20.13. lwip_tcpecho

20.13.1. Overview

This example shows TCP echo communication.

PC sends TCP data frames to MCU, and then MCU sends the data frames back to PC

20.13.2. 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

20.13.3. Project Configurations

Ethernet Port Settings: Refer to Ethernet common project settings
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

20.13.4. Run Example

Compiling and Downloading

Running log is shown in the serial terminal as follows:

This is an ethernet demo: TCP Echo (Polling Usage)
LwIP Version: 2.1.2
Enet phy init passed !
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
- create and set a TCP client: TCP Server IP: 192.168.100.10/Port: 5001
  
  Note: There is a necessary adjustment for Server IP according to the segment of LAN where PC resides
- Connect
- Enter and send any characters in the edit window
- Watch the characters echoed from MCU