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This code example demonstrates implementing a UDP server using the AnyCloud SDK for PSoC 6 MCU and CYW43xxx connectivity devices.

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UDP server

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

In this example, the UDP server waits for the UDP client to establish the connection. Once the connection is established, the server allows the user to send the LED ON/OFF command to the UDP client through a button press; the client responds by sending an acknowledgement message to the server.

This example uses the Wi-Fi Core FreeRTOS lwIP mbedtls library of the SDK. This library enables application development based on Wi-Fi, by pulling wifi-connection-manager, FreeRTOS, lwIP, mbed TLS, secure sockets and other dependent modules. The secure sockets library provides an easy-to-use API by abstracting the network stack (lwIP) and the security stack (mbed TLS).

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. The ModusToolbox™ software 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 If you do not upgrade, you will see an error like "unable to find CMSIS-DAP device" or "KitProg firmware is out of date".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

Install a terminal emulator if you don't have one. Instructions in this document use Tera Term.

  • Install a Python interpreter if you don't have one. This code example is tested with Python 3.7.7.

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 "mtb-example-wifi-udp-server" application with the desired name "UdpServer" 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-wifi-udp-client --user-app-name UdpServer --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

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.

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

  2. 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. These macros are defined in the udp_server.h file. Ensure that the Wi-Fi network that you are connecting to is configured as a private network for the proper functioning of this example.

    Note: CYSBSYSKIT-01 reserves UDP and TCP port numbers from 49152 to 57343.

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

  4. Program the board using one of the following:

    Using Eclipse IDE for ModusToolbox™

    1. Select the application project in the Project Explorer.

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

    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 and target are specified in the application's Makefile but you can override those values manually:

    make program TOOLCHAIN=<toolchain>

    Example:

    make program TOOLCHAIN=GCC_ARM

  5. After programming, the application starts automatically. Confirm that the following text as shown in Figure 1 is displayed on the UART terminal. Note that Wi-Fi SSID and the IP address assigned will be different based on the network that you have connected to.

    Figure 1. UART terminal showing the Wi-Fi connectivity status

  6. Ensure that your computer is connected to the same Wi-Fi access point that you have configured in Step 2. Make a note of the IP address assigned to the kit as shown in Figure 1.

  7. Open a command shell from the project directory and run the Python UDP client (udp_client.py) with the IP address from Figure 1 as an argument through the option --hostname.

    For example, if the IP address assigned to your kit is 192.168.43.231, enter the command as follows:

    python udp_client.py --hostname 192.168.43.231

    Note: Ensure that the firewall settings of your computer allow access to the Python software so that it can communicate with the UDP server. For more details on enabling Python access, see this community thread.

  8. Press the user button (CYBSP_USER_BTN) to send the LED ON/OFF command to the Python UDP client. Each user button press will issue the LED ON or LED OFF commands alternately. The client in turn sends an acknowledgement message back to the server. Figure 2 and Figure 3 show the UDP server and UDP client outputs respectively.

    Figure 2. UDP server output


    Figure 3. UDP client output

    Note: Instead of using the Python UDP client (udp_client.py), you can use the mtb-example-wifi-udp-server example to run as UDP server on the second kit. See the code example documentation to learn how to use the 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.

Design and implementation

Resources and settings

Table 1. Application resources

Resource Alias/object Purpose
SDIO (HAL) sdio_obj SDIO interface for Wi-Fi connectivity
UART (HAL) cy_retarget_io_uart_obj UART HAL object used by retarget-io for debug UART port
BUTTON (BSP) CYBSP_USER_BTN User button used to send LED ON/OFF commands to UDP server

This example uses the Arm® Cortex®-M4 (CM4) CPU of PSoC™ 6 MCU to execute an RTOS task: UDP Server 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 UDP server waits for the UDP client to establish the connection. Once the connection completes, the server allows you to send the LED ON/OFF command to the UDP client; the client responds by sending an acknowledgement message to the server.

Note: The CY8CPROTO-062-4343W board shares the same GPIO for the user button (CYBSP_USER_BTN) and the AIROC™ CYW4343W Wi-Fi Bluetooth® combo chip host wakeup pin. Because this example uses the GPIO for interfacing with the user button, the SDIO interrupt to wake up the host is disabled by setting CY_WIFI_HOST_WAKE_SW_FORCE to '0' in the Makefile through the DEFINES variable.


Related resources

Resources Links
Application notes AN228571 – Getting started with PSoC™ 6 MCU on ModusToolbox™
AN215656 – PSoC™ 6 MCU: Dual-CPU system design
Code examples Using ModusToolbox™ on GitHub
Using PSoC™ Creator
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 capsense – CAPSENSE™ library and documents
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.
PSoC™ Creator – IDE for PSoC™ and FM0+ MCU development

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 community.

Document history

Document title: CE230436 - UDP server

Version Description of change
1.0.0 New code example
2.0.0 Major update to support ModusToolbox™ software v2.2, added support for new kits.
This version is not backward compatible with ModusToolbox™ software v2.1
2.1.0 Added support for CYSBSYSKIT-01 and CYSBSYSKIT-DEV-01
2.2.0 Updated to FreeRTOS v10.3.1
2.3.0 Updated to FreeRTOS v10.4.3
Added support for new kits
3.0.0 Updated to support ModusToolbox™ software v2.4
Added support for new kits
Updated the BSPs to v3.X
3.1.0 Removed target specific macros from the source code
4.0.0 Major update to support ModusToolbox™ v3.0 and BSPs v4.X. This version is not backward compatible with previous versions of ModusToolbox™
4.1.0 Added support for CY8CEVAL-062S2-CYW43022CUB
4.2.0 Added support for new kits
4.3.0 Added support for CY8CEVAL-062S2-CYW955513SDM2WLIPA

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This code example demonstrates implementing a UDP server using the AnyCloud SDK for PSoC 6 MCU and CYW43xxx connectivity devices.

Topics

wi-fi cy8ckit-062-wifi-bt cy8cproto-062-4343w cy8ckit-062s2-43012 cy8cproto-062s3-4343w cyw9p62s1-43438evb-01 cyw9p62s1-43012evb-01 cy8ckit-064b0s2-4343w cy8ceval-062s2-lai-4373m2 cy8ceval-062s2-mur-43439m2 cysbsyskit-01 cysbsyskit-dev-01 cy8ceval-062s2-cyw43022cub

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