File content as of revision 10:f3b1186fc0b0:

/*
 / _____)             _              | |
( (____  _____ ____ _| |_ _____  ____| |__
 \____ \| ___ |    (_   _) ___ |/ ___)  _ \
 _____) ) ____| | | || |_| ____( (___| | | |
(______/|_____)_|_|_| \__)_____)\____)_| |_|
    (C)2015 Semtech

Description: LoRaMac classA device implementation

License: Revised BSD License, see LICENSE.TXT file include in the project

Maintainer: Miguel Luis and Gregory Cristian
*/
#include "mbed.h"
#include "board.h"
#include "radio.h"

#include "LoRaMac.h"
#include "Commissioning.h"

#include "Si7021.h"
#include "stm32l0xx_hal_iwdg.h"

/*!
 * Defines the application data transmission duty cycle. 5s, value in [ms].
 */
#define APP_TX_DUTYCYCLE                            5000

/*!
 * Defines a random delay for application data transmission duty cycle. 1s,
 * value in [ms].
 */
#define APP_TX_DUTYCYCLE_RND                        1000

/*!
 * Default datarate
 */
#define LORAWAN_DEFAULT_DATARATE                    DR_0

/*!
 * LoRaWAN confirmed messages
 */
#define LORAWAN_CONFIRMED_MSG_ON                    true

/*!
 * LoRaWAN Adaptive Data Rate
 *
 * \remark Please note that when ADR is enabled the end-device should be static
 */
#define LORAWAN_ADR_ON                              1

#if defined( USE_BAND_868 )

#include "LoRaMacTest.h"

/*!
 * LoRaWAN ETSI duty cycle control enable/disable
 *
 * \remark Please note that ETSI mandates duty cycled transmissions. Use only for test purposes
 */
#define LORAWAN_DUTYCYCLE_ON                        false

#define USE_SEMTECH_DEFAULT_CHANNEL_LINEUP          1

#if( USE_SEMTECH_DEFAULT_CHANNEL_LINEUP == 1 )

#define LC4                { 867100000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
#define LC5                { 867300000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
#define LC6                { 867500000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
#define LC7                { 867700000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
#define LC8                { 867900000, { ( ( DR_5 << 4 ) | DR_0 ) }, 0 }
#define LC9                { 868800000, { ( ( DR_7 << 4 ) | DR_7 ) }, 2 }
#define LC10               { 868300000, { ( ( DR_6 << 4 ) | DR_6 ) }, 1 }

#endif

#endif

/*!
 * LoRaWAN application port
 */
#define LORAWAN_APP_PORT                            15

/*!
 * User application data buffer size
 */
#define LORAWAN_APP_DATA_SIZE                       7

static uint8_t DevEui[] = LORAWAN_DEVICE_EUI;
static uint8_t AppEui[] = LORAWAN_APPLICATION_EUI;
static uint8_t AppKey[] = LORAWAN_APPLICATION_KEY;

#if( OVER_THE_AIR_ACTIVATION == 0 )

static uint8_t NwkSKey[] = LORAWAN_NWKSKEY;
static uint8_t AppSKey[] = LORAWAN_APPSKEY;

/*!
 * Device address
 */
static uint32_t DevAddr = LORAWAN_DEVICE_ADDRESS;

#endif

/*!
 * Application port
 */
static uint8_t AppPort = LORAWAN_APP_PORT;

/*!
 * User application data size
 */
static uint8_t AppDataSize = LORAWAN_APP_DATA_SIZE;

/*!
 * User application data buffer size
 */
#define LORAWAN_APP_DATA_MAX_SIZE                           64

/*!
 * User application data
 */
static uint8_t AppData[LORAWAN_APP_DATA_MAX_SIZE];

/*!
 * Indicates if the node is sending confirmed or unconfirmed messages
 */
static uint8_t IsTxConfirmed = LORAWAN_CONFIRMED_MSG_ON;

/*!
 * Defines the application data transmission duty cycle
 */
static uint32_t TxDutyCycleTime;

/*!
 * Timer to handle the application data transmission duty cycle
 */
static TimerEvent_t TxNextPacketTimer;

/*!
 * Indicates if a new packet can be sent
 */
static bool NextTx = true;

// Serial
Serial pc(SERIAL_TX, SERIAL_RX,115200);

// Humidty&Temp Sensor
DigitalOut si7021_power_pin(PB_2);
Si7021 *si7021;


// I2C Definition
I2C i2c(PB_9, PB_8); //sda, scl

IWDG_HandleTypeDef wd;
bool joining;
time_t current_time;
time_t last_rx;

// Pressure

// The amount of time between measurements (seconds)
#define MEASUREMENT_GAP_SECONDS                               30

#define RAW_MEASUREMENT_BUFFER_SIZE                           10

// The moving average of the avg measurement data
float average_pressure;

// The raw pressure data of a single standard measurement
float raw_pressure_measurements[RAW_MEASUREMENT_BUFFER_SIZE] = {0};
int raw_measurement_counter = 0;

char single_measure_command[2] = {0x36, 0x2F};
char reset_command[1] = {0x06};

/*!
 * Device states
 */
static enum eDeviceState
{
    DEVICE_STATE_INIT,
    DEVICE_STATE_JOIN,
    DEVICE_STATE_SEND,
    DEVICE_STATE_CYCLE,
    DEVICE_STATE_SLEEP
}DeviceState;

static enum eMessageType
{
    MESSAGE_TYPE_ACK,
    MESSAGE_TYPE_READING
}MessageType;

/*!
 * LoRaWAN compliance tests support data
 */
struct ComplianceTest_s
{
    bool Running;
    uint8_t State;
    bool IsTxConfirmed;
    uint8_t AppPort;
    uint8_t AppDataSize;
    uint8_t *AppDataBuffer;
    uint16_t DownLinkCounter;
    bool LinkCheck;
    uint8_t DemodMargin;
    uint8_t NbGateways;
}ComplianceTest;

/*
 * SerialDisplay managment variables
 */

/*!
 * Indicates if the MAC layer network join status has changed.
 */
static bool IsNetworkJoinedStatusUpdate = false;

/*!
 * Strucure containing the Uplink status
 */
struct sLoRaMacUplinkStatus
{
    uint8_t Acked;
    int8_t Datarate;
    uint16_t UplinkCounter;
    uint8_t Port;
    uint8_t *Buffer;
    uint8_t BufferSize;
}LoRaMacUplinkStatus;
volatile bool UplinkStatusUpdated = false;

/*!
 * Strucure containing the Downlink status
 */
struct sLoRaMacDownlinkStatus
{
    int16_t Rssi;
    int8_t Snr;
    uint16_t DownlinkCounter;
    bool RxData;
    uint8_t Port;
    uint8_t *Buffer;
    uint8_t BufferSize;
}LoRaMacDownlinkStatus;
volatile bool DownlinkStatusUpdated = false;


/*!
 * \brief   Prepares the payload of the frame
 */
static void PrepareTxFrame( uint8_t port )
{
    switch( port )
    {
    case 15:
          {
              switch ( MessageType )
              {
                  case MESSAGE_TYPE_ACK:
                  {
                      AppDataSize = 0;
                      IsTxConfirmed = false;
                      break;
                  }
                  case MESSAGE_TYPE_READING:
                  default:
                  {
                      AppDataSize = 7;
                      IsTxConfirmed = true;

                      // Maximum +- 300 Pa
                      int16_t extended_pressure = (int16_t)(average_pressure * 100);
                      int16_t extended_humidity = (int16_t)(si7021->get_humidity() / 10);
                      int16_t extended_temp = (int16_t)(si7021->get_temperature() / 10);
                      pc.printf("Sending Pressure: %i\r\n", extended_pressure);
                      pc.printf("Sending Humidity: %i\r\n", extended_humidity);
                      pc.printf("Sending Temp: %i\r\n", extended_temp);

                      AppData[0] = 0xA0;
                      AppData[1] = extended_pressure >> 8;
                      AppData[2] = extended_pressure;
                      AppData[3] = extended_humidity >> 8;
                      AppData[4] = extended_humidity;
                      AppData[5] = extended_temp >> 8;
                      AppData[6] = extended_temp;
                      break;
                  }
              }
          }
        break;
    case 224:
        if( ComplianceTest.LinkCheck == true )
        {
            ComplianceTest.LinkCheck = false;
            AppDataSize = 3;
            AppData[0] = 5;
            AppData[1] = ComplianceTest.DemodMargin;
            AppData[2] = ComplianceTest.NbGateways;
            ComplianceTest.State = 1;
        }
        else
        {
            switch( ComplianceTest.State )
            {
            case 4:
                ComplianceTest.State = 1;
                break;
            case 1:
                AppDataSize = 2;
                AppData[0] = ComplianceTest.DownLinkCounter >> 8;
                AppData[1] = ComplianceTest.DownLinkCounter;
                break;
            }
        }
        break;
    default:
        break;
    }
}

/*!
 * \brief   Prepares the payload of the frame
 *
 * \retval  [0: frame could be send, 1: error]
 */
static bool SendFrame( void )
{
    McpsReq_t mcpsReq;
    LoRaMacTxInfo_t txInfo;

    if( LoRaMacQueryTxPossible( AppDataSize, &txInfo ) != LORAMAC_STATUS_OK )
    {
        // Send empty frame in order to flush MAC commands
        mcpsReq.Type = MCPS_UNCONFIRMED;
        mcpsReq.Req.Unconfirmed.fBuffer = NULL;
        mcpsReq.Req.Unconfirmed.fBufferSize = 0;
        mcpsReq.Req.Unconfirmed.Datarate = LORAWAN_DEFAULT_DATARATE;

        LoRaMacUplinkStatus.Acked = false;
        LoRaMacUplinkStatus.Port = 0;
        LoRaMacUplinkStatus.Buffer = NULL;
        LoRaMacUplinkStatus.BufferSize = 0;
    }
    else
    {
        LoRaMacUplinkStatus.Acked = false;
        LoRaMacUplinkStatus.Port = AppPort;
        LoRaMacUplinkStatus.Buffer = AppData;
        LoRaMacUplinkStatus.BufferSize = AppDataSize;

        if( IsTxConfirmed == false )
        {
            mcpsReq.Type = MCPS_UNCONFIRMED;
            mcpsReq.Req.Unconfirmed.fPort = AppPort;
            mcpsReq.Req.Unconfirmed.fBuffer = AppData;
            mcpsReq.Req.Unconfirmed.fBufferSize = AppDataSize;
            mcpsReq.Req.Unconfirmed.Datarate = LORAWAN_DEFAULT_DATARATE;
        }
        else
        {
            mcpsReq.Type = MCPS_CONFIRMED;
            mcpsReq.Req.Confirmed.fPort = AppPort;
            mcpsReq.Req.Confirmed.fBuffer = AppData;
            mcpsReq.Req.Confirmed.fBufferSize = AppDataSize;
            mcpsReq.Req.Confirmed.NbTrials = 8;
            mcpsReq.Req.Confirmed.Datarate = LORAWAN_DEFAULT_DATARATE;
        }
    }

    if( LoRaMacMcpsRequest( &mcpsReq ) == LORAMAC_STATUS_OK )
    {
        return false;
    }
    return true;
}

/*!
 * \brief Function executed on TxNextPacket Timeout event
 */
static void OnTxNextPacketTimerEvent( void )
{   
    MibRequestConfirm_t mibReq;
    LoRaMacStatus_t status;

    TimerStop( &TxNextPacketTimer );

    mibReq.Type = MIB_NETWORK_JOINED;
    status = LoRaMacMibGetRequestConfirm( &mibReq );

    if( status == LORAMAC_STATUS_OK )
    {
        if( mibReq.Param.IsNetworkJoined == true )
        {
            DeviceState = DEVICE_STATE_SEND;
            NextTx = true;
        }
        else
        {
            DeviceState = DEVICE_STATE_JOIN;
        }
    }
}

/*!
 * \brief   MCPS-Confirm event function
 *
 * \param   [IN] mcpsConfirm - Pointer to the confirm structure,
 *               containing confirm attributes.
 */
static void McpsConfirm( McpsConfirm_t *mcpsConfirm )
{
    if( mcpsConfirm->Status == LORAMAC_EVENT_INFO_STATUS_OK )
    {
        switch( mcpsConfirm->McpsRequest )
        {
            case MCPS_UNCONFIRMED:
            {
                // Check Datarate
                // Check TxPower
                break;
            }
            case MCPS_CONFIRMED:
            {
                // Check Datarate
                // Check TxPower
                // Check AckReceived
                // Check NbTrials
                LoRaMacUplinkStatus.Acked = mcpsConfirm->AckReceived;
                break;
            }
            case MCPS_PROPRIETARY:
            {
                break;
            }
            default:
                break;
        }
        LoRaMacUplinkStatus.Datarate = mcpsConfirm->Datarate;
        LoRaMacUplinkStatus.UplinkCounter = mcpsConfirm->UpLinkCounter;

        UplinkStatusUpdated = true;
    }
    NextTx = true;
}

/*!
 * \brief   MCPS-Indication event function
 *
 * \param   [IN] mcpsIndication - Pointer to the indication structure,
 *               containing indication attributes.
 */
static void McpsIndication( McpsIndication_t *mcpsIndication )
{
    if( mcpsIndication->Status != LORAMAC_EVENT_INFO_STATUS_OK )
    {
        return;
    }

    switch( mcpsIndication->McpsIndication )
    {
        case MCPS_UNCONFIRMED:
        {
            break;
        }
        case MCPS_CONFIRMED:
        {
            break;
        }
        case MCPS_PROPRIETARY:
        {
            break;
        }
        case MCPS_MULTICAST:
        {
            break;
        }
        default:
            break;
    }

    // Check Multicast
    // Check Port
    // Check Datarate
    // Check FramePending
    // Check Buffer
    // Check BufferSize
    // Check Rssi
    // Check Snr
    // Check RxSlot
    LoRaMacDownlinkStatus.Rssi = mcpsIndication->Rssi;
    if( mcpsIndication->Snr & 0x80 ) // The SNR sign bit is 1
    {
        // Invert and divide by 4
        LoRaMacDownlinkStatus.Snr = ( ( ~mcpsIndication->Snr + 1 ) & 0xFF ) >> 2;
        LoRaMacDownlinkStatus.Snr = -LoRaMacDownlinkStatus.Snr;
    }
    else
    {
        // Divide by 4
        LoRaMacDownlinkStatus.Snr = ( mcpsIndication->Snr & 0xFF ) >> 2;
    }
    LoRaMacDownlinkStatus.DownlinkCounter++;
    LoRaMacDownlinkStatus.RxData = mcpsIndication->RxData;
    LoRaMacDownlinkStatus.Port = mcpsIndication->Port;
    LoRaMacDownlinkStatus.Buffer = mcpsIndication->Buffer;
    LoRaMacDownlinkStatus.BufferSize = mcpsIndication->BufferSize;

    if( ComplianceTest.Running == true )
    {
        ComplianceTest.DownLinkCounter++;
    }
    
    // Update timestamp for last rx
    last_rx = current_time;

    if( mcpsIndication->RxData == true )
    {
        switch( mcpsIndication->Port )
        {
        case 15:
            break;
        case 224:
            if( ComplianceTest.Running == false )
            {
                // Check compliance test enable command (i)
                if( ( mcpsIndication->BufferSize == 4 ) &&
                    ( mcpsIndication->Buffer[0] == 0x01 ) &&
                    ( mcpsIndication->Buffer[1] == 0x01 ) &&
                    ( mcpsIndication->Buffer[2] == 0x01 ) &&
                    ( mcpsIndication->Buffer[3] == 0x01 ) )
                {
                    IsTxConfirmed = false;
                    AppPort = 224;
                    AppDataSize = 2;
                    ComplianceTest.DownLinkCounter = 0;
                    ComplianceTest.LinkCheck = false;
                    ComplianceTest.DemodMargin = 0;
                    ComplianceTest.NbGateways = 0;
                    ComplianceTest.Running = true;
                    ComplianceTest.State = 1;

                    MibRequestConfirm_t mibReq;
                    mibReq.Type = MIB_ADR;
                    mibReq.Param.AdrEnable = true;
                    LoRaMacMibSetRequestConfirm( &mibReq );

#if defined( USE_BAND_868 )
                    LoRaMacTestSetDutyCycleOn( false );
#endif
                }
            }
            else
            {
                ComplianceTest.State = mcpsIndication->Buffer[0];
                switch( ComplianceTest.State )
                {
                case 0: // Check compliance test disable command (ii)
                    IsTxConfirmed = LORAWAN_CONFIRMED_MSG_ON;
                    AppPort = LORAWAN_APP_PORT;
                    AppDataSize = LORAWAN_APP_DATA_SIZE;
                    ComplianceTest.DownLinkCounter = 0;
                    ComplianceTest.Running = false;

                    MibRequestConfirm_t mibReq;
                    mibReq.Type = MIB_ADR;
                    mibReq.Param.AdrEnable = LORAWAN_ADR_ON;
                    LoRaMacMibSetRequestConfirm( &mibReq );
#if defined( USE_BAND_868 )
                    LoRaMacTestSetDutyCycleOn( LORAWAN_DUTYCYCLE_ON );
#endif
                    break;
                case 1: // (iii, iv)
                    AppDataSize = 2;
                    break;
                case 2: // Enable confirmed messages (v)
                    IsTxConfirmed = true;
                    ComplianceTest.State = 1;
                    break;
                case 3:  // Disable confirmed messages (vi)
                    IsTxConfirmed = false;
                    ComplianceTest.State = 1;
                    break;
                case 4: // (vii)
                    AppDataSize = mcpsIndication->BufferSize;

                    AppData[0] = 4;
                    for( uint8_t i = 1; i < AppDataSize; i++ )
                    {
                        AppData[i] = mcpsIndication->Buffer[i] + 1;
                    }
                    break;
                case 5: // (viii)
                    {
                        MlmeReq_t mlmeReq;
                        mlmeReq.Type = MLME_LINK_CHECK;
                        LoRaMacMlmeRequest( &mlmeReq );
                    }
                    break;
                case 6: // (ix)
                    {
                        MlmeReq_t mlmeReq;

                        // Disable TestMode and revert back to normal operation
                        IsTxConfirmed = LORAWAN_CONFIRMED_MSG_ON;
                        AppPort = LORAWAN_APP_PORT;
                        AppDataSize = LORAWAN_APP_DATA_SIZE;
                        ComplianceTest.DownLinkCounter = 0;
                        ComplianceTest.Running = false;

                        MibRequestConfirm_t mibReq;
                        mibReq.Type = MIB_ADR;
                        mibReq.Param.AdrEnable = LORAWAN_ADR_ON;
                        LoRaMacMibSetRequestConfirm( &mibReq );
#if defined( USE_BAND_868 )
                        LoRaMacTestSetDutyCycleOn( LORAWAN_DUTYCYCLE_ON );
#endif

                        mlmeReq.Type = MLME_JOIN;

                        mlmeReq.Req.Join.DevEui = DevEui;
                        mlmeReq.Req.Join.AppEui = AppEui;
                        mlmeReq.Req.Join.AppKey = AppKey;
                        mlmeReq.Req.Join.NbTrials = 3;

                        LoRaMacMlmeRequest( &mlmeReq );
                        DeviceState = DEVICE_STATE_SLEEP;
                    }
                    break;
                case 7: // (x)
                    {
                        if( mcpsIndication->BufferSize == 3 )
                        {
                            MlmeReq_t mlmeReq;
                            mlmeReq.Type = MLME_TXCW;
                            mlmeReq.Req.TxCw.Timeout = ( uint16_t )( ( mcpsIndication->Buffer[1] << 8 ) | mcpsIndication->Buffer[2] );
                            LoRaMacMlmeRequest( &mlmeReq );
                        }
                        else if( mcpsIndication->BufferSize == 7 )
                        {
                            MlmeReq_t mlmeReq;
                            mlmeReq.Type = MLME_TXCW_1;
                            mlmeReq.Req.TxCw.Timeout = ( uint16_t )( ( mcpsIndication->Buffer[1] << 8 ) | mcpsIndication->Buffer[2] );
                            mlmeReq.Req.TxCw.Frequency = ( uint32_t )( ( mcpsIndication->Buffer[3] << 16 ) | ( mcpsIndication->Buffer[4] << 8 ) | mcpsIndication->Buffer[5] ) * 100;
                            mlmeReq.Req.TxCw.Power = mcpsIndication->Buffer[6];
                            LoRaMacMlmeRequest( &mlmeReq );
                        }
                        ComplianceTest.State = 1;
                    }
                    break;
                default:
                    break;
                }
            }
            break;
        default:
            break;
        }
    }
}

/*!
 * \brief   MLME-Confirm event function
 *
 * \param   [IN] mlmeConfirm - Pointer to the confirm structure,
 *               containing confirm attributes.
 */
static void MlmeConfirm( MlmeConfirm_t *mlmeConfirm )
{
    switch( mlmeConfirm->MlmeRequest )
    {
        case MLME_JOIN:
        {
            if( mlmeConfirm->Status == LORAMAC_EVENT_INFO_STATUS_OK )
            {
                // Status is OK, node has joined the network
                IsNetworkJoinedStatusUpdate = true;
                pc.printf("--- Joined ---\r\n");
                DeviceState = DEVICE_STATE_SEND;
                MessageType = MESSAGE_TYPE_READING;
                joining = false;
            }
            else
            {
                // Join was not successful. Try to join again
                DeviceState = DEVICE_STATE_JOIN;
            }
            break;
        }
        case MLME_LINK_CHECK:
        {
            if( mlmeConfirm->Status == LORAMAC_EVENT_INFO_STATUS_OK )
            {
                // Check DemodMargin
                // Check NbGateways
                if( ComplianceTest.Running == true )
                {
                    ComplianceTest.LinkCheck = true;
                    ComplianceTest.DemodMargin = mlmeConfirm->DemodMargin;
                    ComplianceTest.NbGateways = mlmeConfirm->NbGateways;
                }
            }
            break;
        }
        default:
            break;
    }
    NextTx = true;
    UplinkStatusUpdated = true;
}

void reset_pressure_sensor() {
    // Reset the sensor
    pc.printf("Resetting Sensor...\r\n");
    i2c.write(0x00, reset_command, 1);
}

void measure_pressure() {
    // Take a few manual measurements
    pc.printf("Measuring...\r\n");
    i2c.write((0x25 << 1), single_measure_command, 2);
}

float read_measurement() {
    char output[9];

    // Read measurements
    i2c.read((0x25 << 1), output, 9); // read from register

    // Interpret
    int16_t diffPressureTicks = (output[0] << 8) | output[1];
    // int16_t temperatureTicks = (output[3] << 8) | output[4];
    uint16_t scaleFactorDiffPressure = (output[6] << 8) | output[7];

    float diffPressure = (float)diffPressureTicks / (float)scaleFactorDiffPressure;

    return diffPressure;
}

/**
 * Main application entry point.
 */
int main( void )
{
    pc.printf("mbed-os-rev: %d.%d.%d   lib-rev: %d\r\n", \
            MBED_MAJOR_VERSION, MBED_MINOR_VERSION,MBED_PATCH_VERSION,MBED_VERSION);
    pc.printf("BUILD= %s, SysClock= %d\r\n", __TIME__, SystemCoreClock);

    pc.printf("CR= %X CSR= %X CFGR= %X PLL_HSE= %d\r\n", \
      RCC->CR, RCC->CSR, RCC->CFGR,  (RCC->CFGR>>16)&(1));
            
    wait(3);
    
    wd.Instance = IWDG;
    wd.Init.Prescaler = IWDG_PRESCALER_256; //About 32s
    wd.Init.Reload = 0x0FFF;
    wd.Init.Window = 0x0FFF;
    HAL_IWDG_Init(&wd);
    
    time_t start_time = time(NULL);
    current_time = start_time;
    last_rx = start_time;
    time_t last_measure = start_time;
    time_t measure_start = start_time;
    joining = true;
    
    pc.printf("Starting Both Sensors..\r\n");
    
    // set up SHT31
    si7021_power_pin = 1;
    si7021 = new Si7021(PB_14, PB_13);
    wait(1);
    
    si7021->measure();
    wait(1);
    pc.printf("Temp: %d\r\n", si7021->get_temperature());
    pc.printf("Humidity: %d\r\n", si7021->get_humidity());
    
    // set up pressure sensors
    reset_pressure_sensor();

    wait(0.1);

    measure_pressure();
    wait(0.1);
    average_pressure = read_measurement();
    pc.printf("Pressure: %f\r\n", average_pressure);

    bool measuring = false;

    wait(5);
    
    LoRaMacPrimitives_t LoRaMacPrimitives;
    LoRaMacCallback_t LoRaMacCallbacks;
    MibRequestConfirm_t mibReq;

    BoardInit( );

    DeviceState = DEVICE_STATE_INIT;

    while( 1 )
    {  
        //Call to reset watchdog
        HAL_IWDG_Refresh(&wd);
        
        current_time = time(NULL); // Update Time
        
        /*  ---- Reset if joining for more than 3 hours ----- */
        if ((current_time - start_time > 10800) && joining) {
            //Call to reset device
            NVIC_SystemReset();
        }

        /*  ---- Reset if no downlinks for more than 36 hours ----- */
        if ((current_time - last_rx > 129600) && !joining) {
            //Call to reset device
            NVIC_SystemReset();
        }
        
        switch( DeviceState )
        {
            case DEVICE_STATE_INIT:
            {
                LoRaMacPrimitives.MacMcpsConfirm = McpsConfirm;
                LoRaMacPrimitives.MacMcpsIndication = McpsIndication;
                LoRaMacPrimitives.MacMlmeConfirm = MlmeConfirm;
                LoRaMacCallbacks.GetBatteryLevel = BoardGetBatteryLevel;
                LoRaMacInitialization( &LoRaMacPrimitives, &LoRaMacCallbacks );

                TimerInit( &TxNextPacketTimer, OnTxNextPacketTimerEvent );

                mibReq.Type = MIB_ADR;
                mibReq.Param.AdrEnable = LORAWAN_ADR_ON;
                LoRaMacMibSetRequestConfirm( &mibReq );

                mibReq.Type = MIB_PUBLIC_NETWORK;
                mibReq.Param.EnablePublicNetwork = LORAWAN_PUBLIC_NETWORK;
                LoRaMacMibSetRequestConfirm( &mibReq );
                
                // Limiting to just 2nd subband of 8 channels
                static uint16_t GatewayChannelsMask[] = {0x00FF, 0x0000, 0x0000, 0x0000, 0x0001, 0x0000};
                mibReq.Type = MIB_CHANNELS_DEFAULT_MASK;
                mibReq.Param.ChannelsDefaultMask = GatewayChannelsMask;
                LoRaMacMibSetRequestConfirm( &mibReq );

                mibReq.Type = MIB_CHANNELS_MASK;
                mibReq.Param.ChannelsMask = GatewayChannelsMask;
                LoRaMacMibSetRequestConfirm( &mibReq );

#if defined( USE_BAND_868 )
                LoRaMacTestSetDutyCycleOn( LORAWAN_DUTYCYCLE_ON );

#if( USE_SEMTECH_DEFAULT_CHANNEL_LINEUP == 1 )
                LoRaMacChannelAdd( 3, ( ChannelParams_t )LC4 );
                LoRaMacChannelAdd( 4, ( ChannelParams_t )LC5 );
                LoRaMacChannelAdd( 5, ( ChannelParams_t )LC6 );
                LoRaMacChannelAdd( 6, ( ChannelParams_t )LC7 );
                LoRaMacChannelAdd( 7, ( ChannelParams_t )LC8 );
                LoRaMacChannelAdd( 8, ( ChannelParams_t )LC9 );
                LoRaMacChannelAdd( 9, ( ChannelParams_t )LC10 );

                mibReq.Type = MIB_RX2_DEFAULT_CHANNEL;
                mibReq.Param.Rx2DefaultChannel = ( Rx2ChannelParams_t ){ 869525000, DR_3 };
                LoRaMacMibSetRequestConfirm( &mibReq );

                mibReq.Type = MIB_RX2_CHANNEL;
                mibReq.Param.Rx2Channel = ( Rx2ChannelParams_t ){ 869525000, DR_3 };
                LoRaMacMibSetRequestConfirm( &mibReq );
#endif

#endif

                LoRaMacDownlinkStatus.DownlinkCounter = 0;

                DeviceState = DEVICE_STATE_JOIN;
                break;
            }
            case DEVICE_STATE_JOIN:
            {
                pc.printf("--- Joining ---\r\n");
                
#if( OVER_THE_AIR_ACTIVATION != 0 )
                MlmeReq_t mlmeReq;

                mlmeReq.Type = MLME_JOIN;

                mlmeReq.Req.Join.DevEui = DevEui;
                mlmeReq.Req.Join.AppEui = AppEui;
                mlmeReq.Req.Join.AppKey = AppKey;

                if( NextTx == true )
                {
                    LoRaMacMlmeRequest( &mlmeReq );
                }
                DeviceState = DEVICE_STATE_SLEEP;
#else
                mibReq.Type = MIB_NET_ID;
                mibReq.Param.NetID = LORAWAN_NETWORK_ID;
                LoRaMacMibSetRequestConfirm( &mibReq );

                mibReq.Type = MIB_DEV_ADDR;
                mibReq.Param.DevAddr = DevAddr;
                LoRaMacMibSetRequestConfirm( &mibReq );

                mibReq.Type = MIB_NWK_SKEY;
                mibReq.Param.NwkSKey = NwkSKey;
                LoRaMacMibSetRequestConfirm( &mibReq );

                mibReq.Type = MIB_APP_SKEY;
                mibReq.Param.AppSKey = AppSKey;
                LoRaMacMibSetRequestConfirm( &mibReq );

                mibReq.Type = MIB_NETWORK_JOINED;
                mibReq.Param.IsNetworkJoined = true;
                LoRaMacMibSetRequestConfirm( &mibReq );

                DeviceState = DEVICE_STATE_SEND;
#endif
                IsNetworkJoinedStatusUpdate = true;
                break;
            }
            case DEVICE_STATE_SEND:
            {
                if( NextTx == true )
                {
                    PrepareTxFrame( AppPort );

                    NextTx = SendFrame( );
                }
                DeviceState = DEVICE_STATE_CYCLE;
                break;
            }
            case DEVICE_STATE_CYCLE:
            {
                if (measuring) {
                  /* check if done measuring & swap to send state */
                  if (current_time - measure_start > 0) {
                    average_pressure = read_measurement();
                    pc.printf("Pressure: %f\r\n", average_pressure);
                    pc.printf("Temperature: %d\r\n", si7021->get_temperature());
                    pc.printf("Humidity: %d\r\n", si7021->get_humidity());
                    measuring = false;
                    DeviceState = DEVICE_STATE_SEND;
                    MessageType = MESSAGE_TYPE_READING;
                  }
                } else {
                  // check if it's time to start measuring
                  if (current_time - last_measure > MEASUREMENT_GAP_SECONDS) {
                    // take a measurement
                    measure_start = current_time;
                    last_measure = current_time;
                    measuring = true;
                    measure_pressure();
                    si7021->measure();
                  }
                }

                break;
            }
            case DEVICE_STATE_SLEEP:
            {
                // Wake up through events
                break;
            }
            default:
            {
                DeviceState = DEVICE_STATE_INIT;
                break;
            }
        }
    }
}