# lwip_tcpclient
## Overview

This example shows the usage of TCP client.

- MCU as TCP client sends data frame periodically to a TCP server.

## 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: TCP Client (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
  Connect to server successfully!
  ```
- Run an Ethernet debugging tool

  - Create and set a TCP Server:  TCP Server IP: 192.168.100.5/Port: 5001

  - Open

  - Watch the data frame in the receive window
    <img src=../doc/lwip_tcpclient.png align=left>