IP over USB

This repository contains the STM32 embedded firmware demonstration of a virtual network with a single lwIP server (DNS, DHCP, HTTP) presented on the USB network adapter interface. It's meant to be a starting point for IP over USB applications (using CDC-NCM protocol) and a low-cost IP stack development platform.

There are two possible supported software configurations:

1. A bare-metal implementation using the lwIP native API.
2. An RTOS implementation using FreeRTOS and the lwIP netconn API.

How to use

1. Build and flash the image on an STM32F4DISCOVERY or a 32L476GDISCOVERY (easily portable to other STM32 targets)
2. Connect to PC via USB
3. Fix any driver issues, see below
4. Go to http://www.lwip.home

Features

• Using NCM implementation of USBDevice (double-buffered, efficient, simple API)
• lwIP 2.1.0 with additional dummy DHCP server for out of the box operation
• DNS server implementation allows domain name based access
• Reprogramming via USB supported by DFU interface (DFU standard implementation to reboot to ROM)
• FreeRTOS variant allows the choice of any lwIP APIs to be used by the application