Socket Select#

1. Purpose / Scope#

This application demonstrates how to create the multiple sockets in RS9116W EVK and monitor multiple sockets for a certain activity to occur. If there is some data to be read on one of the sockets, the Select provides the response about the socket whether the data is to be read on the socket or not.

2. Prerequisites / Setup Requirements#

Before running the application, the user will need the following things to setup.

2.1 Hardware Requirements#

Windows PC with Host interface (UART / SPI).
Silicon Labs RS9116 Wi-Fi Evaluation Kit
Host MCU Eval Kit. This example has been tested with:
- Silicon Labs WSTK + EFR32MG21
- STM32F411 Nucleo
Wireless Access point
TCP client application running in Windows PC2 (This uses iperf application to open TCP client socket in remote PC)

Setup Diagram for socket select Example

2.2 Software Requirements#

WiSeConnect SDK
Embedded Development Environment
- For STM32, use licensed Keil IDE
- For Silicon Labs EFx32, use the latest version of Simplicity Studio
- Iperf Application in the remote PC.

3. Application Build Environment#

3.1 Platform#

The Application can be built and executed on below Host platforms

3.2 Host Interface#

By default, the application is configured to use the SPI bus for interfacing between Host platforms and the RS9116W EVK.
The SAPI driver provides APIs to enable other host interfaces if SPI is not suitable for your needs.

3.3 Project Configuration#

The Application is provided with the project folder containing Keil and Simplicity Studio project files.

Keil Project
- The Keil project is used to evaluate the application on STM32.
- Project path: <SDK>/examples/snippets/wlan/socket_select_app/projects/socket_select_app-nucleo-f411re.uvprojx
Simplicity Studio
- The Simplicity Studio project is used to evaluate the application on EFR32MG21.
- Project path:
  - If the Radio Board is BRD4180A or BRD4181A, then access the path <SDK>/examples/snippets/wlan/socket_select_app/projects/socket_select_app-brd4180a-mg21.slsproj
  - If the Radio Board is BRD4180B or BRD4181B, then access the path <SDK>/examples/snippets/wlan/socket_select_app/projects/socket_select_app-brd4180b-mg21.slsproj
  - User can find the Radio Board version as given below

EFR Radio Boards

3.4 Bare Metal Support#

This application supports only bare metal environment. By default, the application project files (Keil and Simplicity studio) are provided with bare metal configuration in the SDK.

4. Application Configuration Parameters#

The application can be configured to suit user requirements and development environment. Read through the following sections and make any changes needed.

4.1 Open rsi_mqtt.c file#

4.1.1 User must update the below parameters#

SSID refers to the name of the Access point.

#define SSID                                    "SILABS_AP"

CHANNEL_NO refers to the channel in which device should scan. If it is 0 device will scan all channels.

#define CHANNEL_NO                              0

SECURITY_TYPE refers to the type of security. In this application STA supports Open, WPA-PSK, WPA2-PSK securities.

Valid configuration is:

RSI_OPEN - For OPEN security mode
RSI_WPA - For WPA security mode
RSI_WPA2 - For WPA2 security mode

#define SECURITY_TYPE                           RSI_WPA2

PSK refers to the secret key if the Access point configured in WPA-PSK/WPA2-PSK security modes.

#define PSK                  "1234567890"

4.1.2 The desired parameters are provided below. User can also modify the parameters as per their needs and requirements.#

To configure IP address

DHCP_MODE refers whether IP address configured through DHCP or STATIC

#define DHCP_MODE                               1

Note: If user wants to configure STA IP address through DHCP then set DHCP_MODE to "1" and skip configuring the following DEVICE_IP, GATEWAY and NETMASK macros. (Or) If user wants to configure STA IP address through STATIC then set DHCP_MODE macro to "0" and configure following DEVICE_IP, GATEWAY and NETMASK macros.

IP address to be configured to the device in STA mode should be in long format and in little endian byte order.

Example: To configure "192.168.10.10" as IP address, update the macro DEVICE_IP as 0x0A0AA8C0.

#define DEVICE_IP                               0X0A0AA8C0

IP address of the gateway should also be in long format and in little endian byte order

Example: To configure "192.168.10.1" as Gateway, update the macro GATEWAY as 0x010AA8C0.

#define GATEWAY                                 0x010AA8C0

IP address of the network mask should also be in long format and in little endian byte order

Example: To configure "255.255.255.0" as network mask, update the macro NETMASK as 0x00FFFFFF.

#define NETMASK                                 0x00FFFFFF

Application memory length which is required by the driver

#define GLOBAL_BUFF_LEN                         15000

User can connect to access point through PMK

To Enable keep 1 else 0

#define CONNECT_WITH_PMK                         0

Note: If CONNECT_WITH_PMK is enabled, SECURITY_TYPE is set to RSI_WPA2_PMK.

4.2 Open rsi_wlan_config.h file. User can also modify the below parameters as per their needs and requirements.#

#define CONCURRENT_MODE                      RSI_DISABLE
#define RSI_FEATURE_BIT_MAP                  FEAT_SECURITY_OPEN
#define RSI_TCP_IP_BYPASS                    RSI_DISABLE
#define RSI_TCP_IP_FEATURE_BIT_MAP           (TCP_IP_FEAT_DHCPV4_CLIENT | TCP_IP_FEAT_EXTENSION_VALID)
#define RSI_EXT_TCPIP_FEATURE_BITMAP         (RSI_NUMBER_OF_SELECTS << 12)
#define RSI_CUSTOM_FEATURE_BIT_MAP           0
#define RSI_BAND                             RSI_BAND_2P4GHZ

Power save configuration

By default, the application is configured without power save.

#define ENABLE_POWER_SAVE          0

If user wants to run the application in power save, modify the below macro.

#define ENABLE_POWER_SAVE          1

5. Testing the Application#

Follow the below steps for the successful execution of the application.

5.1 Loading the RS9116W Firmware#

Refer Getting started with a PC to load the firmware into RS9116W EVK. The firmware file is located in <SDK>/firmware/

5.2 Building the Application on the Host Platform#

5.2.1 Using STM32#

Refer Getting started with STM32

Open the project <SDK>/examples/snippets/wlan/socket_select_app/projects/socket_select_app-nucleo-f411re.uvprojx in Keil IDE.
Build and Debug the project
Check for the RESET pin:
- If RESET pin is connected from STM32 to RS9116W EVK, then user need not press the RESET button on RS9116W EVK before free run.
- If RESET pin is not connected from STM32 to RS9116W EVK, then user need to press the RESET button on RS9116W EVK before free run.
Free run the project.
Then continue the common steps from 5.3

5.2.2 Using EFX32#

Refer Getting started with EFX32

Open Simplicity Studio and import the project from <SDK>/examples/snippets/wlan/socket_select_app/projects
Select the appropriate .slsproj as per the Radio Board type mentioned in Section 3.3
Compile and flash the project in to Host MCU
Debug the project
Check for the RESET pin:
- If RESET pin is connected from STM32 to RS9116W EVK, then user need not press the RESET button on RS9116W EVK before free run
- If RESET pin is not connected from STM32 to RS9116W EVK, then user need to press the RESET button on RS9116W EVK before free run
Free run the project
Then continue the common steps from 5.3

5.3 Common Steps#

Configure the Access point in OPEN / WPA-PSK / WPA2-PSK mode to connect RS9116W EVK in STA mode.
After the program gets executed, RS9116W EVK is configured as client and connects to AP and gets IP.
After successful connection with the access point, the socket select is issued for the desired socket.
Open TCP client from WindowsPC2 and connect to TCP server opened on the device on port number DEVICE_PORT.
Select provides the response about the socket whether the data is to be read on the socket or not.
If data is to be received on the socket, then the receive function is called on the socket.