19.16. lwip_tcpecho_multi_ports

19.16.1. Overview

This example shows TCP echo communication on multiple ports.

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

19.16.2. 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

19.16.3. 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

19.16.4. Run Example

Compiling and Downloading

Running log is shown in the serial terminal as follows:

This is an ethernet demo: TCP Echo On Multiple Ports (Polling Usage)
LwIP Version: 2.1.2
Enet1 Reference Clock: Internal Clock
Enet0 init passed!
Enet1 init passed!
================ Network Interface 0 ================
Static IP Information
IPv4 Address: 192.168.100.10
IPv4 Netmask: 255.255.255.0
IPv4 Gateway: 192.168.100.1
================ Network Interface 1 ================
Static IP Information
IPv4 Address: 192.168.200.10
IPv4 Netmask: 255.255.255.0
IPv4 Gateway: 192.168.200.1
================ Network Interface 1 ================
Link Status: Up
Link Speed:  100Mbps
Link Duplex: Full duplex
================ Network Interface 0 ================
Link Status: Up
Link Speed:  1000Mbps
Link Duplex: Full duplex

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)