What is CAN bus? 

The Controller Area Network (CAN) bus is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other without a host computer. It was developed by Bosch in the 1980s and is widely used in automotive and industrial applications for real-time communication.

### Key Features:

1. **Multi-Master Capability**: Any node can initiate communication if the bus is free.

2. **Error Detection**: Built-in mechanisms to detect and handle errors ensure reliable data transmission.

3. **Message Priority**: Messages are assigned priorities, and higher priority messages gain bus access first.

4. **Speed**: Supports data rates up to 1 Mbps.

5. **Efficiency**: Uses a non-destructive bitwise arbitration method, which means the highest priority message always gets through without delay.