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GSM 3 click

‍GSM3 click is a complete quad-band GSM cellular network communication solution, featuring the SIM800H-BT, a quad-band 2G GSM/GPRS module. This module is GSM Phase 2/2+ compliant, featuring a full set of options for the cellular networking and communication. It has a network status indication, jamming detection, embedded internet protocols including TCP/IP, UDP, FTP, PPP, HTTP, E-mail, MMS, and more. It also features advanced voice/audio functions, including the FM radio interface. The GPRS multislot class 12 implementation allows 4 uplink and 4 downlink slots, with 5 slots open in total.

click Product page

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Click library

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

Software Support

We provide a library for the GSM3 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 GSM3 Click driver.

Standard key functions :

• gsm3_cfg_setup Config Object Initialization function.

  void gsm3_cfg_setup ( gsm3_cfg_t *cfg );

• gsm3_init Initialization function.

  err_t gsm3_init ( gsm3_t *ctx, gsm3_cfg_t *cfg );

Example key functions :

• gsm3_set_sim_apn This function sets APN for sim card.

  void gsm3_set_sim_apn ( gsm3_t *ctx, uint8_t *sim_apn );

• gsm3_send_sms_text This function sends text message to a phone number.

  void gsm3_send_sms_text ( gsm3_t *ctx, uint8_t *phone_number, uint8_t *sms_text );

• gsm3_send_sms_pdu This function sends text message to a phone number in PDU mode.

  err_t gsm3_send_sms_pdu ( gsm3_t *ctx, uint8_t *service_center_number, uint8_t *phone_number, uint8_t *sms_text );

Example Description

‍Application example shows device capability of connecting to the network and sending SMS or TCP/UDP messages using standard "AT" commands.

The demo application is composed of two sections :

Application Init

‍Initializes the driver, tests the communication by sending "AT" command, and after that restarts the device.

void application_init ( void ) 
{
    log_cfg_t log_cfg;  
    gsm3_cfg_t gsm3_cfg;  
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );
 
    // Click initialization.
    gsm3_cfg_setup( &gsm3_cfg );
    GSM3_MAP_MIKROBUS( gsm3_cfg, MIKROBUS_1 );
    if ( UART_ERROR == gsm3_init( &gsm3, &gsm3_cfg ) )
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );
        for ( ; ; );
    }
    
    gsm3_process( );
    gsm3_clear_app_buf( );
 
    // Check communication
    gsm3_send_cmd( &gsm3, GSM3_CMD_AT );
    error_flag = gsm3_rsp_check( GSM3_RSP_OK );
    gsm3_error_check( error_flag );
    
    // Restart device
    #define RESTART_DEVICE "1,1"
    gsm3_send_cmd_with_par( &gsm3, GSM3_CMD_CFUN, RESTART_DEVICE );
    error_flag = gsm3_rsp_check( GSM3_RSP_OK );
    gsm3_error_check( error_flag );
    
    log_info( &logger, " Application Task " );
    example_state = GSM3_CONFIGURE_FOR_NETWORK;
}

Application Task

‍Application task is split in few stages:

• GSM3_CONFIGURE_FOR_NETWORK: Sets configuration to device to be able to connect to the network.
• GSM3_WAIT_FOR_CONNECTION: Waits for the network registration indicated via CREG URC event and then checks the connection status.
• GSM3_CONFIGURE_FOR_EXAMPLE: Sets the device configuration for sending SMS or TCP/UDP messages depending on the selected demo example.
• GSM3_EXAMPLE: Depending on the selected demo example, it sends an SMS message (in PDU or TXT mode) or TCP/UDP message. By default, the TCP/UDP example is selected.

void application_task ( void ) 
{
    switch ( example_state )
    {
        case GSM3_CONFIGURE_FOR_NETWORK:
        {
            if ( GSM3_OK == gsm3_configure_for_network( ) )
            {
                example_state = GSM3_WAIT_FOR_CONNECTION;
            }
            break;
        }
        case GSM3_WAIT_FOR_CONNECTION:
        {
            if ( GSM3_OK == gsm3_check_connection( ) )
            {
                example_state = GSM3_CONFIGURE_FOR_EXAMPLE;
            }
            break;
        }
        case GSM3_CONFIGURE_FOR_EXAMPLE:
        {
            if ( GSM3_OK == gsm3_configure_for_example( ) )
            {
                example_state = GSM3_EXAMPLE;
            }
            break;
        }
        case GSM3_EXAMPLE:
        {
            gsm3_example( );
            break;
        }
        default:
        {
            log_error( &logger, " Example state." );
            break;
        }
    }
}

Note

‍In order for the examples to work, user needs to set the APN and SMSC (SMS PDU mode only)

of entered SIM card as well as the phone number (SMS mode only) to which he wants to send an SMS. Enter valid values for the following macros: SIM_APN, SIM_SMSC and PHONE_NUMBER_TO_MESSAGE.

‍Example:

• SIM_APN "internet"
• SIM_SMSC "+381610401"
• PHONE_NUMBER_TO_MESSAGE "+381659999999"

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.GSM3

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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