LTE IoT Click

LTE IoT Click is a Click board™ that allows connection to the LTE and 2G networks.

Click Product page

Click library

• Author : MikroE Team
• Date : Apr 2020.
• Type : UART GSM/IOT type

Software Support

We provide a library for the LteIot 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for LteIot Click driver.

Standard key functions :

• LTE IoT configuration object setup function.

  void lteiot_cfg_setup ( lteiot_cfg_t *cfg );

• LTE IoT initialization function.

  err_t lteiot_init ( lteiot_t ctx, lteiot_cfg_t cfg );

Example key functions :

• LTE IoT module power on.

  void lteiot_power_on ( lteiot_t *ctx );

• Send command function.

  void lteiot_send_cmd ( lteiot_t ctx, char cmd );

Examples Description

This example reads and processes data from LTE IoT Click.

The demo application is composed of two sections :

Application Init

Initializes driver and wake-up module and sets default configuration for connecting device to network.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    lteiot_cfg_t lteiot_cfg;  /**< Click config object. */

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );
    Delay_ms ( 1000 );

    // Click initialization.
    lteiot_cfg_setup( &lteiot_cfg );
    LTEIOT_MAP_MIKROBUS( lteiot_cfg, MIKROBUS_1 );
    err_t init_flag  = lteiot_init( &lteiot, &lteiot_cfg );
    if ( init_flag == UART_ERROR )
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    log_info( &logger, " Power on device... " );
    lteiot_power_on( &lteiot );

    // dummy read
    lteiot_process( );
    lteiot_clear_app_buf( );

    // AT
    lteiot_send_cmd( &lteiot, LTEIOT_CMD_AT );
    app_error_flag = lteiot_rsp_check( );
    lteiot_error_check( app_error_flag );
    Delay_ms ( 500 );

    // ATI - product information
    lteiot_send_cmd( &lteiot, LTEIOT_CMD_ATI );
    app_error_flag = lteiot_rsp_check(  );
    lteiot_error_check( app_error_flag );
    Delay_ms ( 500 );

    // CGMR - firmware version
    lteiot_send_cmd( &lteiot, LTEIOT_CMD_CGMR );
    app_error_flag = lteiot_rsp_check(  );
    lteiot_error_check( app_error_flag );
    Delay_ms ( 500 );

    // COPS - deregister from network
    lteiot_send_cmd_with_parameter( &lteiot, LTEIOT_CMD_COPS, "2" );
    app_error_flag = lteiot_rsp_check(  );
    lteiot_error_check( app_error_flag );
    Delay_ms ( 500 );

    // CGDCONT - set sim apn
    lteiot_set_sim_apn( &lteiot, SIM_APN );
    app_error_flag = lteiot_rsp_check(  );
    lteiot_error_check( app_error_flag );
    Delay_ms ( 500 );

    // CFUN - full funtionality
    lteiot_send_cmd_with_parameter( &lteiot, LTEIOT_CMD_CFUN, "1" );
    app_error_flag = lteiot_rsp_check(  );
    lteiot_error_check( app_error_flag );
    Delay_ms ( 500 );

    // COPS - automatic mode
    lteiot_send_cmd_with_parameter( &lteiot, LTEIOT_CMD_COPS, "0" );
    app_error_flag = lteiot_rsp_check(  );
    lteiot_error_check( app_error_flag );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );

    // CEREG - network registration status
    lteiot_send_cmd_with_parameter( &lteiot, LTEIOT_CMD_CEREG, "2" );
    app_error_flag = lteiot_rsp_check(  );
    lteiot_error_check( app_error_flag );
    Delay_ms ( 500 );

    // CIMI - request IMSI
    lteiot_send_cmd( &lteiot, LTEIOT_CMD_CIMI );
    app_error_flag = lteiot_rsp_check(  );
    lteiot_error_check( app_error_flag );
    Delay_ms ( 500 );

    app_buf_len = 0;
    app_buf_cnt = 0;
    app_connection_status = WAIT_FOR_CONNECTION;
    log_info( &logger, " Application Task " );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
    Delay_ms ( 1000 );
}

Application Task

Waits for device to connect to network and then sends SMS to selected phone number.

void application_task ( void )
{
    if ( app_connection_status == WAIT_FOR_CONNECTION )
    {
        // CGATT - request IMSI
        lteiot_send_cmd_check( &lteiot, LTEIOT_CMD_CGATT );
        app_error_flag = lteiot_rsp_check(  );
        lteiot_error_check( app_error_flag );
        Delay_ms ( 500 );

        // CEREG - network registration status
        lteiot_send_cmd_check( &lteiot, LTEIOT_CMD_CEREG );
        app_error_flag = lteiot_rsp_check(  );
        lteiot_error_check( app_error_flag );
        Delay_ms ( 500 );

        // CSQ - signal quality
        lteiot_send_cmd( &lteiot, LTEIOT_CMD_CSQ );
        app_error_flag = lteiot_rsp_check(  );
        lteiot_error_check( app_error_flag );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
    }
    else
    {
        log_info( &logger, "CONNECTED TO NETWORK" );

        // SMS message format - text mode
        lteiot_send_cmd_with_parameter( &lteiot, "AT+CMGF", "1" );
        app_error_flag = lteiot_rsp_check(  );
        lteiot_error_check( app_error_flag );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );

        for( ; ; )
        {   
            log_printf( &logger, "> Sending message to phone number...\r\n" );
            lteiot_send_text_message( &lteiot, PHONE_NUMBER_TO_MESSAGE, MESSAGE_CONTENT );
            app_error_flag = lteiot_rsp_check(  );
            lteiot_error_check( app_error_flag );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
        }
    }
} 

Note

In order for the example to work, user needs to set the phone number and sim apn to which he wants to send an SMS Enter valid data for the following macros: SIM_APN and PHONE_NUMBER_TO_MESSAGE.

E.g.

• SIM_APN "vipmobile"
• PHONE_NUMBER_TO_MESSAGE "999999999"

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.LteIot

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. The terminal available in all Mikroelektronika compilers, or any other terminal application of your choice, can be used to read the message.