a reassembly protocol running on top of the standardised CAN bus, which is widely used in automotive and aerospace applications. Although the CAN bus comes with an in-built mechanism for prioritisation, we argue that this is not sufficient and provide another protocol to overcome this shortcoming.