使用SKY66430-11和TM4C129ENCPDT发现更智能的物联网连接方式

在物联网世界中保持领先

已发布 6月 25, 2024

点击板

LTE IoT 8 Click

开发板

Fusion for Tiva v8

编译器

NECTO Studio

微控制器单元

TM4C129ENCPDT

体验物联网通信的变革，LTE IoT通过集成CAT M1和NB1技术提供强大且面向未来的连接解决方案。

硬件概览

它是如何工作的？

LTE IoT 8 Click 基于SKY66430-11，这是一款为可穿戴设备、资产跟踪、工业监控和智能计量提供LTE-M和NB-IoT连接的紧凑低功耗5G就绪物联网SiP解决方案，由Skyworks Solutions和Sequans Communications提供。该SiP集成了RF前端、收发器、基带调制解调器、存储器和电源管理，提供从698到2200MHz的18个频段。它已经通过主要网络运营商、监管机构和标准组织的预认证，可快速进行全球部署。该设备支持高达300kbps的下载速度和375kbps的上传速度，支持LTE定位。它还具有同类最佳的“深度睡眠”功耗，仅为1uA，对于电池供电的物联网设备而言，这是一大优势。此外，它还具有100%基于软件的低功耗安全定位解决方案，可以在任何地方工作（在GPS无法工作的室内深处启用定位）。SKY66430-11通过

UART接口与MCU通信，使用常用的UART RX和TX引脚，以及硬件流控制引脚UART CTS、RTS、RI（发送就绪、接收就绪和振铃指示器）。默认配置下的工作速度为115200 bps，与主机MCU传输和交换数据。它还配备了一个USB Type C连接器，允许模块通过FT2232D（一个紧凑的USB转串行UART接口设备）由个人计算机（PC）供电和配置。此Click板™可以由电池供电并用作独立设备。它还包含MC34671，一款完全集成的锂离子或锂聚合物电池充电器，允许在Click板™插入mikroBUS™插座或插入USB端口时进行电池充电，充电进度通过CHG LED指示灯显示。当电池充满时，CHG LED将熄灭。此外，此Click板™还具有一个标记为STAT的额外黄色LED，用于指示模块的不同操作模式，而mikroBUS™插座上的PWM引脚

用作节能状态指示器。当调制解调器处于活动状态时，该指示器设置为高逻辑状态；当调制解调器处于低功耗模式时，设置为低逻辑状态。板载标记为ON的按钮连接到mikroBUS™的RST引脚，代表点火按钮。LTE IoT 8 Click具有50Ω阻抗的SMA天线连接器，用于连接MIKROE提供的适当天线。除了LTE SMA连接器外，此Click板™还具有一个Nano-SIM卡插槽，提供多种连接和接口选项。此Click板™可以与3.3V和5V的MCU一起工作。适当的电压电平转换由TXS0108E执行，确保适当的逻辑电压电平转换，而板载LDO确保电源模块的推荐电压水平。此外，该Click板™配备了包含易于使用的功能库和示例代码，可作为进一步开发的参考。

功能概述

开发板

Fusion for TIVA v8 是一款专为快速开发嵌入式应用的需求而特别设计的开发板。它支持广泛的微控制器，如不同的32位ARM® Cortex®-M基础MCUs，来自Texas Instruments，无论它们的引脚数量如何，并且具有一系列独特功能，例如首次通过WiFi网络实现的嵌入式调试器/程序员。开发板布局合理，设计周到，使得最终用户可以在一个地方找到所有必要的元素，如开关、按钮、指示灯、连接器等。得益于创新的制造技术，Fusion for TIVA v8 提供了流畅而沉浸式的工作体验，允许在任何情况下、任何地方、任何

时候都能访问。Fusion for TIVA v8开发板的每个部分都包含了使同一板块运行最高效的必要组件。一个先进的集成CODEGRIP程序/调试模块提供许多有价值的编程/调试选项，包括对JTAG、SWD和SWO Trace（单线输出）的支持，并与Mikroe软件环境无缝集成。此外，它还包括一个干净且调节过的开发板电源供应模块。它可以使用广泛的外部电源，包括电池、外部12V电源供应和通过USB Type-C（USB-C）连接器的电源。通信选项如USB-UART、USB HOST/DEVICE、CAN（如果MCU卡支持的话）和以

太网也包括在内。此外，它还拥有广受好评的 mikroBUS™标准，为MCU卡提供了标准化插座（SiBRAIN标准），以及两种显示选项，用于TFT板线产品和基于字符的LCD。Fusion for TIVA v8 是Mikroe快速开发生态系统的一个组成部分。它由Mikroe软件工具原生支持，得益于大量不同的Click板™（超过一千块板），其数量每天都在增长，它涵盖了原型制作和开发的许多方面。

微控制器概述

MCU卡片 / MCU

类型

8th Generation

建筑

ARM Cortex-M4

MCU 内存 (KB)

1024

硅供应商

Texas Instruments

引脚数

128

RAM (字节)

262144

你完善了我！

配件

LTE Flat Rotation Antenna 是提升3G/4G LTE设备性能的多功能选择。其宽频率范围为700-2700MHz，确保在全球主要蜂窝频段上的最佳连接。该平板天线配有SMA公连接器，便于直接连接到您的设备或SMA模块连接器。其突出特点之一是可调节角度，可按45⁰增量（0⁰/45⁰/90⁰）设置，允许您微调天线的方向以获得最佳信号接收。该天线具有50Ω的阻抗和小于2.0:1的电压驻波比，确保连接可靠且高效。其5dB增益、垂直极化和全向辐射模式增强了信号强度，适用于各种应用。天线长度为196mm，宽度为38mm，提供了紧凑而有效的连接解决方案。其最大输入功率为50W，能够满足各种设备的需求。

使用的MCU引脚

mikroBUS™映射器

UART RI

PD0

Ignition

PK3

RST

UART CTS

PH0

SCK

MISO

MOSI

Power Supply

3.3V

Ground

GND

Power-Saving Status

PL4

PWM

UART RTS

PQ4

INT

UART TX

PK1

UART RX

PK0

SCL

SDA

Power Supply

Ground

GND

“仔细看看！”

Click board™ 原理图

一步一步来

项目组装

Fusion for PIC v8 front image hardware assembly

从选择您的开发板和Click板™开始。以Fusion for Tiva v8作为您的开发板开始

GNSS2 Click front image hardware assembly

SiBRAIN for PIC32MZ1024EFK144 front image hardware assembly

GNSS2 Click complete accessories setup image hardware assembly

v8 SiBRAIN Access MB 1 - upright/background hardware assembly

NECTO Compiler Selection Step Image hardware assembly

NECTO Output Selection Step Image hardware assembly

实时跟踪您的结果

应用程序输出

1. 应用程序输出 - 在调试模式下，“应用程序输出”窗口支持实时数据监控，直接提供执行结果的可视化。请按照提供的教程正确配置环境，以确保数据正确显示。

2. UART 终端 - 使用UART Terminal通过USB to UART converter监视数据传输，实现Click board™与开发系统之间的直接通信。请根据项目需求配置波特率和其他串行设置，以确保正常运行。有关分步设置说明，请参考提供的教程。

3. Plot 输出 - Plot功能提供了一种强大的方式来可视化实时传感器数据，使趋势分析、调试和多个数据点的对比变得更加直观。要正确设置，请按照提供的教程，其中包含使用Plot功能显示Click board™读数的分步示例。在代码中使用Plot功能时，请使用以下函数：plot(insert_graph_name, variable_name);。这是一个通用格式，用户需要将“insert_graph_name”替换为实际图表名称，并将“variable_name”替换为要显示的参数。

软件支持

库描述

该库包含 LTE IoT 8 Click 驱动程序的 API。

关键功能:

lteiot8_send_cmd - 发送命令功能
lteiot8_set_sim_apn - 设置SIM APN
lteiot8_send_text_message - 以文本模式发送短信到指定号码

开源

代码示例

完整的应用程序代码和一个现成的项目可以通过NECTO Studio包管理器直接安装到NECTO Studio。应用程序代码也可以在MIKROE的GitHub账户中找到。

/*!
 * @file main.c
 * @brief LTE IoT 8 Click Example.
 *
 * # Description
 * Application example shows device capability to connect 
 * network and send SMS messages using standard "AT" commands.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initializes driver and wake-up module and test communication.
 *
 * ## Application Task
 * Application taks is split in few stages:
 *  - LTEIOT8_CONFIGURE_FOR_CONNECTION: 
 * Sets configuration to device to be able to connect to newtork.
 * 
 *  - LTEIOT8_WAIT_FOR_CONNECTION: 
 * Checks device response untill device sends information 
 * that it is connected to network.
 * 
 *  - LTEIOT8_CHECK_CONNECTION:
 * Checks device connection status parameters.
 * 
 *  - LTEIOT8_CONFIGURE_FOR_MESSAGES:
 * Sets configuration to device to send SMS messages.
 * 
 *  - LTEIOT8_MESSAGES:
 * Sends message in selected mode (PDU/TXT).
 *
 *
 * ## Additional Function
 * - static void lteiot8_clear_app_buf ( void )
 * - static err_t lteiot8_process ( void )
 * - static void lteiot8_error_check( err_t error_flag )
 * - static void lteiot8_log_app_buf ( void )
 * - static err_t lteiot8_rsp_check ( void )
 * - static err_t lteiot8_configure_for_connection( void )
 * - static err_t lteiot8_check_connection( void )
 * - static err_t lteiot8_check_connection_parameters( void )
 * - static err_t lteiot8_configure_for_meesages( void )
 * - static err_t lteiot8_send_meesage( void )
 * - 
 *
 * @note
 *  * In order for the example to work, user needs to set the phone number to which he wants 
 * to send an SMS, and also will need to set an APN and SMSC of entered SIM card.
 * Enter valid data for the following macros: SIM_APN, SIM_SMSC and PHONE_NUMBER_TO_MESSAGE.
 * E.g. 
 * SIM_APN                     "vip.iot"
 * SMSC_ADDRESS_CSCA           "\"+381999999\",145"
 * SMSC_ADDRESS_PDU            "+381999999\" 
 * PHONE_NUMBER_TO_MESSAGE     "+381659999999"
 *
 * @author Luka Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "lteiot8.h"

//Set valid SIM APN
#define SIM_APN                     ""
//Set Phone number to message
#define PHONE_NUMBER_TO_MESSAGE     "+381659999999"
//Messege content 
#define MESSAGE_CONTENT             "LTE IoT 8 Click"
//Set valid SMSC fro SIM
#define SMSC_ADDRESS_CSCA           "\"+381999999\",145" 
#define SMSC_ADDRESS_PDU            "+381999999" 

#define PROCESS_BUFFER_SIZE         300

/**
 * @brief Example states.
 * @details Predefined enum values for application example state.
 */
typedef enum
{
   LTEIOT8_CONFIGURE_FOR_CONNECTION = 1,
   LTEIOT8_WAIT_FOR_CONNECTION,
   LTEIOT8_CHECK_CONNECTION,
   LTEIOT8_CONFIGURE_FOR_MESSAGES,
   LTEIOT8_MESSAGES

} lteiot8_example_state_t;

static lteiot8_t lteiot8;
static log_t logger;

/**
 * @brief Application example variables.
 * @details Variables used in application example.
 */
static char app_buf[ PROCESS_BUFFER_SIZE ] = { 0 };
static int32_t app_buf_len = 0;
static int32_t app_buf_cnt = 0;
static err_t error_flag;
static lteiot8_example_state_t example_state;


/**
 * @brief Clearing application buffer.
 * @details This function clears memory of application 
 * buffer and reset it's length and counter.
 */
static void lteiot8_clear_app_buf ( void );

/**
 * @brief Data reading function.
 * @details This function reads data from device and 
 * appends data to application buffer.
 *
 * @return @li @c  0 - Read some data.
 *         @li @c -1 - Nothing is read.
 *         @li @c -2 - Application buffer overflow.
 *
 * See #err_t definition for detailed explanation.
 */
static err_t lteiot8_process ( void );

/**
 * @brief Check for errors.
 * @details This function checks for different types of 
 * errors and logs them on UART or logs the response if no errors occured.
 */
static void lteiot8_error_check( err_t error_flag );

/**
 * @brief Logs application buffer.
 * @details This function logs data from application buffer.
 */
static void lteiot8_log_app_buf ( void );

/**
 * @brief Response check.
 * @details This function checks for response and 
 * returns the status of response.
 * 
 * @return application status.
 * See #err_t definition for detailed explanation.
 */
static err_t lteiot8_rsp_check ( void );

/**
 * @brief Configure device for connection to the network.
 * @details Sends commands to configure and enable 
 * connection to the secifide network.
 */
static err_t lteiot8_configure_for_connection( void );

/**
 * @brief Whait for connection signal.
 * @details Wait for connection signal from CREG command.
 */
static err_t lteiot8_check_connection( void );

/**
 * @brief Check connection parameters.
 * @details This function checks connection parameters.
 */
static err_t lteiot8_check_connection_parameters( void );

/**
 * @brief Configure device for sending messages.
 * @details Configure device to send txt mode 
 * messages and SMSC of the SIM card.
 */
static err_t lteiot8_configure_for_meesages( void );

/**
 * @brief Sending text message.
 * @details This function sends text messages to predefined number.
 */
static err_t lteiot8_send_meesage( void );

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    lteiot8_cfg_t lteiot8_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 " );

    // Click initialization.
    lteiot8_cfg_setup( &lteiot8_cfg );
    LTEIOT8_MAP_MIKROBUS( lteiot8_cfg, MIKROBUS_1 );
    err_t init_flag  = lteiot8_init( &lteiot8, &lteiot8_cfg );
    if ( init_flag == UART_ERROR ) 
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }
    lteiot8_process();
    lteiot8_clear_app_buf(); 
    app_buf_len = 0;
    app_buf_cnt = 0;
    
    lteiot8_default_cfg ( &lteiot8 );
    while ( 0 == strstr( app_buf, LTEIOT8_RSP_SYSTART ) )
    {
        lteiot8_process();
    }
    
    //Check communication
    lteiot8_send_cmd( &lteiot8, "AT" );
    error_flag = lteiot8_rsp_check();
    lteiot8_error_check( error_flag );
    
    log_info( &logger, " Application Task " );
    example_state = LTEIOT8_CONFIGURE_FOR_CONNECTION;
}

void application_task ( void ) 
{
    switch ( example_state )
    {
        case LTEIOT8_CONFIGURE_FOR_CONNECTION:
        {
            if ( LTEIOT8_OK == lteiot8_configure_for_connection( ) )
            {
                example_state = LTEIOT8_WAIT_FOR_CONNECTION;
            }
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            break;
        }
        case LTEIOT8_WAIT_FOR_CONNECTION:
        {
            if ( LTEIOT8_OK == lteiot8_check_connection( ) )
            {
                example_state = LTEIOT8_CHECK_CONNECTION;
            }
            break;
        }
        case LTEIOT8_CHECK_CONNECTION:
        {
            if ( LTEIOT8_OK == lteiot8_check_connection_parameters( ) )
            {
                example_state = LTEIOT8_CONFIGURE_FOR_MESSAGES;
            }
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            break;
        }
        case LTEIOT8_CONFIGURE_FOR_MESSAGES:
        {
            if ( LTEIOT8_OK == lteiot8_configure_for_meesages( ) )
            {
                example_state = LTEIOT8_MESSAGES;
            }
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            break;
        }
        case LTEIOT8_MESSAGES:
        {
            lteiot8_send_meesage();
            // 10 seconds delay
            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 );
            break;
        }
        default:
        {
            log_error( &logger, " Example state." );
            break;
        }
    }
}

int main ( void ) 
{
    /* Do not remove this line or clock might not be set correctly. */
    #ifdef PREINIT_SUPPORTED
    preinit();
    #endif
    
    application_init( );
    
    for ( ; ; ) 
    {
        application_task( );
    }

    return 0;
}

static void lteiot8_clear_app_buf ( void ) 
{
    memset( app_buf, 0, app_buf_len );
    app_buf_len = 0;
    app_buf_cnt = 0;
}

static err_t lteiot8_process ( void ) 
{
    int32_t rx_size;
    char rx_buff[ PROCESS_BUFFER_SIZE ] = { 0 };

    rx_size = lteiot8_generic_read( &lteiot8, rx_buff, PROCESS_BUFFER_SIZE );

    if ( rx_size > 0 ) 
    {
        int32_t buf_cnt = 0;

        if ( app_buf_len + rx_size >= PROCESS_BUFFER_SIZE ) 
        {
           lteiot8_clear_app_buf(  );
            return LTEIOT8_ERROR;
        } 
        else 
        {
            buf_cnt = app_buf_len;
            app_buf_len += rx_size;
        }

        for ( int32_t rx_cnt = 0; rx_cnt < rx_size; rx_cnt++ ) 
        {
            if ( rx_buff[ rx_cnt ] != 0 ) 
            {
                app_buf[ ( buf_cnt + rx_cnt ) ] = rx_buff[ rx_cnt ];
            }
            else
            {
                app_buf_len--;
                buf_cnt--;
            }

        }
        return LTEIOT8_OK;
    }
    return LTEIOT8_ERROR;
}

static err_t lteiot8_rsp_check ( void )
{
    uint16_t timeout_cnt = 0;
    uint16_t timeout = 10000;
    
    err_t error_flag = lteiot8_process(  );
    if ( ( error_flag != 0 ) && ( error_flag != -1 ) )
    {
        return error_flag;
    }
    
    while ( ( 0 == strstr( app_buf, LTEIOT8_RSP_OK ) ) && 
            ( 0 == strstr( app_buf, LTEIOT8_RSP_ERROR ) ) )
    {
        error_flag = lteiot8_process(  );
        if ( ( error_flag != 0 ) && ( error_flag != -1 ) )
        {
            return error_flag;
        }
        
        timeout_cnt++;
        if ( timeout_cnt > timeout )
        {
            lteiot8_clear_app_buf(  );
            return LTEIOT8_ERROR_TIMEOUT;
        }
        
        Delay_ms ( 1 );
    }
    
    if ( 0 != strstr( app_buf, LTEIOT8_RSP_OK ) )
    {
        return LTEIOT8_OK;
    }
    else if ( 0 == strstr( app_buf, LTEIOT8_RSP_ERROR ) )
    {
        return LTEIOT8_ERROR_CMD;
    }
    else
    {
        return LTEIOT8_ERROR_UNKNOWN;
    }
}

static void lteiot8_error_check( err_t error_flag )
{
    switch ( error_flag )
    {
        case LTEIOT8_OK:
        {
            lteiot8_log_app_buf( );
            break;
        }
        case LTEIOT8_ERROR:
        {
            log_error( &logger, " Overflow!" );
            break;
        }
        case LTEIOT8_ERROR_TIMEOUT:
        {
            log_error( &logger, " Timeout!" );
            break;
        }
        case LTEIOT8_ERROR_CMD:
        {
            log_error( &logger, " CMD!" );
            break;
        }
        case LTEIOT8_ERROR_UNKNOWN:
        default:
        {
            log_error( &logger, " Unknown!" );
            break;
        }
    }
    lteiot8_clear_app_buf(  );
    Delay_ms ( 500 );
}

static void lteiot8_log_app_buf ( void )
{
    for ( int32_t buf_cnt = 0; buf_cnt < app_buf_len; buf_cnt++ )
    {
        log_printf( &logger, "%c", app_buf[ buf_cnt ] );
    }
}

static err_t lteiot8_configure_for_connection( void )
{
    err_t func_error = LTEIOT8_OK;
    
    //Enable full functionality
    #define FULL_FUNCTIONALITY "1"
    lteiot8_send_cmd_with_parameter( &lteiot8, LTEIOT8_CMD_CFUN, FULL_FUNCTIONALITY );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    //Enable device LED
    #define GNSS_LEN "1"
    lteiot8_send_cmd_with_parameter( &lteiot8, LTEIOT8_CMD_SQNLED, GNSS_LEN );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    //Set SIM APN
    lteiot8_set_sim_apn( &lteiot8, SIM_APN );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    //Automatic configure cops
    #define AUTOMATIC "0"
    lteiot8_send_cmd_with_parameter( &lteiot8, LTEIOT8_CMD_COPS, AUTOMATIC );
    error_flag = lteiot8_rsp_check(); 
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    //Enable network registartion
    #define ENABLE_REG "2"
    lteiot8_send_cmd_with_parameter( &lteiot8, LTEIOT8_CMD_CEREG, ENABLE_REG );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    return func_error;
}

static err_t lteiot8_check_connection( void )
{
    #define CONNECTED "+CEREG: 1"
    lteiot8_process();
    if ( 0 != strstr(app_buf, CONNECTED ) )
    {
        Delay_ms ( 100 );
        lteiot8_process();
        lteiot8_log_app_buf( );
        lteiot8_clear_app_buf(  );
        return LTEIOT8_OK;
    }
    
    return LTEIOT8_ERROR;
}

static err_t lteiot8_check_connection_parameters( void )
{
    err_t func_error = LTEIOT8_OK;
    
    //Check if connected
    lteiot8_send_cmd_check( &lteiot8, LTEIOT8_CMD_CGATT );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    //Check registration
    lteiot8_send_cmd_check( &lteiot8, LTEIOT8_CMD_CEREG );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    //Check signal quality
    lteiot8_send_cmd( &lteiot8, LTEIOT8_CMD_CSQ );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    return func_error;
}

static err_t lteiot8_configure_for_meesages( void )
{
    err_t func_error = LTEIOT8_OK;
    
    //Set message mode
    #define PDU_MESSAGE_MODE "0"
    #define TXT_MESSAGE_MODE "1"
    lteiot8_send_cmd_with_parameter( &lteiot8, LTEIOT8_CMD_CMGF, TXT_MESSAGE_MODE );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    //Set SMSC for SIM card
    lteiot8_send_cmd_with_parameter( &lteiot8, LTEIOT8_CMD_CSCA, SMSC_ADDRESS_CSCA );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );

    return func_error;
}

static err_t lteiot8_send_meesage( void )
{
    #define CMGF_PDU "+CMGF: 0"
    #define CMGF_TXT "+CMGF: 1"
    
    //Sendind message  
    lteiot8_send_cmd_check( &lteiot8, LTEIOT8_CMD_CMGF );
    error_flag = lteiot8_rsp_check();
    
    if ( 0 != strstr( app_buf, CMGF_PDU ) )
    {
        lteiot8_clear_app_buf(  );
        lteiot8_send_sms_pdu( &lteiot8, SMSC_ADDRESS_PDU, PHONE_NUMBER_TO_MESSAGE, MESSAGE_CONTENT );
        error_flag = lteiot8_rsp_check();
        lteiot8_error_check( error_flag );
    }
    else if ( 0 != strstr( app_buf, CMGF_TXT ) )
    {
        lteiot8_clear_app_buf(  );
        lteiot8_send_text_message( &lteiot8, PHONE_NUMBER_TO_MESSAGE, MESSAGE_CONTENT );
        error_flag = lteiot8_rsp_check();
        lteiot8_error_check( error_flag );
    }
    
    return error_flag;
}


// ------------------------------------------------------------------------ END

/*!
 * @file main.c
 * @brief LTE IoT 8 Click Example.
 *
 * # Description
 * Application example shows device capability to connect 
 * network and send SMS messages using standard "AT" commands.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initializes driver and wake-up module and test communication.
 *
 * ## Application Task
 * Application taks is split in few stages:
 *  - LTEIOT8_CONFIGURE_FOR_CONNECTION: 
 * Sets configuration to device to be able to connect to newtork.
 * 
 *  - LTEIOT8_WAIT_FOR_CONNECTION: 
 * Checks device response untill device sends information 
 * that it is connected to network.
 * 
 *  - LTEIOT8_CHECK_CONNECTION:
 * Checks device connection status parameters.
 * 
 *  - LTEIOT8_CONFIGURE_FOR_MESSAGES:
 * Sets configuration to device to send SMS messages.
 * 
 *  - LTEIOT8_MESSAGES:
 * Sends message in selected mode (PDU/TXT).
 *
 *
 * ## Additional Function
 * - static void lteiot8_clear_app_buf ( void )
 * - static err_t lteiot8_process ( void )
 * - static void lteiot8_error_check( err_t error_flag )
 * - static void lteiot8_log_app_buf ( void )
 * - static err_t lteiot8_rsp_check ( void )
 * - static err_t lteiot8_configure_for_connection( void )
 * - static err_t lteiot8_check_connection( void )
 * - static err_t lteiot8_check_connection_parameters( void )
 * - static err_t lteiot8_configure_for_meesages( void )
 * - static err_t lteiot8_send_meesage( void )
 * - 
 *
 * @note
 *  * In order for the example to work, user needs to set the phone number to which he wants 
 * to send an SMS, and also will need to set an APN and SMSC of entered SIM card.
 * Enter valid data for the following macros: SIM_APN, SIM_SMSC and PHONE_NUMBER_TO_MESSAGE.
 * E.g. 
 * SIM_APN                     "vip.iot"
 * SMSC_ADDRESS_CSCA           "\"+381999999\",145"
 * SMSC_ADDRESS_PDU            "+381999999\" 
 * PHONE_NUMBER_TO_MESSAGE     "+381659999999"
 *
 * @author Luka Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "lteiot8.h"

//Set valid SIM APN
#define SIM_APN                     ""
//Set Phone number to message
#define PHONE_NUMBER_TO_MESSAGE     "+381659999999"
//Messege content 
#define MESSAGE_CONTENT             "LTE IoT 8 Click"
//Set valid SMSC fro SIM
#define SMSC_ADDRESS_CSCA           "\"+381999999\",145" 
#define SMSC_ADDRESS_PDU            "+381999999" 

#define PROCESS_BUFFER_SIZE         300

/**
 * @brief Example states.
 * @details Predefined enum values for application example state.
 */
typedef enum
{
   LTEIOT8_CONFIGURE_FOR_CONNECTION = 1,
   LTEIOT8_WAIT_FOR_CONNECTION,
   LTEIOT8_CHECK_CONNECTION,
   LTEIOT8_CONFIGURE_FOR_MESSAGES,
   LTEIOT8_MESSAGES

} lteiot8_example_state_t;

static lteiot8_t lteiot8;
static log_t logger;

/**
 * @brief Application example variables.
 * @details Variables used in application example.
 */
static char app_buf[ PROCESS_BUFFER_SIZE ] = { 0 };
static int32_t app_buf_len = 0;
static int32_t app_buf_cnt = 0;
static err_t error_flag;
static lteiot8_example_state_t example_state;


/**
 * @brief Clearing application buffer.
 * @details This function clears memory of application 
 * buffer and reset it's length and counter.
 */
static void lteiot8_clear_app_buf ( void );

/**
 * @brief Data reading function.
 * @details This function reads data from device and 
 * appends data to application buffer.
 *
 * @return @li @c  0 - Read some data.
 *         @li @c -1 - Nothing is read.
 *         @li @c -2 - Application buffer overflow.
 *
 * See #err_t definition for detailed explanation.
 */
static err_t lteiot8_process ( void );

/**
 * @brief Check for errors.
 * @details This function checks for different types of 
 * errors and logs them on UART or logs the response if no errors occured.
 */
static void lteiot8_error_check( err_t error_flag );

/**
 * @brief Logs application buffer.
 * @details This function logs data from application buffer.
 */
static void lteiot8_log_app_buf ( void );

/**
 * @brief Response check.
 * @details This function checks for response and 
 * returns the status of response.
 * 
 * @return application status.
 * See #err_t definition for detailed explanation.
 */
static err_t lteiot8_rsp_check ( void );

/**
 * @brief Configure device for connection to the network.
 * @details Sends commands to configure and enable 
 * connection to the secifide network.
 */
static err_t lteiot8_configure_for_connection( void );

/**
 * @brief Whait for connection signal.
 * @details Wait for connection signal from CREG command.
 */
static err_t lteiot8_check_connection( void );

/**
 * @brief Check connection parameters.
 * @details This function checks connection parameters.
 */
static err_t lteiot8_check_connection_parameters( void );

/**
 * @brief Configure device for sending messages.
 * @details Configure device to send txt mode 
 * messages and SMSC of the SIM card.
 */
static err_t lteiot8_configure_for_meesages( void );

/**
 * @brief Sending text message.
 * @details This function sends text messages to predefined number.
 */
static err_t lteiot8_send_meesage( void );

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    lteiot8_cfg_t lteiot8_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 " );

    // Click initialization.
    lteiot8_cfg_setup( &lteiot8_cfg );
    LTEIOT8_MAP_MIKROBUS( lteiot8_cfg, MIKROBUS_1 );
    err_t init_flag  = lteiot8_init( &lteiot8, &lteiot8_cfg );
    if ( init_flag == UART_ERROR ) 
    {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }
    lteiot8_process();
    lteiot8_clear_app_buf(); 
    app_buf_len = 0;
    app_buf_cnt = 0;
    
    lteiot8_default_cfg ( &lteiot8 );
    while ( 0 == strstr( app_buf, LTEIOT8_RSP_SYSTART ) )
    {
        lteiot8_process();
    }
    
    //Check communication
    lteiot8_send_cmd( &lteiot8, "AT" );
    error_flag = lteiot8_rsp_check();
    lteiot8_error_check( error_flag );
    
    log_info( &logger, " Application Task " );
    example_state = LTEIOT8_CONFIGURE_FOR_CONNECTION;
}

void application_task ( void ) 
{
    switch ( example_state )
    {
        case LTEIOT8_CONFIGURE_FOR_CONNECTION:
        {
            if ( LTEIOT8_OK == lteiot8_configure_for_connection( ) )
            {
                example_state = LTEIOT8_WAIT_FOR_CONNECTION;
            }
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            break;
        }
        case LTEIOT8_WAIT_FOR_CONNECTION:
        {
            if ( LTEIOT8_OK == lteiot8_check_connection( ) )
            {
                example_state = LTEIOT8_CHECK_CONNECTION;
            }
            break;
        }
        case LTEIOT8_CHECK_CONNECTION:
        {
            if ( LTEIOT8_OK == lteiot8_check_connection_parameters( ) )
            {
                example_state = LTEIOT8_CONFIGURE_FOR_MESSAGES;
            }
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            break;
        }
        case LTEIOT8_CONFIGURE_FOR_MESSAGES:
        {
            if ( LTEIOT8_OK == lteiot8_configure_for_meesages( ) )
            {
                example_state = LTEIOT8_MESSAGES;
            }
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            Delay_ms ( 1000 );
            break;
        }
        case LTEIOT8_MESSAGES:
        {
            lteiot8_send_meesage();
            // 10 seconds delay
            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 );
            break;
        }
        default:
        {
            log_error( &logger, " Example state." );
            break;
        }
    }
}

int main ( void ) 
{
    /* Do not remove this line or clock might not be set correctly. */
    #ifdef PREINIT_SUPPORTED
    preinit();
    #endif
    
    application_init( );
    
    for ( ; ; ) 
    {
        application_task( );
    }

    return 0;
}

static void lteiot8_clear_app_buf ( void ) 
{
    memset( app_buf, 0, app_buf_len );
    app_buf_len = 0;
    app_buf_cnt = 0;
}

static err_t lteiot8_process ( void ) 
{
    int32_t rx_size;
    char rx_buff[ PROCESS_BUFFER_SIZE ] = { 0 };

    rx_size = lteiot8_generic_read( &lteiot8, rx_buff, PROCESS_BUFFER_SIZE );

    if ( rx_size > 0 ) 
    {
        int32_t buf_cnt = 0;

        if ( app_buf_len + rx_size >= PROCESS_BUFFER_SIZE ) 
        {
           lteiot8_clear_app_buf(  );
            return LTEIOT8_ERROR;
        } 
        else 
        {
            buf_cnt = app_buf_len;
            app_buf_len += rx_size;
        }

        for ( int32_t rx_cnt = 0; rx_cnt < rx_size; rx_cnt++ ) 
        {
            if ( rx_buff[ rx_cnt ] != 0 ) 
            {
                app_buf[ ( buf_cnt + rx_cnt ) ] = rx_buff[ rx_cnt ];
            }
            else
            {
                app_buf_len--;
                buf_cnt--;
            }

        }
        return LTEIOT8_OK;
    }
    return LTEIOT8_ERROR;
}

static err_t lteiot8_rsp_check ( void )
{
    uint16_t timeout_cnt = 0;
    uint16_t timeout = 10000;
    
    err_t error_flag = lteiot8_process(  );
    if ( ( error_flag != 0 ) && ( error_flag != -1 ) )
    {
        return error_flag;
    }
    
    while ( ( 0 == strstr( app_buf, LTEIOT8_RSP_OK ) ) && 
            ( 0 == strstr( app_buf, LTEIOT8_RSP_ERROR ) ) )
    {
        error_flag = lteiot8_process(  );
        if ( ( error_flag != 0 ) && ( error_flag != -1 ) )
        {
            return error_flag;
        }
        
        timeout_cnt++;
        if ( timeout_cnt > timeout )
        {
            lteiot8_clear_app_buf(  );
            return LTEIOT8_ERROR_TIMEOUT;
        }
        
        Delay_ms ( 1 );
    }
    
    if ( 0 != strstr( app_buf, LTEIOT8_RSP_OK ) )
    {
        return LTEIOT8_OK;
    }
    else if ( 0 == strstr( app_buf, LTEIOT8_RSP_ERROR ) )
    {
        return LTEIOT8_ERROR_CMD;
    }
    else
    {
        return LTEIOT8_ERROR_UNKNOWN;
    }
}

static void lteiot8_error_check( err_t error_flag )
{
    switch ( error_flag )
    {
        case LTEIOT8_OK:
        {
            lteiot8_log_app_buf( );
            break;
        }
        case LTEIOT8_ERROR:
        {
            log_error( &logger, " Overflow!" );
            break;
        }
        case LTEIOT8_ERROR_TIMEOUT:
        {
            log_error( &logger, " Timeout!" );
            break;
        }
        case LTEIOT8_ERROR_CMD:
        {
            log_error( &logger, " CMD!" );
            break;
        }
        case LTEIOT8_ERROR_UNKNOWN:
        default:
        {
            log_error( &logger, " Unknown!" );
            break;
        }
    }
    lteiot8_clear_app_buf(  );
    Delay_ms ( 500 );
}

static void lteiot8_log_app_buf ( void )
{
    for ( int32_t buf_cnt = 0; buf_cnt < app_buf_len; buf_cnt++ )
    {
        log_printf( &logger, "%c", app_buf[ buf_cnt ] );
    }
}

static err_t lteiot8_configure_for_connection( void )
{
    err_t func_error = LTEIOT8_OK;
    
    //Enable full functionality
    #define FULL_FUNCTIONALITY "1"
    lteiot8_send_cmd_with_parameter( &lteiot8, LTEIOT8_CMD_CFUN, FULL_FUNCTIONALITY );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    //Enable device LED
    #define GNSS_LEN "1"
    lteiot8_send_cmd_with_parameter( &lteiot8, LTEIOT8_CMD_SQNLED, GNSS_LEN );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    //Set SIM APN
    lteiot8_set_sim_apn( &lteiot8, SIM_APN );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    //Automatic configure cops
    #define AUTOMATIC "0"
    lteiot8_send_cmd_with_parameter( &lteiot8, LTEIOT8_CMD_COPS, AUTOMATIC );
    error_flag = lteiot8_rsp_check(); 
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    //Enable network registartion
    #define ENABLE_REG "2"
    lteiot8_send_cmd_with_parameter( &lteiot8, LTEIOT8_CMD_CEREG, ENABLE_REG );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    return func_error;
}

static err_t lteiot8_check_connection( void )
{
    #define CONNECTED "+CEREG: 1"
    lteiot8_process();
    if ( 0 != strstr(app_buf, CONNECTED ) )
    {
        Delay_ms ( 100 );
        lteiot8_process();
        lteiot8_log_app_buf( );
        lteiot8_clear_app_buf(  );
        return LTEIOT8_OK;
    }
    
    return LTEIOT8_ERROR;
}

static err_t lteiot8_check_connection_parameters( void )
{
    err_t func_error = LTEIOT8_OK;
    
    //Check if connected
    lteiot8_send_cmd_check( &lteiot8, LTEIOT8_CMD_CGATT );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    //Check registration
    lteiot8_send_cmd_check( &lteiot8, LTEIOT8_CMD_CEREG );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    //Check signal quality
    lteiot8_send_cmd( &lteiot8, LTEIOT8_CMD_CSQ );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    return func_error;
}

static err_t lteiot8_configure_for_meesages( void )
{
    err_t func_error = LTEIOT8_OK;
    
    //Set message mode
    #define PDU_MESSAGE_MODE "0"
    #define TXT_MESSAGE_MODE "1"
    lteiot8_send_cmd_with_parameter( &lteiot8, LTEIOT8_CMD_CMGF, TXT_MESSAGE_MODE );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );
    
    //Set SMSC for SIM card
    lteiot8_send_cmd_with_parameter( &lteiot8, LTEIOT8_CMD_CSCA, SMSC_ADDRESS_CSCA );
    error_flag = lteiot8_rsp_check();
    func_error |= error_flag;
    lteiot8_error_check( error_flag );

    return func_error;
}

static err_t lteiot8_send_meesage( void )
{
    #define CMGF_PDU "+CMGF: 0"
    #define CMGF_TXT "+CMGF: 1"
    
    //Sendind message  
    lteiot8_send_cmd_check( &lteiot8, LTEIOT8_CMD_CMGF );
    error_flag = lteiot8_rsp_check();
    
    if ( 0 != strstr( app_buf, CMGF_PDU ) )
    {
        lteiot8_clear_app_buf(  );
        lteiot8_send_sms_pdu( &lteiot8, SMSC_ADDRESS_PDU, PHONE_NUMBER_TO_MESSAGE, MESSAGE_CONTENT );
        error_flag = lteiot8_rsp_check();
        lteiot8_error_check( error_flag );
    }
    else if ( 0 != strstr( app_buf, CMGF_TXT ) )
    {
        lteiot8_clear_app_buf(  );
        lteiot8_send_text_message( &lteiot8, PHONE_NUMBER_TO_MESSAGE, MESSAGE_CONTENT );
        error_flag = lteiot8_rsp_check();
        lteiot8_error_check( error_flag );
    }
    
    return error_flag;
}


// ------------------------------------------------------------------------ END