AIROC™ CYW43907 TCP client

This code example demonstrates the implementation of a TCP client with AIROC™ CYW43907 connectivity processor.

The example establishes a connection with a remote TCP server and based on the command received from the TCP server, turns the user LED ON or OFF. Additionally, this code example can be configured to bring up the Wi-Fi device either in STA interface or in Soft AP interface mode.

This example uses the Wi-Fi middleware 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.

Provide feedback on this code example.

Requirements

ModusToolbox™ software 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

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 (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.

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

This example requires no additional software or tools.

Using the code example

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

In Eclipse IDE for ModusToolbox™ software

Click the New Application link in the Quick Panel (or, use File > New > ModusToolbox™ Application). This launches the Project Creator tool.
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 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.
In the Project Creator - Select Application dialog, choose the example by enabling the checkbox.
(Optional) Change the suggested New Application Name.
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.
Click Create to complete the application creation process.

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

In command-line interface (CLI)

ModusToolbox™ 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™ 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™ software installation instead of a standard Windows command-line application. This shell provides access to all ModusToolbox™ 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 manifest	Required
`--app-id`	Defined in the `<id>` 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

The following example clones the "mtb-example-cyw43907-tcp-client" application with the desired name "MyTCPclient" configured for the CYW943907AEVAL1F BSP into the specified working directory, C:/mtb_projects:

project-creator-cli --board-id CYW943907AEVAL1F --app-id mtb-example-cyw43907-tcp-client --user-app-name MyTCPclient --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™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mtb_user_guide.pdf).

To work with a different supported kit later, use the Library Manager 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

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

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

~/ModusToolbox/tools_{version}/library-manager/library-manager-cli --project "C:/mtb-example-cyw43907-tcp-client" --set-active-bsp APP_CYW943907AEVAL1F

In third-party IDEs

Use one of the following options:

Use the standalone Project Creator tool:
1. Launch Project Creator from the Windows Start menu or from {ModusToolbox™ 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.

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™ software user guide (locally available at {ModusToolbox™ software install directory}/docs_{version}/mtb_user_guide.pdf).

Operation

Connect the board to your PC using the provided USB cable.
The kit can be configured to run either as Wi-Fi STA interface mode or in AP interface mode. The interface mode is configured using the USE_AP_INTERFACE macro defined in the tcp_client.c file. Based on the desired interface mode, do the following:

Kit in STA mode (default interface):
1. Set the USE_AP_INTERFACE macro to '0' which is the default mode.
2. Modify the WIFI_SSID, WIFI_PASSWORD, and WIFI_SECURITY_TYPE macros to match with that of the Wi-Fi network credentials that you want to connect. These macros are defined in the tcp_client.c 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: The maximum length of the WIFI_SSID and WIFI_PASSWORD values should not exceed CY_WCM_MAX_SSID_LEN (32) and CY_WCM_MAX_PASSPHRASE_LEN (64) macros respectively.
Kit in AP mode:
1. Set the USE_AP_INTERFACE macro to '1'.
2. Update SOFTAP_SSID, SOFTAP_PASSWORD, and SOFTAP_SECURITY_TYPE as desired. This step is optional.
Open a terminal program and select the COM port. Set the serial port parameters to 8N1 and 115200 baud.
Program the board using one of the following:
Using Eclipse IDE for ModusToolbox™ software
1. Select the application project in the Project Explorer.
2. In the Quick Panel, scroll down, and click <Application Name> Program (FTDI).
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 these values manually:
```
make program TARGET=<BSP> TOOLCHAIN=<toolchain>
```
Example:
```
make program TARGET=CYW943907AEVAL1F TOOLCHAIN=GCC_ARM
```
After programming, the application starts automatically. Confirm that the text as shown in Figure 1 for STA mode and Figure 2 in AP mode is displayed on the UART terminal. Note that in STA mode, the Wi-Fi SSID and IP address assigned will be different based on the network that you have connected to; in AP mode, the AP credentials will be different based on your configuration in Step 2.

Figure 1. Wi-Fi connectivity status in STA mode

Figure 2. Wi-Fi connectivity status in AP mode
Connect your computer to the Wi-Fi AP that you have configured in Step 2:
- In STA mode: Connect the computer to the AP to which the kit is connected.
- In AP mode: Connect the computer to the kit's AP.
Open a command shell from the project directory and run the Python TCP server (tcp_server.py). In the command shell opened in the project directory, type in the following command:
```
python tcp_server.py
```
Make a note of the TCP server's IPv4 address.

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

Figure 3. TCP server IPv4 address
From the UART terminal, enter the IPv4 address for the TCP server as noted in Step 6.

For example, if the TCP server IPv4 address is 192.168.10.2, then enter the IP address from the UART terminal as shown in Figure 4 and press the Enter key.

Figure 4. Entering the IPv4 address from the UART terminal
From the Python TCP server, send the command to turn the LED ON or OFF to the TCP client ('0' to turn LED OFF and '1' to turn LED ON). Observe the user LED (CYBSP_USER_LED2) turning ON or OFF on the board.

Figure 5. TCP server output

Figure 6. LED status on TCP client STA/AP Mode

Note: Instead of using the Python TCP server (tcp_server.py), you can use the example mtb-example-cyw43907-tcp-server to run as TCP server on a second kit. See the code example documentation.

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™ software user guide.

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
LED (BSP)	CYBSP_USER_LED2	User LED to show output

Related resources

Resources	Links
Code examples	Using ModusToolbox™ software on GitHub
Device documentation	AIROC™ CYW43907 datasheet
Development kits	Select your kits from the evaluation board finder
Libraries on GitHub	mtb-hal-cat4 – AIROC™ CYW43907 Hardware abstraction layer (HAL) library retarget-io – Utility library to retarget STDIO messages to a UART port
Middlewares on GitHub	ModusToolbox™ software – Links to all ModusToolbox™ middlewares, libraries and documents
Tools	Eclipse IDE for ModusToolbox™ software – ModusToolbox™ 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™ 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.

Document history

Document title: CE234104 – AIROC™ CYW43907 TCP client

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 This version is not backward compatible with previous versions (below ModusToolbox™ v3.0) of ModusToolbox™ software

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