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AWS IoT click

‍AWS IoT Click is a compact add-on board that allows users to easily connected to AWS IoT services and securely interact with cloud applications and other devices. This board features the ESP32-C3-MINI-1-N4-A, a small 2.4GHz WiFi (802.11 b/g/n) and Bluetooth® 5 module from Espressif Systems that use ESP32C3 series of SoC RISCV single-core microprocessor (ESP32-C3FN4) with 4MB flash in a single chip package. The module uses UART communication alongside several other features like standalone possibility via USB interface, firmware boot, JTAG for debugging, and others.

click Product page

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Click library

• Author : Stefan Filipovic
• Date : Mar 2023.
• Type : UART type

Software Support

We provide a library for the AWS IoT Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

‍This library contains API for AWS IoT Click driver.

Standard key functions :

• awsiot_cfg_setup Config Object Initialization function.

  void awsiot_cfg_setup ( awsiot_cfg_t *cfg );

• awsiot_init Initialization function.

  err_t awsiot_init ( awsiot_t *ctx, awsiot_cfg_t *cfg );

Example key functions :

• awsiot_reset_device This function resets device by toggling the RST pin state.

  void awsiot_reset_device ( awsiot_t *ctx );

• awsiot_send_cmd This function send command string by using UART serial interface.

  void awsiot_send_cmd ( awsiot_t *ctx, uint8_t *cmd );

Example Description

‍This example demonstrates the use of AWS IoT click board by bridging the USB UART

to mikroBUS UART which allows the click board to establish a connection with the AWS IoT over the Quick Connect demo application without an AWS account.

The demo application is composed of two sections :

Application Init

‍Initializes the driver, resets the click board to factory default settings, reads

and displays the vendor model and thing name on the USB UART, sets the WiFi credentials, and attempts to connect to the AWS Cloud. If the initial attempt fails and the error message "Failed to access network" or "Failed to login AWS (MQTT) broker" appears, check the WiFi credentials and try running the example again.

void application_init ( void )
{
    log_cfg_t log_cfg;  
    awsiot_cfg_t awsiot_cfg;  
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );
 
    // Click initialization.
    awsiot_cfg_setup( &awsiot_cfg );
    AWSIOT_MAP_MIKROBUS( awsiot_cfg, MIKROBUS_1 );
    if ( UART_ERROR == awsiot_init( &awsiot, &awsiot_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    log_printf( &logger, "Reset device\r\n\n" );
    awsiot_reset_device ( &awsiot );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    log_printf( &logger, "Factory reset\r\n" );
    strcpy ( app_buf, AWSIOT_CMD_FACTORY_RESET );
    awsiot_send_cmd ( &awsiot, app_buf );
    awsiot_read_response ( &awsiot );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    
    log_printf( &logger, "Vendor model\r\n" );
    strcpy ( app_buf, AWSIOT_CMD_CONF_CHECK );
    strcat ( app_buf, AWSIOT_CMD_SEPARATOR );
    strcat ( app_buf, AWSIOT_CONF_KEY_ABOUT );
    awsiot_send_cmd ( &awsiot, app_buf );
    awsiot_read_response ( &awsiot );
    
    log_printf( &logger, "Thing name\r\n" );
    strcpy ( app_buf, AWSIOT_CMD_CONF_CHECK );
    strcat ( app_buf, AWSIOT_CMD_SEPARATOR );
    strcat ( app_buf, AWSIOT_CONF_KEY_THING_NAME );
    awsiot_send_cmd ( &awsiot, app_buf );
    awsiot_read_response ( &awsiot );
    
    log_printf( &logger, "WiFi SSID\r\n" );
    strcpy ( app_buf, AWSIOT_CMD_CONF );
    strcat ( app_buf, AWSIOT_CMD_SEPARATOR );
    strcat ( app_buf, AWSIOT_CONF_KEY_SSID );
    strcat ( app_buf, AWSIOT_CMD_SIGN_EQUAL );
    strcat ( app_buf, WIFI_SSID );
    awsiot_send_cmd ( &awsiot, app_buf );
    awsiot_read_response ( &awsiot );
    
    log_printf( &logger, "WiFi Password\r\n" );
    strcpy ( app_buf, AWSIOT_CMD_CONF );
    strcat ( app_buf, AWSIOT_CMD_SEPARATOR );
    strcat ( app_buf, AWSIOT_CONF_KEY_PASSPHRASE );
    strcat ( app_buf, AWSIOT_CMD_SIGN_EQUAL );
    strcat ( app_buf, WIFI_PASS );
    awsiot_send_cmd ( &awsiot, app_buf );
    awsiot_read_response ( &awsiot );
    
    log_printf( &logger, "Try to connect\r\n" );
    strcpy ( app_buf, AWSIOT_CMD_CONNECT );
    awsiot_send_cmd ( &awsiot, app_buf );
    awsiot_read_response ( &awsiot );
    
    log_info( &logger, " Application Task " );
    
    log_printf( &logger, "Now close the UART terminal and switch to the QuickConnect app\r\n" );
    Delay_ms ( 1000 );
    
    uart_set_blocking( &logger.uart, false );
}

Application Task

‍All data received from the USB UART will be forwarded to mikroBUS UART, and vice versa.

At this point you should disconnect from the UART terminal and run the Quick Connect demo application.

void application_task ( void )
{
    app_buf_len = uart_read( &logger.uart, app_buf, PROCESS_BUFFER_SIZE );
    if ( app_buf_len > 0 ) 
    {
        uart_write ( &awsiot.uart, app_buf, app_buf_len );
        awsiot_clear_app_buf( );
    }
    app_buf_len = uart_read( &awsiot.uart, app_buf, PROCESS_BUFFER_SIZE );
    if ( app_buf_len > 0 ) 
    {
        uart_write ( &logger.uart, app_buf, app_buf_len );
        awsiot_clear_app_buf( );
    }
}

Note

‍To run the demo, follow the below steps:

1. If you opened a terminal application in the previous step, be sure to > disconnect that application from the serial port.
2. Download the Quick Connect executable:

• Mac
• Windows
• Linux

1. Unzip the package, and follow the steps from the README file.

The demo will connect to AWS IoT and give you an URL that you can use to visualize data

flowing from the device to the cloud using AT+SEND commands. The demo will run for up to two minutes, and afterwards, you will be able to type AT+SEND commands yourself and see the data coming in on the visualizer.

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.AWSIoT

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.

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