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HTTPS client Requirements Supported toolchains (make variable 'TOOLCHAIN') Supported kits (make variable 'TARGET') Hardware setup Software setup Using the code example Create the project Open the project Operation Debugging Known issues Design and implementation Resources and settings Creating a self-signed SSL certificate Generate an SSL certificate and private key Related resources Other resources Document history

README.md

HTTPS client

This code example demonstrates the implementation of an HTTPS client with PSoC™ 6 MCU and AIROC™ CYW43xxx Wi-Fi & Bluetooth® combo chips.

It employs the HTTPS client middleware library, which takes care of all the underlying socket connections with the HTTPS server. In this example, the HTTPS client establishes a secure connection with an HTTPS server through an SSL handshake. After the SSL handshake completes successfully, the HTTPS Client can make GET, POST, and PUT requests with the server.

View this README on GitHub.

Provide feedback on this code example.

Requirements

Supported toolchains (make variable 'TOOLCHAIN')

  • GNU Arm® Embedded Compiler v11.3.1 (GCC_ARM) – Default value of TOOLCHAIN
  • Arm® Compiler v6.16 (ARM)
  • IAR C/C++ Compiler v9.30.1 (IAR)

Supported kits (make variable 'TARGET')

Hardware setup

This example uses the board's default configuration. See the kit user guide to ensure that the board is configured correctly.

Note: The PSoC™ 6 Bluetooth® LE Pioneer Kit (CY8CKIT-062-BLE) and the PSoC™ 6 Wi-Fi Bluetooth® Pioneer Kit (CY8CKIT-062-WIFI-BT) ship with KitProg2 installed. ModusToolbox™ requires KitProg3. Before using this code example, make sure that the board is upgraded to KitProg3. The tool and instructions are available in the Firmware Loader GitHub repository. If you do not upgrade, you will see an error like "unable to find CMSIS-DAP device" or "KitProg firmware is out of date".

Software setup

See the ModusToolbox™ tools package installation guide for information about installing and configuring the tools package. Install a terminal emulator if you don't have one. Instructions in this document use Tera Term.

Note: To configure the kit as an HTTPS server, see the HTTPS server code example readme steps.

Using the code example

Create the project

The ModusToolbox™ tools package provides the Project Creator as both a GUI tool and a command line tool.

Use Project Creator GUI

  1. Open the Project Creator GUI tool.

    There are several ways to do this, including launching it from the dashboard or from inside the Eclipse IDE. For more details, see the Project Creator user guide (locally available at {ModusToolbox™ install directory}/tools_{version}/project-creator/docs/project-creator.pdf).

  2. On the Choose Board Support Package (BSP) page, select a kit supported by this code example. See Supported kits.

    Note: To use this code example for a kit not listed here, you may need to update the source files. If the kit does not have the required resources, the application may not work.

  3. On the Select Application page:

    a. Select the Applications(s) Root Path and the Target IDE.

    Note: Depending on how you open the Project Creator tool, these fields may be pre-selected for you.

    b. Select this code example from the list by enabling its check box.

    Note: You can narrow the list of displayed examples by typing in the filter box.

    c. (Optional) Change the suggested New Application Name and New BSP Name.

    d. Click Create to complete the application creation process.

Use Project Creator CLI

The 'project-creator-cli' tool can be used to create applications from a CLI terminal or from within batch files or shell scripts. This tool is available in the {ModusToolbox™ install directory}/tools_{version}/project-creator/ directory.

Use a CLI terminal to invoke the 'project-creator-cli' tool. On Windows, use the command-line 'modus-shell' program provided in the ModusToolbox™ installation instead of a standard Windows command-line application. This shell provides access to all ModusToolbox™ tools. You can access it by typing "modus-shell" in the search box in the Windows menu. In Linux and macOS, you can use any terminal application.

The following example clones the "Hello world" application with the desired name "MyHelloWorld" configured for the CY8CPROTO-062S2-43439 BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id CY8CPROTO-062S2-43439 --app-id mtb-example-psoc6-hello-world --user-app-name MyHelloWorld --target-dir "C:/mtb_projects"

The 'project-creator-cli' tool has the following arguments:

Argument Description Required/optional
--board-id Defined in the field of the BSP manifest Required
--app-id Defined in the field of the CE manifest Required
--target-dir Specify the directory in which the application is to be created if you prefer not to use the default current working directory Optional
--user-app-name Specify the name of the application if you prefer to have a name other than the example's default name Optional

Note: The project-creator-cli tool uses the git clone and make getlibs commands to fetch the repository and import the required libraries. For details, see the "Project creator tools" section of the ModusToolbox™ tools package user guide (locally available at {ModusToolbox™ install directory}/docs_{version}/mtb_user_guide.pdf).

Open the project

After the project has been created, you can open it in your preferred development environment.

Eclipse IDE

If you opened the Project Creator tool from the included Eclipse IDE, the project will open in Eclipse automatically.

For more details, see the Eclipse IDE for ModusToolbox™ user guide (locally available at {ModusToolbox™ install directory}/docs_{version}/mt_ide_user_guide.pdf).

Visual Studio (VS) Code

Launch VS Code manually, and then open the generated {project-name}.code-workspace file located in the project directory.

For more details, see the Visual Studio Code for ModusToolbox™ user guide (locally available at {ModusToolbox™ install directory}/docs_{version}/mt_vscode_user_guide.pdf).

Keil µVision

Double-click the generated {project-name}.cprj file to launch the Keil µVision IDE.

For more details, see the Keil µVision for ModusToolbox™ user guide (locally available at {ModusToolbox™ install directory}/docs_{version}/mt_uvision_user_guide.pdf).

IAR Embedded Workbench

Open IAR Embedded Workbench manually, and create a new project. Then select the generated {project-name}.ipcf file located in the project directory.

For more details, see the IAR Embedded Workbench for ModusToolbox™ user guide (locally available at {ModusToolbox™ install directory}/docs_{version}/mt_iar_user_guide.pdf).

Command line

If you prefer to use the CLI, open the appropriate terminal, and navigate to the project directory. On Windows, use the command-line 'modus-shell' program; on Linux and macOS, you can use any terminal application. From there, you can run various make commands.

For more details, see the ModusToolbox™ tools package user guide (locally available at {ModusToolbox™ install directory}/docs_{version}/mtb_user_guide.pdf).

Operation

HTTPS client code example needs a server to communicate. To test this code example, build and program another device with HTTPS server code example to act as an HTTPS server.

If using a PSoC™ 64 "Secure" MCU kit (like CY8CKIT-064B0S2-4343W), the PSoC™ 64 device must be provisioned with keys and policies before being programmed. Follow the instructions in the "Secure Boot" SDK user guide to provision the device. If the kit is already provisioned, copy-paste the keys and policy folder to the application folder.

Note: Use policy_single_CM0_CM4_smif_swap.json policy instead of using the default one "policy_single_CM0_CM4_swap.json" to provision CY8CKIT-064B0S2-4343W device.

  1. Connect the board to your PC using the provided USB cable through the KitProg3 USB connector.

  2. Open secure_http_client.h and modify the WIFI_SSID, WIFI_PASSWORD, and WIFI_SECURITY_TYPE macros to match the credentials of the Wi-Fi network that you want to connect to.

    All possible security types are defined in the cy_wcm_security_t structure in the cy_wcm.h file.

  3. Because this code example uses a self-signed SSL certificate, you need to generate the certificates required by the HTTPS server and client so that they can successfully establish a secure HTTPS connection. Follow the steps provided in a separate section that explains how to generate the certificates.

  4. Open the source/secure_keys.h file and do the following:

    1. Modify keyCLIENT_CERTIFICATE_PEM with the contents from the mysecurehttpclient.crt file generated in Step 3.
    2. Modify keyCLIENT_PRIVATE_KEY_PEM with the contents from the mysecurehttpclient.key file generated in Step 3.
    3. Modify keySERVER_ROOTCA_PEM with the contents from the rootCA.crt file generated in Step 3.

  5. Open the source/secure_http_client.h and modify the #define HTTPS_SERVER_HOST macro to match the Server IP address that you want to connect to.

  6. Open a terminal program and select the KitProg3 COM port. Set the serial port parameters to 8N1 and 115200 baud.

  7. Program the board using one of the following:

    Using Eclipse IDE

    1. Select the application project in the Project Explorer.

    2. In the Quick Panel, scroll down, and click <Application Name> Program (KitProg3_MiniProg4).

    In other IDEs

    Follow the instructions in your preferred IDE.

    Using CLI

    From the terminal, execute the make program command to build and program the application using the default toolchain to the default target. The default toolchain is specified in the application's Makefile but you can override this value manually:

    make program TOOLCHAIN=<toolchain>

    Example:

    make program TOOLCHAIN=GCC_ARM

  8. After programming, the application starts automatically. Verify that the following logs appear on the serial terminal:

    Info: ===================================
Info: HTTPS Client
Info: ===================================

WLAN MAC Address : 58:D5:0A:A9:CC:27
WLAN Firmware    : wl0: Jan 30 2020 21:41:53 version 7.45.98.95 (r724303 CY) FWID 01-5afc8c1e
WLAN CLM         : API: 12.2 Data: 9.10.39 Compiler: 1.29.4 ClmImport: 1.36.3 Creation: 2021-07-18 19:03:20
WHD VERSION      : 2.6.0.18446 : v2.6.0 : GCC 10.3 : 2023-03-17 21:20:01 +0800
Info: Wi-Fi initialization is successful
Info: Join to AP: WIFI_SSID
Info: Successfully joined Wi-Fi network WIFI_SSID
Info: Assigned IP address: 192.168.0.12
Info: successfully connected to https server

===============================================================
Please select the index of HTTPS method to be tested from below:

1. HTTPS_GET_METHOD
2. HTTPS_POST_METHOD
3. HTTPS_PUT_METHOD
4. HTTP_GET_PATH_FOR_PUT

===============================================================

  9. Ensure that your server is connected to the same Wi-Fi access point that you have configured in Step 2.

  10. If the selected method is HTTPS_GET_METHOD then verify that the HTTPS server responds with the following HTML output. This contains the LED status (ON or OFF) of the kit:

    HTTP GET GET Request..

Sending Request Headers:
GET / HTTP/1.1
User-Agent: mtb-example-wifi-https-client
Host: 192.168.127.89
Content-Type: application/x-www-form-urlencoded

Received HTTP response from 192.168.46.89/...
Response Headers:
Content-Type: text/html
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Connection: Keep-Alive
Transfer-Encoding: chunked
Response Status:
200

Response Body:
<!DOCTYPE html><html><head><title>HTTPS Server Demo</title></head><body><h1>HTTPS Server Demo</h1><form method="get"><fieldset><legend>HTTPS GET</legend><input type="submit" value="Get LED status"/><input type="text" name="led_status" value="OFF" size="3" readonly/></br></br></fieldset></br></form><form method="post"><fieldset><legend>HTTPS POST</legend><input type="submit" name="toggle_led" value="Toggle LED"/></br></br></fieldset></br></form></body></html>
buffer_len:[2048] headers_len:[172] header_count:[5] body_len:[467] content_len:[0]

Read Headers::
Connection : Keep-Alive
Successfully sent GET request to http server
The http status code is :: 0

  11. If the selected method is HTTPS_POST_METHOD then verify that the HTTPS server responds with the following HTML output. The response contains the LED status (ON or OFF) of the last GET request:

    HTTP POST Request..

Sending Request Headers:
POST / HTTP/1.1
User-Agent: anycloud-http-client
Host: 192.168.46.89
Connection: keep-alive

Received HTTP response from 192.168.46.89/...
Response Headers:
Content-Type: text/html
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Connection: Keep-Alive
Transfer-Encoding: chunked
Response Status:
200

Response Body:
<!DOCTYPE html><html><head><title>HTTPS Server Demo</title></head><body><h1>HTTPS Server Demo</h1>
<form method="get"><fieldset><legend>HTTPS GET</legend><input type="submit" value="Get LED status"/>
<input type="text" name="led_status" value="OFF" size="3" readonly/></br></br></fieldset></br></form>
<form method="post"><fieldset><legend>HTTPS POST</legend><input type="submit" name="toggle_led" 
value="Toggle LED"/></br></br></fieldset></br></form></body></html>
buffer_len:[2048] headers_len:[172] header_count:[5] body_len:[467] content_len:[0]

Read Headers::
Connection : Keep-Alive
Successfully sent GET request to http server
The http status code is :: 0

  12. If the selected method is HTTPS_PUT_METHOD to register a new HTTP resource ("/myhellomessage=Hello!"). The HTTPS server creates a new resource called "myhellomessage".The new resource creation logs you can find in server logs.

    HTTP PUT Request..

Sending Request Headers:
PUT / HTTP/1.1
User-Agent: mtb-example-wifi-https-client
Host: 192.168.127.89
Content-Type: application/x-www-form-urlencoded

Received HTTP response from 192.168.127.89/...
Response Headers:
Content-Type: text/html
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Connection: Keep-Alive
Transfer-Encoding: chunked
Response Status :
200
Response Body   :

buffer_len:[2048] headers_len:[172] header_count:[5] body_len:[0] content_len:[0]

Read Headers::
Connection : Keep-Alive
Successfully sent GET request to http server
The http status code is :: 0

  13. After that, verify the newly created resource by sending an HTTPS GET request, and the HTTPS server responds with a 'Hello' text message in the response body.

    HTTP GET FOR PUT method demo begins

Sending Request Headers:
GET /myhellomessage HTTP/1.1
User-Agent: mtb-example-wifi-https-client
Host: 192.168.127.89
Content-Type: application/x-www-form-urlencoded

Received HTTP response from 192.168.127.89/my...
Response Headers:
Content-Type: text/html
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Connection: Keep-Alive
Transfer-Encoding: chunked
Response Status :
200
Response Body   :
Hello!

buffer_len:[2048] headers_len:[172] header_count:[5] body_len:[6] content_len:[0]

Read Headers::
Connection : Keep-Alive
Successfully send get request to http server
The http status code is :: 0

Note: You may see an empty response for the first GET request. However, the subsequent GET request works correctly. This is a known issue and will be resolved in the future version of the code example.

Debugging

You can debug the example to step through the code. In the IDE, use the <Application Name> Debug (KitProg3_MiniProg4) configuration in the Quick Panel. For details, see the "Program and debug" section in the Eclipse IDE for ModusToolbox™ software user guide.

Note: (Only while debugging) On the CM4 CPU, some code in main() may execute before the debugger halts at the beginning of main(). This means that some code executes twice – once before the debugger stops execution, and again after the debugger resets the program counter to the beginning of main(). See KBA231071 to learn about this and for the workaround.

In other IDEs

Follow the instructions in your preferred IDE.

Known issues

An issue has been observed with the multicast domain name system (mDNS) when the device joins the home AP (D-Link DIR-816 and TP-Link Archer C20 APs). To work around this issue, connect the kit to a mobile hotspot if the device reports the following error when joining the AP.

Info: Wi-Fi initialization is successful
Info: Join to AP: WIFI_SSID
Function whd_wifi_unregister_multicast_address failed at line 2834 checkres = 101580800
Received buffer request ID: 42 (expectation: 42)
whd_cdc_send_ioctl is already timed out, drop the buffer

This issue will be addressed in a future update of this code example.

Design and implementation

Resources and settings

Table 1. Application resources

Resource Alias/object Purpose
UART (HAL) cy_retarget_io_uart_obj UART HAL object used by retarget-io for debug UART port

This example uses the Arm® Cortex®-M4 (CM4) CPU of PSoC™ 6 MCU to start the HTTPS client task. At device reset, the default Cortex®-M0+ (CM0+) application enables the CM4 CPU and configures the CM0+ CPU to go to sleep.

In this example, the HTTPS client establishes a secure connection with a server through an SSL handshake. During the SSL handshake, the server presents its SSL certificate for verification and verifies the incoming client's identity.

Creating a self-signed SSL certificate

The HTTPS client demonstrated in this example uses a self-signed SSL certificate. This requires OpenSSL which is preloaded in the ModusToolbox™ software installation. A self-signed SSL certificate means that there is no third-party certificate issuing authority, commonly referred to as CA, involved in the authentication of the server. Clients connecting to the server must have a root CA certificate to verify and trust the websites defined by the certificate. Only when the client trusts the website, it establishes a secure connection with the HTTPS server.

Do the following to generate a self-signed SSL certificate.

Generate an SSL certificate and private key

Run the following script to generate the self-signed SSL certificate and private key.

Before invoking the following command, modify the OPENSSL_SUBJECT_INFO macro in the generate_ssl_certs.sh file to match your local domain configuration such as Country, State, Locality, Organization, Organization Unit name, and Common Name. This macro is used by the openssl commands when generating the certificate.

cd scripts
./generate_ssl_certs.sh

This creates the following files:

File Description
mysecurehttpclient.crt HTTPS client certificate
mysecurehttpclient.key HTTPS client key
mysecurehttpclient.pfx Bundles the HTTPS client certificate and key in PKCS12 format
rootCA.crt HTTPS server rootCA certificate to trust the client
rootCA.key HTTPS server root key used for signing the certificate
mysecurehttpserver.local.crt HTTPS server certificate
mysecurehttpserver.local.key HTTPS server private key

Configure the HTTPS client to take mysecurehttpclient.crt as the certificate, mysecurehttpclient.key as the private key, and rootCA.crt as the rootCA certificate.

You can either convert the values to strings manually following the format shown in source/secure_keys.h or run the format_cert_key.py Python script to generate the string format of the certificate file. Pass the name of the certificate with the extension as an argument to the Python script:

Note: For Linux and macOS platforms, use python3 instead of python in the following command.

python format_cert_key.py <one-or-more-file-name-of-certificate-or-key-with-extension>

Example:

python format_cert_key.py root_ca.crt

Currently this code example uses the TLS v1.2. To use the TLS v1.3, uncomment the MBEDTLS_SSL_PROTO_TLS1_3 and FORCE_TLS_VERSION MBEDTLS_SSL_VERSION_TLS1_3 defines in the mbedtls_user_config.h file. However, note that the socket receive fails if the application establishes TLS v1.3 connection to a server where session tickets are enabled. This is due to a bug in third-party MBEDTLS library.

Related resources

Resources Links
Application notes AN228571 – Getting started with PSoC™ 6 MCU on ModusToolbox™ software
AN215656 – PSoC™ 6 MCU: Dual-CPU system design
Code examples Using ModusToolbox™ software on GitHub
Device documentation PSoC™ 6 MCU datasheets
PSoC™ 6 technical reference manuals
Development kits Select your kits from the evaluation board finder
Libraries on GitHub mtb-pdl-cat1 – PSoC™ 6 Peripheral Driver Library (PDL)
mtb-hal-cat1 – Hardware Abstraction Layer (HAL) library
retarget-io – Utility library to retarget STDIO messages to a UART port
Middleware on GitHub psoc6-middleware – Links to all PSoC™ 6 MCU middleware
Tools Eclipse IDE for ModusToolbox™ – ModusToolbox™ is a collection of easy-to-use software and tools enabling rapid development with Infineon MCUs, covering applications from embedded sense and control to wireless and cloud-connected systems using AIROC™ Wi-Fi and Bluetooth® connectivity devices.

Other resources

Infineon provides a wealth of data at www.infineon.com to help you select the right device, and quickly and effectively integrate it into your design.

For PSoC™ 6 MCU devices, see How to design with PSoC™ 6 MCU - KBA223067 in the Infineon Developer community.

Document history

Document title: CE237953 - HTTPS client

Version Description of change
1.0.0 New code example
1.1.0 Added support for KIT_XMC72_EVK_MUR_43439M2
Updated to support mbedtls v3.4.0 and ModusToolbox™ v3.1.
1.2.0 Added support for CY8CEVAL-062S2-CYW43022CUB
1.3.0 Added support for CY8CEVAL-062S2-CYW955513SDM2WLIPA
1.4.0 Disabled D-cache for XMC7000 based BSPs

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