# lwip_udpecho_freertos

## Overview

This  example shows UDP echo communication on FreeRTOS.

- PC sends UDP data frames to MCU,  and then MCU sends the data frames back to PC

## Board Settings

- Connect a USB port on PC to the PWR DEBUG port on the development board with a USB Type-C cable
- Connect an Ethernet port on PC to a RGMII port or a RMII port on the development board with an Ethernet cable

## Project Configurations

- Ethernet Port Settings: Refer to [Ethernet common project settings](../doc/Ethernet_Common_Project_Settings_en.md)
- Ethernet DHCP Configurations
  - the configurations in the `CMakeLists.txt` as follows:
    - sdk_compile_definitions(-DLWIP_DHCP=0): Disable DHCP feature
    - sdk_compile_definitions(-DLWIP_DHCP=1): Enable DHCP feature

## Run Example

- Compiling and Downloading
- Running log is shown in the serial terminal as follows:

  ```console
  This is an ethernet demo: UDP Echo On FreeRTOS
  LwIP Version: 2.1.2
  Enet phy init passed !
  Link Status: Down
  Link Status: Up
  Link Speed:  1000Mbps
  Link Duplex: Full duplex
  IPv4 Address: 192.168.100.10
  IPv4 Netmask: 255.255.255.0
  IPv4 Gateway: 192.168.100.1
  ```
- Run an Ethernet debugging tool

  - Select the protocol type: UDP
  - Select the local host address and port
  - Open
  - Select the remote host address and port
  - Enter and send any characters in the edit window
  - Watch the characters echoed from MCU

    ![img](doc/lwip_udpecho_freertos.png)