1.22 TCP/IP WolfSSL TCP Server

Description

The TCP/IP WolfSSL TCP 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 WolfSSL TCP Server

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

wolfSSL component is added for secure connection which supports TLS.

wolfCrypt module enabled with MD5 and SHA authentication

FreeRTOS component is required for RTOS application. For bare-metal (non-RTOS) FreeRTOS component should not be selected.

TCP/IP Configuration - TCP/IP WolfSSL TCP 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

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

• Application Layer Modules
  • ANNOUNCE to discover the Microchip devices within a local network.
  • DHCP Client to discover the IPv4 address from the nearest DHCP Server.
  • DNS Client provides DNS resolution capabilities to the stack.
  • SNTP Simple Network Time Protocol updates its internal time periodically using a pool of public global time servers.

Downloading and Building the application

To clone or download this application from Github, go to the main page of this repository 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\wolfssl_tcp_server\firmware

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

Hardware Setup - PIC32CZ CA70 Curiosity Ultra

The target board for running the application is PIC32CZ CA70 Curiosity Ultra.

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

Board Setup

To set up the hardware, refer to the PIC32CZ CA70 Curiosity Ultra User's Guide.

• Default jumper setting of the board is shown above.
• Connect the micro USB cable between DEBUG USB port on the board and host PC.
• Establish a connection between the router/switch with the PIC32CZ CA70 Curiosity Ultra board through the RJ45 connector, using the Ethernet cable.

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 virtual COM port.
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.

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 Server Test

For TCP Server test, a TCP Client application is required to run on the host computer (SocketTest, PacketSender etc).

In this demonstration, we use SocketTest utility.

a. Clear text connection (Port 80):

• Send a TCP packet to the IP address of the hardware board, port 80, from TCP Client application (SocketTest) running on the computer.
• The TCP Server running on the hardware board will receive the message and prints on console ‘Received a clear text connection’. See the following screenshots.

b. Encrypted connection (Port 443):

• For encrypted mode, send a packet to port 443 in SSL mode from TCP Client application (SocketTest) running on the computer.
• The TCP Server running on the hardware board will receive the message and prints on console ‘Received a clear ssl connection’. See the below screenshots.