# RNDIS Device - UDP Echo

## Overview

This example project shows USB RNDIS device implement UDP Echo

- PC sees a network interface via Device Manager, the MAC address is 20:89:84:6A:96:AA.
- Application program using lwip stack create a virtual network interface, the MAC address is 20:89:84:6A:96:00. DHCP, DNS and UDP servers are implemented. The PC enumerated network interface can communicate with virtual network interface through UDP protocol.

## Board Setting

- Connect a USB port on PC to the PWR DEBUG port on the development board with a USB Type-C cable
- Connect a USB port on PC to one of USB port on the development board with a USB Type-C cable

## Running the example

- Download the program and run. The computer will enumerate a network interface device with the following attributes:
![ethernet_property.png](../doc/ethernet_property.png)

- Open the network debugging assistant and set it as follows (the IP address of the remote host is 192.168.7.1, and the port is 5001). Enter the string and click Send. The remote host will return the received string and output "This is reply!"
![udp_echo.png](doc/udp_echo.png)

- At the same time, you can also observe the serial console output, and the corresponding output is as follows:
```console

Udp_server get a data:
hpmicro test rndis udp echo.
This is reply!
Udp_server get a data:
hpmicro test rndis udp echo.
This is reply!

```