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/**************************************************************************

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*

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* Copyright (C) 2006 Steve Karg <skarg@users.sourceforge.net>

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* Copyright (C) 2017 Mario de Sousa <msousa@fe.up.pt>

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*

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* Permission is hereby granted, free of charge, to any person obtaining

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* a copy of this software and associated documentation files (the

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* "Software"), to deal in the Software without restriction, including

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* without limitation the rights to use, copy, modify, merge, publish,

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* distribute, sublicense, and/or sell copies of the Software, and to

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* permit persons to whom the Software is furnished to do so, subject to

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* the following conditions:

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*

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* The above copyright notice and this permission notice shall be included

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* in all copies or substantial portions of the Software.

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*

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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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*

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*********************************************************************/

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#include <stddef.h>

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#include <stdint.h>

    28

#include <stdio.h>

    29

#include <stdlib.h>

    30

#include <signal.h>

    31

#include <time.h>

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#include <inttypes.h>  // uint32_t, ..., PRIu32, ...

    33

    34

#include "config_bacnet_for_beremiz_%(locstr)s.h"     /* the custom configuration for beremiz pluginh  */

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#include "server_%(locstr)s.h"

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#include "address.h"

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#include "bacdef.h"

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#include "handlers.h"

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#include "client.h"

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#include "dlenv.h"

    41

#include "bacdcode.h"

    42

#include "npdu.h"

    43

#include "apdu.h"

    44

#include "iam.h"

    45

#include "tsm.h"

    46

#include "datalink.h"

    47

#include "dcc.h"

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#include "getevent.h"

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#include "net.h"

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#include "txbuf.h"

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#include "version.h"

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#include "timesync.h"

    53

    54

    55

/* A utility function used by most (all?) implementations of BACnet Objects */

    56

/* Adds to Prop_List all entries in Prop_List_XX that are not

    57

 * PROP_OBJECT_IDENTIFIER, PROP_OBJECT_NAME, PROP_OBJECT_TYPE, PROP_PROPERTY_LIST

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 * and returns the number of elements that were added

    59

 */

    60

int BACnet_Init_Properties_List(

    61

          int *Prop_List, 

    62

    const int *Prop_List_XX) {

    63

    64

    unsigned int i = 0;

    65

    unsigned int j = 0;

    66

    67

    for (j = 0; Prop_List_XX[j] >= 0; j++)

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        // Add any propety, except for the following 4 which should not be included

    69

        // in the Property_List property array.

    70

        //  (see ASHRAE 135-2016, for example section 12.4.34)

    71

        if ((Prop_List_XX[j] != PROP_OBJECT_IDENTIFIER) &&

    72

            (Prop_List_XX[j] != PROP_OBJECT_NAME)       &&

    73

            (Prop_List_XX[j] != PROP_OBJECT_TYPE)       &&

    74

            (Prop_List_XX[j] != PROP_PROPERTY_LIST)) {

    75

            Prop_List[i] = Prop_List_XX[j];

    76

            i++;

    77

        }

    78

    Prop_List[i] = -1; // marks the end of the list!

    79

    return i;

    80

}

    81

    82

    83

    84

    85

    86

    87

int BACnet_encode_character_string(uint8_t *apdu, const char *str) {

    88

    BACNET_CHARACTER_STRING   char_string;

    89

    characterstring_init_ansi(&char_string, str);

    90

    /* FIXME: this might go beyond MAX_APDU length! */

    91

    return encode_application_character_string(apdu, &char_string);

    92

}

    93

    94

/* macro that always returns false.

    95

 * To be used as the 'test_null' parameter to the BACnet_encode_array macro

    96

 * in situations where we should never encode_null() values.

    97

 */

    98

#define retfalse(x) (false)

    99

   100

#define BACnet_encode_array(array, array_len, test_null, encode_function)                  \

   101

{                                                                                           \

   102

    uint8_t *apdu = NULL;                                                                   \

   103

    apdu = rpdata->application_data;                                                        \

   104

                                                                                            \

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    switch (rpdata->array_index) {                                                          \

   106

      case 0: /* Array element zero is the number of elements in the array */               \

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        apdu_len = encode_application_unsigned(&apdu[0], array_len);                        \

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        break;                                                                              \

   109

      case BACNET_ARRAY_ALL: {                                                              \

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        /* if no index was specified, then try to encode the entire list */                 \

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        unsigned i = 0;                                                                     \

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        apdu_len   = 0;                                                                     \

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        for (i = 0; i < array_len; i++) {                                                   \

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            /* FIXME: this might go beyond MAX_APDU length! */                              \

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            if (!test_null(array[i]))                                                       \

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                  apdu_len += encode_function        (&apdu[apdu_len], array[i]);           \

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            else  apdu_len += encode_application_null(&apdu[apdu_len]);                     \

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            /* return error if it does not fit in the APDU */                               \

   119

            if (apdu_len >= MAX_APDU) {                                                     \

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                rpdata->error_class = ERROR_CLASS_SERVICES;                                 \

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                rpdata->error_code = ERROR_CODE_NO_SPACE_FOR_OBJECT;                        \

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                apdu_len = BACNET_STATUS_ERROR;                                             \

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                break; /* for(;;) */                                                        \

   124

            }                                                                               \

   125

        }                                                                                   \

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        break;                                                                              \

   127

      }                                                                                     \

   128

      default:                                                                              \

   129

        if (rpdata->array_index <= array_len) {                                             \

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            if (!test_null(array[rpdata->array_index - 1]))                                 \

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                  apdu_len += encode_function(&apdu[0], array[rpdata->array_index - 1]);    \

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            else  apdu_len += encode_application_null(&apdu[0]);                            \

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        } else {                                                                            \

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            rpdata->error_class = ERROR_CLASS_PROPERTY;                                     \

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            rpdata->error_code = ERROR_CODE_INVALID_ARRAY_INDEX;                            \

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            apdu_len = BACNET_STATUS_ERROR;                                                 \

   137

        }                                                                                   \

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        break;                                                                              \

   139

    } /* switch() */                                                                        \

   140

}

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   142

   143

/* include the device object */

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#include "device_%(locstr)s.c"

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#include "ai_%(locstr)s.c"

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#include "ao_%(locstr)s.c"

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#include "av_%(locstr)s.c"

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#include "bi_%(locstr)s.c"

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#include "bo_%(locstr)s.c"

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#include "bv_%(locstr)s.c"

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#include "msi_%(locstr)s.c"

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#include "mso_%(locstr)s.c"

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#include "msv_%(locstr)s.c"

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   155

   156

/** Buffer used for receiving */

   157

static uint8_t Rx_Buf[MAX_MPDU] = { 0 };

   158

   159

   160

   161

   162

/*******************************************************/

   163

/* BACnet Service Handlers taylored to Beremiz plugin  */ 

   164

/*******************************************************/

   165

   166

static void BACNET_show_date_time(

   167

    BACNET_DATE * bdate,

   168

    BACNET_TIME * btime)

   169

{

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    /* show the date received */

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    fprintf(stderr, "%%u", (unsigned) bdate->year);

   172

    fprintf(stderr, "/%%u", (unsigned) bdate->month);

   173

    fprintf(stderr, "/%%u", (unsigned) bdate->day);

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    /* show the time received */

   175

    fprintf(stderr, " %%02u", (unsigned) btime->hour);

   176

    fprintf(stderr, ":%%02u", (unsigned) btime->min);

   177

    fprintf(stderr, ":%%02u", (unsigned) btime->sec);

   178

    fprintf(stderr, ".%%02u", (unsigned) btime->hundredths);

   179

    fprintf(stderr, "\r\n");

   180

}

   181

   182

static time_t __timegm(struct tm *new_time) {

   183

    time_t     sec =  mktime(new_time);  /* assume new_time is in local time */

   184

   185

    /* sec will be an aproximation of the correct value. 

   186

     * We must now fix this with the current difference

   187

     * between UTC and localtime.

   188

     * 

   189

     * WARNING: The following algorithm to determine the current

   190

     *          difference between local time and UTC will not 

   191

     *          work if each value (lcl and utc) falls on a different

   192

     *          side of a change to/from DST.

   193

     *          For example, assume a change to DST is made at 12h00 

   194

     *          of day X. The following algorithm does not work if:

   195

     *            - lcl falls before 12h00 of day X

   196

     *            - utc falls after  12h00 of day X

   197

     */

   198

    struct  tm lcl = *localtime(&sec); // lcl will be == new_time

   199

    struct  tm utc = *gmtime   (&sec);

   200

   201

    if (lcl.tm_isdst == 1)  utc.tm_isdst = 1;

   202

   203

    time_t sec_lcl =  mktime(&lcl);

   204

    time_t sec_utc =  mktime(&utc);

   205

   206

    /* difference in seconds between localtime and utc */

   207

    time_t sec_dif = sec_lcl - sec_utc;

   208

    return sec + sec_dif;

   209

}

   210

   211

   212

static void BACNET_set_date_time(

   213

    BACNET_DATE * bdate,

   214

    BACNET_TIME * btime,

   215

    int utc /* set to > 0 if date & time in UTC */)

   216

{

   217

    struct tm       brokendown_time;

   218

    time_t          seconds = 0;

   219

    struct timespec ts;

   220

   221

    brokendown_time.tm_sec   = btime->sec;        /* seconds 0..60    */

   222

    brokendown_time.tm_min   = btime->min;        /* minutes 0..59    */

   223

    brokendown_time.tm_hour  = btime->hour;       /* hours   0..23    */

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    brokendown_time.tm_mday  = bdate->day;        /* day of the month 1..31 */

   225

    brokendown_time.tm_mon   = bdate->month-1;    /* month 0..11      */

   226

    brokendown_time.tm_year  = bdate->year-1900;  /* years since 1900 */

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//  brokendown_time.tm_wday  = ;                  /* day of the week  */

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//  brokendown_time.tm_yday  = ;                  /* day in the year  */

   229

    brokendown_time.tm_isdst = -1;                /* daylight saving time (-1 => unknown) */

   230

   231

    // Tranform time into format -> 'seconds since epoch'

   232

    /* WARNING: timegm() is a non standard GNU extension.

   233

     *          If you do not have it on your build system then consider

   234

     *          finding the source code for timegm() (it is LGPL) from GNU

   235

     *          C library and copying it here 

   236

     *          (e.g. https://code.woboq.org/userspace/glibc/time/timegm.c.html)

   237

     *          Another alternative is to use the fundion __timegm() above,

   238

     *          which will mostly work but may have errors when the time being 

   239

     *          converted is close to the time in the year when changing 

   240

     *          to/from DST (daylight saving time)

   241

     */

   242

    if (utc > 0) seconds = timegm(&brokendown_time);    

   243

    else         seconds = mktime(&brokendown_time);

   244

   245

    ts.tv_sec  = seconds;

   246

    ts.tv_nsec = btime->hundredths*10*1000*1000;

   247

   248

//  fprintf(stderr, "clock_settime() s=%%ul,  ns=%%u\n", ts.tv_sec, ts.tv_nsec);

   249

    clock_settime(CLOCK_REALTIME, &ts); 

   250

//  clock_gettime(CLOCK_REALTIME, &ts); 

   251

//  fprintf(stderr, "clock_gettime() s=%%ul,  ns=%%u\n", ts.tv_sec, ts.tv_nsec);

   252

}

   253

   254

   255

   256

void BACnet_handler_timesync(

   257

    uint8_t * service_request,

   258

    uint16_t service_len,

   259

    BACNET_ADDRESS * src)

   260

{

   261

    int len = 0;

   262

    BACNET_DATE bdate;

   263

    BACNET_TIME btime;

   264

   265

    (void) src;

   266

    (void) service_len;

   267

    len =

   268

        timesync_decode_service_request(service_request, service_len, &bdate, &btime);

   269

    if (len > 0) {

   270

        fprintf(stderr, "BACnet plugin: Received TimeSyncronization Request -> ");

   271

        BACNET_show_date_time(&bdate, &btime);

   272

        /* set the time */

   273

        BACNET_set_date_time(&bdate, &btime, 0 /* time in local time */);

   274

    }

   275

   276

    return;

   277

}

   278

   279

void BACnet_handler_timesync_utc(

   280

    uint8_t * service_request,

   281

    uint16_t service_len,

   282

    BACNET_ADDRESS * src)

   283

{

   284

    int len = 0;

   285

    BACNET_DATE bdate;

   286

    BACNET_TIME btime;

   287

   288

    (void) src;

   289

    (void) service_len;

   290

    len =

   291

        timesync_decode_service_request(service_request, service_len, &bdate, &btime);

   292

    if (len > 0) {

   293

        fprintf(stderr, "BACnet plugin: Received TimeSyncronizationUTC Request -> ");

   294

        BACNET_show_date_time(&bdate, &btime);

   295

        /* set the time */

   296

        BACNET_set_date_time(&bdate, &btime, 1 /* time in UTC */);

   297

    }

   298

   299

    return;

   300

}

   301

   302

   303

   304

/**********************************************/

   305

/** Initialize the handlers we will utilize. **/

   306

/**********************************************/

   307

/*

   308

 * TLDR: The functions that will create the __Resp.__ messages.

   309

 * 

   310

 * The service handlers are the functions that will respond to BACnet requests this device receives.

   311

 * In essence, the service handlers will create and send the Resp. (Response) messages

   312

 * of the Req. -> Ind. -> Resp. -> Conf. service sequence defined in OSI

   313

 * (Request, Indication, Response, Confirmation)

   314

 * 

   315

 */

   316

static int Init_Service_Handlers(

   317

    void)

   318

{

   319

    /* set the handler for all the services we don't implement */

   320

    /* It is required to send the proper reject message... */

   321

    apdu_set_unrecognized_service_handler_handler(handler_unrecognized_service);

   322

   323

    /* Set the handlers for any unconfirmed services that we support. */

   324

    apdu_set_unconfirmed_handler(SERVICE_UNCONFIRMED_WHO_IS,  // DM-DDB-B - Dynamic Device Binding B (Resp.)

   325

                                   handler_who_is);           //            (see ASHRAE 135-2016, section K5.1 and K5.2)

   326

//  apdu_set_unconfirmed_handler(SERVICE_UNCONFIRMED_I_AM,    // DM-DDB-A - Dynamic Device Binding A (Resp.)

   327

//                                 handler_i_am_bind);        //            Responding to I_AM requests is for clients (A)!

   328

//                                                            //            (see ASHRAE 135-2016, section K5.1 and K5.2)

   329

    apdu_set_unconfirmed_handler(SERVICE_UNCONFIRMED_WHO_HAS, // DM-DOB-B - Dynamic Object Binding B (Resp.)

   330

                                   handler_who_has);          //            (see ASHRAE 135-2016, section K5.3 and K5.4)

   331

//  apdu_set_unconfirmed_handler(SERVICE_UNCONFIRMED_I_HAVE,  // DM-DOB-A - Dynamic Object Binding A (Resp.)

   332

//                                 handler_i_have);           //            Responding to I_HAVE requests is for clients (A)!

   333

//                                                            //            (see ASHRAE 135-2016, section K5.3 and K5.4)

   334

    apdu_set_unconfirmed_handler(SERVICE_UNCONFIRMED_UTC_TIME_SYNCHRONIZATION, // DM-UTC-B -UTCTimeSynchronization-B (Resp.)

   335

                                 BACnet_handler_timesync_utc);                 //            (see ASHRAE 135-2016, section K5.14)

   336

    apdu_set_unconfirmed_handler(SERVICE_UNCONFIRMED_TIME_SYNCHRONIZATION,     // DM-TS-B - TimeSynchronization-B (Resp.)

   337

                                 BACnet_handler_timesync);                     //            (see ASHRAE 135-2016, section K5.12)

   338

   339

    /* Set the handlers for any confirmed services that we support. */

   340

    apdu_set_confirmed_handler(SERVICE_CONFIRMED_READ_PROPERTY,      // DS-RP-B - Read Property B (Resp.)

   341

                                 handler_read_property);             //            (see ASHRAE 135-2016, section K1.2)

   342

//  apdu_set_confirmed_handler(SERVICE_CONFIRMED_READ_PROP_MULTIPLE, // DS-RPM-B -Read Property Multiple-B (Resp.)

   343

//                               handler_read_property_multiple);    //            (see ASHRAE 135-2016, section K1.4)

   344

    apdu_set_confirmed_handler(SERVICE_CONFIRMED_WRITE_PROPERTY,     // DS-WP-B - Write Property B (Resp.)

   345

                                 handler_write_property);            //            (see ASHRAE 135-2016, section K1.8)

   346

//  apdu_set_confirmed_handler(SERVICE_CONFIRMED_WRITE_PROP_MULTIPLE,// DS-WPM-B -Write Property Multiple B (Resp.)

   347

//                               handler_write_property_multiple);   //            (see ASHRAE 135-2016, section K1.10)

   348

//  apdu_set_confirmed_handler(SERVICE_CONFIRMED_READ_RANGE,

   349

//                               handler_read_range);

   350

//  apdu_set_confirmed_handler(SERVICE_CONFIRMED_REINITIALIZE_DEVICE,

   351

//                               handler_reinitialize_device);

   352

   353

//  apdu_set_confirmed_handler(SERVICE_CONFIRMED_SUBSCRIBE_COV,

   354

//                               handler_cov_subscribe);

   355

//  apdu_set_unconfirmed_handler(SERVICE_UNCONFIRMED_COV_NOTIFICATION,

   356

//                               handler_ucov_notification);

   357

    /* handle communication so we can shutup when asked */

   358

    apdu_set_confirmed_handler(SERVICE_CONFIRMED_DEVICE_COMMUNICATION_CONTROL, // DM-DCC-B - Device Communication Control B

   359

                                 handler_device_communication_control);        //            (see ASHRAE 135-2016, section K5.6)

   360

//  /* handle the data coming back from private requests */

   361

//  apdu_set_unconfirmed_handler(SERVICE_UNCONFIRMED_PRIVATE_TRANSFER,

   362

//                               handler_unconfirmed_private_transfer);

   363

   364

    // success

   365

    return 0;

   366

}

   367

   368

   369

   370

static int Init_Network_Interface(

   371

    const char *interface,    // for linux:   /dev/eth0, /dev/eth1, /dev/wlan0, ...

   372

                              // for windows: 192.168.0.1 (IP addr. of interface)

   373

                              // NULL => use default!

   374

    const char *port,         // Port the server will listen on. (NULL => use default)

   375

    const char *apdu_timeout, // (NULL => use default)

   376

    const char *apdu_retries  // (NULL => use default)

   377

   )

   378

{

   379

    char datalink_layer[4];

   380

   381

    strcpy(datalink_layer, "BIP"); // datalink_set() does not accpet const char *, so we copy it...

   382

//  BIP_Debug = true;

   383

   384

    if (port != NULL) {

   385

        bip_set_port(htons((uint16_t) strtol(port, NULL, 0)));

   386

    } else {

   387

            bip_set_port(htons(0xBAC0));

   388

    }

   389

   390

    if (apdu_timeout != NULL) {

   391

        apdu_timeout_set((uint16_t) strtol(apdu_timeout, NULL, 0));

   392

    }

   393

   394

    if (apdu_retries != NULL) {

   395

        apdu_retries_set((uint8_t) strtol(apdu_retries, NULL, 0));

   396

    }

   397

   398

    // datalink_init is a pointer that will actually call bip_init()

   399

    // datalink_init pointer is set by the call datalink_set("BIP")

   400

    /* NOTE: current implementation of BACnet stack uses the interface

   401

     *       only to determine the server's local IP address and broacast address.

   402

     *       The local IP addr is later used to discard (broadcast) messages

   403

     *       it receives that were sent by itself.

   404

     *       The broadcast IP addr is used for broadcast messages.

   405

     *       WARNING: The socket itself is created to listen on all 

   406

     *       available interfaces (INADDR_ANY), so this setting may induce

   407

     *       the user in error as we will accept messages arriving on other

   408

     *       interfaces (if they exist)

   409

     *       (see bip_init() in ports/linux/bip-init.c)

   410

     *       (see bip_****() in src/bip.c)

   411

     */

   412

    char *tmp = (char *)malloc(strlen(interface) + 1);

   413

    if (tmp == NULL) return -1;

   414

    strncpy(tmp, interface, strlen(interface) + 1);

   415

    if (!datalink_init(tmp)) {

   416

        return -1;

   417

    }

   418

// #if (MAX_TSM_TRANSACTIONS)

   419

//     pEnv = getenv("BACNET_INVOKE_ID");

   420

//     if (pEnv) {

   421

//         tsm_invokeID_set((uint8_t) strtol(pEnv, NULL, 0));

   422

//     }

   423

// #endif

   424

    dlenv_register_as_foreign_device();

   425

   426

    // success

   427

    return 0;

   428

}

   429

   430

   431

// This mutex blocks execution of __init_%(locstr)s() until initialization is done

   432

static int init_done = 0;

   433

static pthread_mutex_t init_done_lock = PTHREAD_MUTEX_INITIALIZER;

   434

static pthread_cond_t init_done_cond = PTHREAD_COND_INITIALIZER;

   435

   436

/** Main function of server demo. **/

   437

int bn_server_run(server_node_t *server_node) {

   438

    int res = 0;

   439

    BACNET_ADDRESS src = {0};  /* address where message came from */

   440

    uint16_t pdu_len = 0;

   441

    unsigned timeout = 1000;       /* milliseconds */

   442

    time_t last_seconds = 0;

   443

    time_t current_seconds = 0;

   444

    uint32_t elapsed_seconds = 0;

   445

    uint32_t elapsed_milliseconds = 0;

   446

    uint32_t address_binding_tmr = 0;

   447

    uint32_t recipient_scan_tmr = 0;

   448

   449

    /* allow the device ID to be set */

   450

    Device_Set_Object_Instance_Number(server_node->device_id);

   451

    /* load any static address bindings in our device bindings list */

   452

    address_init();

   453

    /* load any entries in the BDT table from backup file */

   454

    bvlc_bdt_restore_local();

   455

    /* Initiliaze the bacnet server 'device' */    

   456

    Device_Init(server_node->device_name);

   457

   458

    pthread_mutex_lock(&init_done_lock);

   459

    init_done = 1;

   460

    pthread_cond_signal(&init_done_cond);

   461

    pthread_mutex_unlock(&init_done_lock);

   462

   463

    /* Set the password (max 31 chars) for Device Communication Control request. */

   464

    /* Default in the BACnet stack is hardcoded as "filister" */

   465

    /* (char *) cast is to remove the cast. The function is incorrectly declared/defined in the BACnet stack! */

   466

    /* BACnet stack needs to change demo/handler/h_dcc.c and include/handlers.h                               */

   467

    handler_dcc_password_set((char *)server_node->comm_control_passwd);

   468

    /* Set callbacks and configure network interface */

   469

    res = Init_Service_Handlers();

   470

    if (res < 0) exit(1);

   471

    res = Init_Network_Interface(

   472

            server_node->network_interface, // interface    (NULL => use default (eth0))

   473

            server_node->port_number,       // Port number  (NULL => use default (0xBAC0))

   474

            NULL,              // apdu_timeout (NULL => use default)

   475

            NULL               // apdu_retries (NULL => use default)

   476

           );

   477

    if (res < 0) {

   478

        fprintf(stderr, "BACnet plugin: error initializing bacnet server node %%s!\n", server_node->location);

   479

        exit(1); // kill the server thread!

   480

    }

   481

    /* BACnet stack correcly configured. Give user some feedback! */

   482

    struct in_addr my_addr, broadcast_addr;

   483

    my_addr.       s_addr = bip_get_addr();

   484

    broadcast_addr.s_addr = bip_get_broadcast_addr();

   485

    printf("BACnet plugin:"

   486

                         " Local IP addr: %%s" 

   487

                        ", Broadcast IP addr: %%s" 

   488

                        ", Port number: 0x%%04X [%%hu]" 

   489

                        ", BACnet Device ID: %%d"

   490

                        ", Max APDU: %%d"

   491

                        ", BACnet Stack Version %%s\n",

   492

                        inet_ntoa(my_addr),

   493

                        inet_ntoa(broadcast_addr),

   494

                        ntohs(bip_get_port()), ntohs(bip_get_port()),

   495

                        Device_Object_Instance_Number(), 

   496

                        MAX_APDU,

   497

                        Device_Firmware_Revision()

   498

                        );

   499

    /* configure the timeout values */

   500

    last_seconds = time(NULL);

   501

    /* broadcast an I-Am on startup */

   502

    Send_I_Am(&Handler_Transmit_Buffer[0]);

   503

    /* loop forever */

   504

    for (;;) {

   505

        /* input */

   506

        current_seconds = time(NULL);

   507

   508

        /* returns 0 bytes on timeout */

   509

        pdu_len = datalink_receive(&src, &Rx_Buf[0], MAX_MPDU, timeout);

   510

   511

        /* process */

   512

        if (pdu_len) {

   513

            npdu_handler(&src, &Rx_Buf[0], pdu_len);

   514

        }

   515

        /* at least one second has passed */

   516

        elapsed_seconds = (uint32_t) (current_seconds - last_seconds);

   517

        if (elapsed_seconds) {

   518

            last_seconds = current_seconds;

   519

            dcc_timer_seconds(elapsed_seconds);

   520

            bvlc_maintenance_timer(elapsed_seconds);

   521

            dlenv_maintenance_timer(elapsed_seconds);

   522

            elapsed_milliseconds = elapsed_seconds * 1000;

   523

            tsm_timer_milliseconds(elapsed_milliseconds);

   524

        }

   525

        handler_cov_task();

   526

        /* scan cache address */

   527

        address_binding_tmr += elapsed_seconds;

   528

        if (address_binding_tmr >= 60) {

   529