14.18. lwip_tcpecho_multi_ports_rtthread-nano

14.18.1. Overview

This example shows TCP echo communication on multiple ports on RTThread-Nano.

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

14.18.2. Board Settings

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

• Connect two Ethernet ports on PC to a RGMII port and a RMII port on the development board with two Ethernet cables

14.18.3. 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

14.18.4. Run Example

• Compiling and Downloading

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

  This is an ethernet demo: TCP Echo With Multi Ports On RTThread-Nano
  LwIP Version: 2.1.2
  Enet1 Reference Clock: Internal Clock
  
   \ | /
  - RT -     Thread Operating System
   / | \     3.1.5 build Mar 18 2024
   2006 - 2020 Copyright by rt-thread team
  msh >Enet0 init passed!
  Enet1 init passed!
  ================ Network Interface 1 ================
  Link Status: Down
  ================ Network Interface 1 ================
  Link Status: Up
  Link Speed:  100Mbps
  Link Duplex: Full duplex
  ================ Network Interface 1 ================
  IPv4 Address: 192.168.200.10
  IPv4 Netmask: 255.255.255.0
  IPv4 Gateway: 192.168.200.1
  ================ Network Interface 0 ================
  Link Status: Down
  ================ Network Interface 0 ================
  Link Status: Up
  Link Speed:  1000Mbps
  Link Duplex: Full duplex
  ================ Network Interface 0 ================
  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 two TCP clients: TCP Server 0 IP: 192.168.100.10/Port: 5001 TCP Server 1 IP: 192.168.200.10/Port: 5002

    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(192.168.100.10/5001)

    

  • Watch the characters echoed from MCU window(192.168.100.10/5001)

    

  • Enter and send any characters in the edit window(192.168.200.10/5002)

    

  • Watch the characters echoed from MCU window(192.168.200.10/5002)