README.md

# AIROC™ CYW43907 UDP server

This code example demonstrates the implementation of a UDP server with AIROC™ CYW43907.

In this example, the UDP server waits for the UDP client to establish connection. Once the connection is established, the server allows the user to send the LED ON or 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 middleware core](https://github.com/Infineon/wifi-mw-core) library of the AnyCloud SDK. This library enables Wi-Fi-based application development by bundling together various other libraries - FreeRTOS, Wi-Fi host driver (WHD), lwIP TCP/IP stack, Mbed TLS, and Secure sockets library. 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.](https://github.com/Infineon/mtb-example-cyw43907-udp-server)

[Provide feedback on this code example.](https://cypress.co1.qualtrics.com/jfe/form/SV_1NTns53sK2yiljn?Q_EED=eyJVbmlxdWUgRG9jIElkIjoiQ0UyMzQwOTQiLCJTcGVjIE51bWJlciI6IjAwMi0zNDA5NCIsIkRvYyBUaXRsZSI6IkFJUk9DJnRyYWRlOyBDWVc0MzkwNyBVRFAgc2VydmVyIiwicmlkIjoidmVsbXVydWdhbiIsIkRvYyB2ZXJzaW9uIjoiMi4wLjAiLCJEb2MgTGFuZ3VhZ2UiOiJFbmdsaXNoIiwiRG9jIERpdmlzaW9uIjoiTUNEIiwiRG9jIEJVIjoiSUNXIiwiRG9jIEZhbWlseSI6IldJRkkifQ==)

## Requirements

- [ModusToolbox™ software](https://www.infineon.com/modustoolbox) v3.1 or later (tested with v3.1)
- Board support package (BSP) minimum required version: 1.0.0
- Programming language: C
- Associated parts: [AIROC™ CYW43907 embedded wireless SoC ](https://www.infineon.com/cms/en/product/wireless-connectivity/airoc-connected-mcu/cyw43907)

## Supported toolchains (make variable 'TOOLCHAIN')

- GNU Arm® embedded compiler v11.3.1 (`GCC_ARM`) - Default value of `TOOLCHAIN`

## Supported kits (make variable 'TARGET')

- [AIROC™ CYW43907 embedded wireless SoC kit](https://www.infineon.com/cms/en/product/evaluation-boards/cyw943907aeval1f) (`CYW943907AEVAL1F`) – Default value of `TARGET`

## Hardware setup

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

## Software setup

Install a terminal emulator if you don't have one. Instructions in this document use [PuTTY](https://www.putty.org/).

- Install a Python interpreter if you don't have one. This code example is tested using [Python 3.7.7](https://www.python.org/downloads/release/python-377/).

This example requires no additional software or tools.


## Using the code example

Create the project and open it using one of the following:

<details><summary><b>In Eclipse IDE for ModusToolbox&trade; software</b></summary>

1. Click the **New Application** link in the **Quick Panel** (or, use **File** > **New** > **ModusToolbox&trade; Application**). This launches the [Project Creator](https://www.infineon.com/ModusToolboxProjectCreator) tool.

2. Pick a kit supported by the code example from the list shown in the **Project Creator - Choose Board Support Package (BSP)** dialog.

   When you select a supported kit, the example is reconfigured automatically to work with the kit. To work with a different supported kit later, use the [Library Manager](https://www.infineon.com/ModusToolboxLibraryManager) to choose the BSP for the supported kit. You can use the Library Manager to select or update the BSP and firmware libraries used in this application. To access the Library Manager, click the link from the **Quick Panel**.

   You can also just start the application creation process again and select a different kit.

   If you want to use the application 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. In the **Project Creator - Select Application** dialog, choose the example by enabling the checkbox.

4. (Optional) Change the suggested **New Application Name**.

5. The **Application(s) Root Path** defaults to the Eclipse workspace which is usually the desired location for the application. If you want to store the application in a different location, you can change the *Application(s) Root Path* value. Applications that share libraries should be in the same root path.

6. Click **Create** to complete the application creation process.

For more details, see the [Eclipse IDE for ModusToolbox&trade; software user guide](https://www.infineon.com/MTBEclipseIDEUserGuide) (locally available at *{ModusToolbox&trade; software install directory}/docs_{version}/mt_ide_user_guide.pdf*).

</details>

<details><summary><b>In command-line interface (CLI)</b></summary>

ModusToolbox&trade; software provides the Project Creator as both a GUI tool and the command line tool, "project-creator-cli". The 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&trade; software 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&trade; software installation instead of a standard Windows command-line application. This shell provides access to all ModusToolbox&trade; software 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 "project-creator-cli" tool has the following arguments:

Argument | Description | Required/optional
---------|-------------|-----------
`--board-id` | Defined in the `<id>` field of the [BSP](https://github.com/Infineon?q=bsp-manifest&type=&language=&sort=) manifest | Required
`--app-id`   | Defined in the `<id>` field of the [CE](https://github.com/Infineon?q=ce-manifest&type=&language=&sort=) 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

<br />

The following example clones the "[mtb-example-cyw43907-udp-server](https://github.com/Infineon/mtb-example-cyw43907-udp-server)" application with the desired name "MyUDPserver" configured for the *CYW943907AEVAL1F* BSP into the specified working directory, *C:/mtb_projects*:

   ```
   project-creator-cli --board-id CYW943907AEVAL1F --app-id mtb-example-cyw43907-udp-server --user-app-name MyUDPserver --target-dir "C:/mtb_projects"
   ```

**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&trade; software user guide](https://www.infineon.com/ModusToolboxUserGuide) (locally available at *{ModusToolbox&trade; software install directory}/docs_{version}/mtb_user_guide.pdf*).

To work with a different supported kit later, use the [Library Manager](https://www.infineon.com/ModusToolboxLibraryManager) to choose the BSP for the supported kit. You can invoke the Library Manager GUI tool from the terminal using `make library-manager` command or use the Library Manager CLI tool "library-manager-cli" to change the BSP.

The "library-manager-cli" tool has the following arguments:

Argument | Description | Required/optional
---------|-------------|-----------
`--add-bsp-name` | Name of the BSP that should be added to the application | Required
`--set-active-bsp` | Name of the BSP that should be as active BSP for the application | Required
`--add-bsp-version`| Specify the version of the BSP that should be added to the application if you do not wish to use the latest from manifest | Optional
`--add-bsp-location`| Specify the location of the BSP (local/shared) if you prefer to add the BSP in a shared path | Optional

<br />

Following example adds the CYW943907AEVAL1F BSP to the already created application and makes it the active BSP for the app:

   ```
   ~/ModusToolbox/tools_{3.1}/library-manager/library-manager-cli --project "C:/mtb-example-cyw43907-udp-server" --add-bsp-name CYW943907AEVAL1F --add-bsp-version "latest-v1.X" --add-bsp-location "local"

   ~/ModusToolbox/tools_{3.1}/library-manager/library-manager-cli --project "C://mtb-example-cyw43907-udp-server" --set-active-bsp APP_CYW943907AEVAL1F
   ```

</details>

<details><summary><b>In third-party IDEs</b></summary>

Use one of the following options:

- **Use the standalone [Project Creator](https://www.infineon.com/ModusToolboxProjectCreator) tool:**

   1. Launch Project Creator from the Windows Start menu or from *{ModusToolbox&trade; software install directory}/tools_{version}/project-creator/project-creator.exe*.

   2. In the initial **Choose Board Support Package** screen, select the BSP, and click **Next**.

   3. In the **Select Application** screen, select the appropriate IDE from the **Target IDE** drop-down menu.

   4. Click **Create** and follow the instructions printed in the bottom pane to import or open the exported project in the respective IDE.

<br />

- **Use command-line interface (CLI):**

   1. Follow the instructions from the **In command-line interface (CLI)** section to create the application, and then import the libraries using the `make getlibs` command.

   2. Export the application to a supported IDE using the `make <ide>` command.

   3. Follow the instructions displayed in the terminal to create or import the application as an IDE project.

For a list of supported IDEs and more details, see the "Exporting to IDEs" section of the [ModusToolbox&trade; software user guide](https://www.infineon.com/ModusToolboxUserGuide) (locally available at *{ModusToolbox&trade; software install directory}/docs_{version}/mtb_user_guide.pdf*).

</details>


## Operation

1. Connect the board to your PC using the provided USB cable through the micro-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.

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

3. Program the board using one of the following:

   <details><summary><b>Using Eclipse IDE for ModusToolbox&trade; software</b></summary>

      1. Select the application project in the Project Explorer.

      2. In the **Quick Panel**, scroll down, and click **\<Application Name> Program (FTDI)**.
      </details>

   <details><summary><b>Using CLI</b></summary>

     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 these values manually:
      ```
      make program TARGET=<BSP> TOOLCHAIN=<toolchain>
      ```

      Example:
      ```
      make program TARGET=CYW943907AEVAL1F TOOLCHAIN=GCC_ARM
      ```
   </details>

     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**

     ![](images/uart-terminal-output.png)


5. 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**.

6. 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 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](https://community.infineon.com/t5/ModusToolbox-General/CE229112-Enable-Python-access-to-your-WiFi/td-p/214654).

7. Press the user button (`CYBSP_SW1`) 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**

   ![](images/udp-server-output.png)

   <br>

   **Figure 3. UDP client output**

   ![](images/udp-client-output.png)

   **Note:** Instead of using the Python UDP client (*udp_client.py*), you can use the [mtb-example-cyw43907-udp-client](https://github.com/Infineon/mtb-example-cyw43907-udp-client) example to run as UDP client on a 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 (FTDI)** configuration in the **Quick Panel**. For more details, see the "Program and debug" section in the [Eclipse IDE for ModusToolbox&trade; software user guide](https://www.infineon.com/MTBEclipseIDEUserGuide).

## Design and implementation

### Resources and settings

**Table 1. Application resources**

| Resource  |  Alias/object     |    Purpose     |
| :------- | :------------    | :------------ |
| M2M (HAL)  | m2m_obj        | M2M 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_SW1 | User button used to send LED ON/OFF commands to UDP client |

<br>

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 or OFF command to the UDP client; the client responds by sending an acknowledgement message to the server.

## Related resources

Resources  | Links
-----------|----------------------------------
Code examples  | [Using ModusToolbox&trade; software](https://github.com/Infineon/Code-Examples-for-ModusToolbox-Software) on GitHub <br>
Device documentation | [AIROC&trade; CYW43907 datasheet](https://www.infineon.com/dgdl/Infineon-CYW43907-WICED-IEEE-802.11-a-b-g-n-SoC-with-an-Embedded-Applications-Processor-AdditionalTechnicalInformation-v13_00-EN.pdf?fileId=8ac78c8c7d0d8da4017d0ee1fbda682d) <br>
Development kits | Select your kits from the [evaluation board finder](https://www.infineon.com/cms/en/design-support/finder-selection-tools/product-finder/evaluation-board)
Libraries on GitHub  | [mtb-hal-cat4](https://github.com/Infineon/mtb-hal-cat4) – AIROC&trade; CYW43907 Hardware abstraction layer (HAL) library <br> [retarget-io](https://github.com/Infineon/retarget-io) – Utility library to retarget STDIO messages to a UART port <br>
Middlewares on GitHub  | [ModusToolbox™ software](https://github.com/Infineon/modustoolbox-software) – Links to all ModusToolbox™ middlewares, libraries and documents<br>
Tools  | [Eclipse IDE for ModusToolbox&trade; software](https://www.infineon.com/modustoolbox) – ModusToolbox&trade; software 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&trade; Wi-Fi and Bluetooth&reg; connectivity devices

<br />

## Other resources

Infineon provides a wealth of data at [www.infineon.com](https://www.infineon.com) to help you select the right device, and quickly and effectively integrate it into your design.

## Document history

Document Title: *CE234094* - *AIROC&trade; CYW43907 UDP server*

| Version | Description of change |
| ------- | --------------------- |
| 1.0.0   | New code example      |                           |
 2.0.0   | Major update to support ModusToolbox™ v3.1 and BSPs v1.0.0 <br /> This version is not backward compatible with previous versions (below ModusToolbox™ v3.0) of ModusToolbox&trade; software 


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