39.2. lwip_tcpecho

39.2.1. Overview

This example shows TCP echo communication.

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

39.2.2. 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

39.2.3. 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

39.2.4. Run Example

  • Compiling and Downloading

  • Running log is shown in the serial terminal as follows:

    This is a TSW 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

      img

    • Watch the characters echoed from MCU

      img