The Controller Area Network (CAN) remains one of the most reliable communication technologies in embedded systems, industrial automation, commercial vehicles, marine electronics, and robotics. At the same time, Ethernet has become the preferred medium for connecting systems over long distances, integrating with cloud services, and providing remote access.

Bridging these two worlds is a common requirement in modern applications. Whether you need to monitor CAN traffic from a remote workstation, connect multiple CAN networks across a building, or collect data for Industrial IoT applications, a Raspberry Pi equipped with a PiCAN interface provides an inexpensive yet remarkably powerful CAN-to-Ethernet gateway.

In this article, we'll examine the concept, implementation, and practical applications of a Raspberry Pi CAN-to-Ethernet gateway and explain why the PiCAN product family from Copperhill Technologies is an excellent foundation for such projects.

Why Bridge CAN and Ethernet?

CAN Bus was designed for deterministic, real-time communication between electronic control units (ECUs). Ethernet, on the other hand, excels at transporting data over large networks and integrating with existing IT infrastructure.

A gateway allows both networks to perform what they do best.

Typical reasons include:

• Remote CAN Bus monitoring

• Data logging over a LAN

• Industrial IoT connectivity

• Cloud integration

• Remote diagnostics

• Multi-building machine monitoring

• Vehicle fleet data collection

• Marine electronics networking

• CAN network simulation and testing

Instead of connecting a PC directly to the CAN Bus with a USB adapter, the Raspberry Pi becomes an intelligent network appliance that can be installed anywhere Ethernet is available.

Basic Gateway Architecture

A typical installation looks like this:

           Ethernet Network
                  |
          +----------------+
          | Raspberry Pi   |
          |                |
          | SocketCAN      |
          | Gateway App    |
          +----------------+
                  |
             PiCAN HAT
                  |
             CAN Bus Network
                  |
      ECUs • Sensors • Controllers

The Raspberry Pi continuously exchanges CAN messages with the field network while communicating with remote computers over Ethernet using TCP/IP, UDP, MQTT, HTTP, WebSockets, or custom protocols.

Unlike a simple USB-CAN adapter, the Raspberry Pi can preprocess, filter, timestamp, log, or even modify traffic before forwarding it.

Why Raspberry Pi?

The Raspberry Pi has become one of the most popular embedded Linux platforms available.

Advantages include:

• Quad-core processor

• Built-in Ethernet

• Linux operating system

• Gigabytes of RAM

• Massive software ecosystem

• Low power consumption

• Excellent reliability

• Very affordable

Because Raspberry Pi runs Linux, developers gain access to powerful networking tools that are difficult to implement on traditional microcontrollers.

Enter the PiCAN Product Family

Copperhill Technologies offers the PiCAN series of Raspberry Pi CAN interface boards specifically designed for professional CAN development and deployment. The PiCAN family supports SocketCAN, the standard Linux CAN networking framework, allowing CAN interfaces to appear just like network interfaces under Linux. 

The product line includes numerous options to match different applications:

• Classical CAN

• CAN FD

• Single-channel interfaces

• Dual-channel interfaces

• GPS-equipped versions

• Real-Time Clock (RTC)

• Isolated models

• NMEA 2000 interfaces

• LIN Bus support on selected models

This flexibility allows developers to build anything from a simple CAN monitor to sophisticated industrial gateways.

SocketCAN Makes Everything Easy

One of Linux's greatest strengths is SocketCAN.

Instead of using proprietary APIs, CAN interfaces become standard Linux network devices.

Typical commands include:

ip link set can0 up type can bitrate 500000

Monitoring traffic:

candump can0

Sending a frame:

cansend can0 123#1122334455667788

Because SocketCAN integrates directly into the Linux networking stack, developers can use numerous existing libraries and applications without writing low-level drivers. Tools such as can-utils, Wireshark, and python-can work seamlessly with PiCAN hardware. (Copperhill Technologies)

Gateway Software Possibilities

Once CAN frames are available through SocketCAN, almost any networking protocol can be used.

Examples include:

TCP Server

The Raspberry Pi accepts TCP client connections and streams CAN frames.

Ideal for:

• Windows applications

• Laboratory equipment

• Custom engineering software

UDP Broadcast

Useful for:

• Fast monitoring

• Multiple simultaneous clients

• Low-overhead communication

MQTT

Excellent for Industry 4.0 applications.

The gateway publishes CAN messages to an MQTT broker where cloud applications, dashboards, or data historians subscribe.

HTTP REST API

Applications can request:

• Current sensor values

• Device status

• Historical information

• Diagnostics

This is ideal for web dashboards.

WebSockets

Perfect for browser-based CAN monitoring software requiring real-time updates.

Intelligent Data Processing

One advantage of using Linux instead of a small microcontroller is the ability to perform sophisticated processing before transmitting data.

Examples include:

Message Filtering

Only forward selected CAN identifiers.

Example:

• Engine speed

• Vehicle speed

• Oil pressure

instead of the entire network.

Protocol Decoding

Instead of forwarding raw CAN frames:

18F00400
FF 00 5A 01 ...

the gateway can decode them into engineering values:

Engine Speed: 1850 RPM
Oil Pressure: 64 PSI
Coolant Temperature: 91°C

This dramatically reduces processing requirements on client software.

Data Aggregation

Rather than sending thousands of CAN frames every second, the gateway can periodically publish summarized information.

For example:

{
 EngineSpeed: 1852
 FuelRate: 18.6
 VehicleSpeed: 42.8
}

This reduces Ethernet bandwidth while simplifying application development.

Dual CAN Gateway Applications

The PiCAN Duo models open even more possibilities by providing two independent CAN channels.

Applications include:

• Bridging two CAN networks

• Protocol translation

• CAN filtering

• Baud rate conversion

• Vehicle network isolation

• Test bench simulation

A Raspberry Pi can receive messages on one CAN network, process them, and transmit selected information onto another network.

Industrial IoT Applications

Many industrial systems still rely heavily on CAN.

Adding Ethernet connectivity enables:

• Factory monitoring

• Predictive maintenance

• Energy monitoring

• Equipment diagnostics

• Cloud dashboards

• Historical data collection

Because Linux supports databases such as SQLite, PostgreSQL, or InfluxDB, the Raspberry Pi can store extensive historical CAN data before forwarding it elsewhere.

Remote Diagnostics

One particularly useful application is remote troubleshooting.

Instead of sending a technician to the machine:

• Install Raspberry Pi

• Connect to CAN Bus

• Connect Ethernet

• Access remotely

Authorized users can monitor live CAN traffic, retrieve logs, update software, or diagnose communication issues from virtually anywhere on the network.

Marine Applications

The PiCAN-M models support NMEA 2000, making them suitable for marine applications where vessel data needs to be integrated with onboard Ethernet networks.

Typical applications include:

• Navigation systems

• Engine monitoring

• Fuel management

• Environmental sensors

• Remote vessel monitoring

Software Development

Because Raspberry Pi supports multiple programming languages, developers can choose the environment they know best.

Popular choices include:

• Python

• C/C++

• Node.js

• Go

• Rust

Combined with SocketCAN, developing a complete CAN gateway often requires surprisingly little code.

Future Expansion

One of the Raspberry Pi's biggest strengths is its flexibility.

A gateway can later be expanded with:

• GPS positioning

• Wi-Fi

• Cellular connectivity

• Bluetooth

• Local web server

• Database logging

• Secure VPN access

• Docker containers

• AI-based analytics

The hardware platform remains the same while software capabilities continue to grow.

Conclusion

A Raspberry Pi equipped with a PiCAN interface offers far more than a simple CAN adapter. It becomes a powerful embedded gateway capable of connecting real-time CAN networks to modern Ethernet infrastructures while leveraging the extensive Linux software ecosystem.

Whether you're building an industrial data logger, a remote diagnostics platform, an automotive development tool, or an IIoT edge device, the combination of Raspberry Pi, SocketCAN, and the PiCAN product family from Copperhill Technologies provides a flexible, scalable, and cost-effective solution. With support for Classical CAN, CAN FD, dual-channel interfaces, GPS, NMEA 2000, and other specialized configurations, the PiCAN lineup allows developers to tailor the hardware to the needs of virtually any CAN-to-Ethernet application.

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