1.16 TCP/IP WolfSSL TCP Client
This application creates a TCP client with MPLAB Harmony TCP API and establishes a TCP/IP connection to a Web server. The connection can either be clear text, or encrypted connection with wolfSSL.
Description
The TCP/IP WolfSSL TCP Client 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 Client
The following Project Graph shows the Harmony components included in the TCP/IP WolfSSL TCP Client demo application.
FreeRTOS component is required for RTOS application. For bare-metal (non-RTOS) FreeRTOS component should not be selected.
wolfSSL component is added for secure connection which supports TLS.
wolfCrypt module enabled with MD5 and SHA authentication
TCP/IP Configuration - TCP/IP WolfSSL TCP Client
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 Ethernet interface in this demo-configuration use GMAC0 with Onboard Gigabit Ethernet PHY Transceiver LAN8840.
The Ethernet interface in this demo-configuration use GMAC1 with External Gigabit Ethernet PHY Transceiver LAN8840.
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_client\ .
To build the application, refer to the following list of demo configurations and open the project using MPLAB X IDE.
| Project Name | Target Device | Development Board | Description |
|---|---|---|---|
| sam_a7d65_curiosity_gmac0.X | SAMA7D65 | SAMA7D65-Curiosity | TCP/IP WolfSSL TCP Client - Onboard Gigabit Ethernet PHY LAN8840 - Bare Metal |
| sam_a7d65_curiosity_gmac0_freertos.X | SAMA7D65 | SAMA7D65-Curiosity | TCP/IP WolfSSL TCP Client - Onboard Gigabit Ethernet PHY LAN8840 - FreeRTOS |
| sam_a7d65_curiosity_gmac1.X | SAMA7D65 | SAMA7D65-Curiosity+ LAN8840 EDS2 Daughter Card | TCP/IP WolfSSL TCP Client - External Gigabit Ethernet PHY LAN8840 - Bare Metal |
| sam_a7d65_curiosity_gmac1_freertos.X | SAMA7D65 | SAMA7D65-Curiosity+ LAN8840 EDS2 Daughter Card | TCP/IP WolfSSL TCP Client - External Gigabit Ethernet PHY LAN8840 - FreeRTOS |
Hardware Setup - SAMA7D65-Curiosity
The target board for running the application is SAMA7D65-Curiosity.
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 section Board Setup in SAMA7D65-Curiosity Kit User Guide.
- Default jumper setting of the board is shown above.
- Connect the USB Type-C cable between USB-A port on the board and host PC. This will supply power to the board.
- Connect a USB-UART converter for console output between the UART DEBUG port on the board and host PC.
- Connect the debugger/programmer between JTAG connector on the board and host PC.
- For GMAC0 application demos, connect Ethernet cable between RJ45 connector of Onboard Gigabit Ethernet PHY LAN8840 and router/switch/computer.
- For GMAC1 application demos, connect Ethernet cable between RJ45 connector of External Gigabit Ethernet PHY LAN8840 (through SODIMM add-on slot) and router/switch/computer.
Setting up at91bootstrap loader
To load the application binary onto the target device, we need to use at91bootstrap loader.
Refer to the at91bootstrap loader documentation for details on how to configure and run/debug the application using MPLABX and booting application using an SD Card.
Running the Application
- Open a terminal application on the host computer (like Hyper-terminal or Tera Term).
- Configure the terminal application for serial port connected to UART DEBUG port.
- Set baud rate as 115200 in the terminal application.
- Build and download the application project on the target board.
- Ensure connection from Gigabit(1000Mbps) capable network socket of a router/switch/computer to the board.
- 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 Client Test
a. Clear text connection (Port 80):
Enter following command in console: openurl <url>. For example, openurl http://www.microchip.com/ , the connection established here is clear text.
By entering the command stats and unixtime, the response is obtained as shown below.
The response from the server will be printed on the console as shown below.
b. Encrypted connection (Port 443):
Enter following command in console: openurl <url>. For example, openurl https://www.microchip.com/ , the connection established here is encrypted connection with wolfSSL.
The response from the server will be printed on the console as shown below.
By entering the command stats and unixtime, the response is obtained as shown below.
