ESP32-S3 Dual Interface Network Example

✨ Project Description

This project demonstrates how an ESP32-S3 can be configured to operate with both Wi-Fi and Ethernet network interfaces enabled simultaneously.

The example focuses on network interface coexistence, showing that an ESP32-S3 device does not need to choose between wired and wireless connectivity. Instead, both interfaces can be initialized and managed within the same firmware.

This project is presented as a reference example, not a complete application.

🧠 Motivation

In many embedded designs, Ethernet and Wi-Fi are treated as mutually exclusive options. This example challenges that assumption by showing a multi-interface networking model, where:

• Wi-Fi and Ethernet can coexist
• Network flexibility is increased
• Application logic is decoupled from transport choice

This approach is useful for modern embedded and edge devices that require resilience, flexibility, or multiple access paths.

🧩 Hardware Environment

💻 Software Environment

ESP-IDF framework

• ESP32-S3 networking stack
• Multiple network interfaces enabled in the same application

The example focuses on:

• Network interface initialization
• Interface coexistence
• Runtime network configuration

It does not include application-layer protocols such as HTTP, MQTT, or cloud services.

⚙️ Key Features

✅ Dual Interface Support: WiFi and Ethernet work simultaneously
✅ Automatic Failover: Prefers Ethernet when available, falls back to WiFi
✅ Non-blocking Connection: Both interfaces connect asynchronously
✅ Clean API: Simple functions to check status and get IP addresses
✅ Production Ready: Proper error handling and logging
✅ Fully Documented: Every configuration option explained

🛠️ What This Project Demonstrates

• How ESP32-S3 handles multiple active network interfaces
• How W5500 can be introduced without removing Wi-Fi support
• A reusable architectural pattern for dual-interface embedded systems
• How ESP-IDF abstracts network interfaces at a system level

For WIZnet users, this example helps clarify where SPI-based Ethernet devices fit within ESP32 designs that already include Wi-Fi.

🎯 Use Cases

• Hybrid Ethernet + Wi-Fi embedded devices
• Ethernet-first edge devices with wireless configuration
• Prototyping dual-network designs on ESP32-S3
• Reference for ESP32-S3 + W5500 integration projects

📌 Summary

This project provides a clear example of dual-interface networking on ESP32-S3 and W5500, showing how Wi-Fi and Ethernet can coexist within a single embedded system. Its value lies in demonstrating a flexible network architecture rather than a specific hardware or protocol implementation.