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# 1.2 TCP/IP TCP and UDP Client Server

This application creates Client/Server sockets for TCP/UDP protocol, with application commands.

## Description

The TCP/IP TCP and UDP Client Server application is based on MPLAB® Harmony 3 TCP/IP Stack.

The Harmony TCP/IP stack is a collection of different network protocols.

The source files of Harmony 3 TCP/IP stack is available here.

The demo is created with MPLAB X IDE and MCC plugin.

MCC Project Graph - TCP/IP TCP and UDP Client Server

The following Project Graph shows the Harmony components included in the TCP/IP TCP and UDP Client Server demo application.

Figure 1-4.Project Graph

FreeRTOS component is required for RTOS application.

TCP/IP Configuration - TCP/IP TCP and UDP Client Server

The TCP/IP modules enabled for the demo is shown in the TCP/IP Configuration Overview

More details of TCP/IP Configuration plugin is available here

Figure 1-5.TCP/IP Configuration

The Application Layer modules enabled in the demo are as follows:

- Application Layer Modules
  - DHCP Client to discover the IPv4 address from the nearest DHCP Server.
  - DNS Client provides DNS resolution capabilities to the stack.

## Downloading and Building the application

To clone or download this application from Github, go to the repository and search for this device and then click Clone button to clone this repository or download as zip file.

This content can also be downloaded using content manager by following these instructions.

Path of the application within the repository is apps\tcpip_client_server\firmware .

To build the application, refer to the following list of demo configurations and open the project using MPLAB X IDE.

Table 1-3.Demo Configurations
Project Name | Target Device | Development Board | Description
--- | --- | --- | ---
pic32cx_sg41_cult_freertos.X | PIC32CX1025SG41128 | PIC32CX SG41 Curiosity Ultra | TCP/IP TCP and UDP Client Server with LAN8740 PHY daughter board - FreeRTOS

## Hardware Setup

The target board for running the application is PIC32CX SG41 Curiosity Ultra.

This section provides essential hardware configuration of this target board to run TCP/IP applications.

Figure 1-6.PIC32CX SG41 Curiosity Ultra Evaluation Board

Board Setup

To set up the hardware, refer to the section Board Setup in PIC32CX SG41 Curiosity Ultra User Guide.

- Connect the micro USB cable from the computer to the DEBUG USB connector on the PIC32CX SG41 Curiosity Ultra Evaluation Board.
- Establish a connection between the router/switch with the PIC32CX SG41 Curiosity Ultra Evaluation Board through the RJ45 connector.

## Running the Application

1. Open a terminal application on the host computer (like Hyper-terminal or Tera Term).
2. Configure the terminal application for serial port connected to USB debug port of the board.
3. Set baud rate as 115200 in the terminal application.
4. Build and download the application project on the target board.
5. Verify the TCP/IP Stack initialization console messages.

GMAC - Console Start up

If DHCP client is enabled in the demonstration, wait for the DHCP server to assign an IP address for the development board.

This will be printed on the console. Otherwise, the default static IP address will be assigned to the board.

By entering the command netinfo, the response is obtained as shown above.

TCP and UDP Client Server Test

The application can create 4 separate connections, each one running in its own thread:

- TCP client connection
- TCP server connection
- UDP client connection
- UDP server connection

Each connection has its own set of commands.

Commands can open or close the sockets, send messages from socket, display the received messages, configure the sockets etc.

help command will display the available application commands.