arexxd.c

   1 /*
   2  *      Linux Interfece for Arexx Data Loggers
   3  *
   4  *      (c) 2011-2020 Martin Mares <mj@ucw.cz>
   5  */
   6
   7 #include <stdio.h>
   8 #include <stdarg.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12 #include <fcntl.h>
  13 #include <math.h>
  14 #include <time.h>
  15 #include <getopt.h>
  16 #include <syslog.h>
  17 #include <signal.h>
  18 #include <sys/stat.h>
  19 #include <libusb-1.0/libusb.h>
  20
  21 #define DEFAULT_LOG_DIR "/var/log/arexxd"
  22
  23 /*
  24  *  Data points received from the logger are sometimes corrupted by noise.
  25  *  This effects not only the measured values, but also sensor IDs and timestamps.
  26  *  Since rrdtool cannot skip back in time, a random timestamp in the future can
  27  *  cause all further measurements to be dropped. To minimize impact of these
  28  *  problems, we drop data points which are too far in the past or in the future.
  29  *
  30  *  Furthermore, you can ignore data from unrecognized sensors, i.e., those
  31  *  which are not handled by correct_point().
  32  */
  33 #define MAX_PAST_TIME 30*86400
  34 #define MAX_FUTURE_TIME 300
  35 #define IGNORE_UNKNOWN_SENSORS
  36
  37 #undef LOG_TO_RRD
  38 #define LOG_TO_MQTT
  39
  40 typedef unsigned char byte;
  41 typedef unsigned int uint;
  42 static libusb_context *usb_ctxt;
  43 static libusb_device_handle *devh;
  44
  45 static int use_syslog;
  46 static int debug_mode;
  47 static int debug_packets;
  48 static int debug_raw_data;
  49 static char *log_dir = DEFAULT_LOG_DIR;
  50 static int no_fork;
  51
  52 #define UNUSED __attribute__((unused))
  53
  54 static int data_point_counter;          // Since last log message
  55 static time_t packet_rx_time;
  56
  57 static void die(char *fmt, ...)
  58 {
  59         va_list args;
  60         va_start(args, fmt);
  61         if (use_syslog)
  62                 vsyslog(LOG_CRIT, fmt, args);
  63         else {
  64                 vfprintf(stderr, fmt, args);
  65                 fprintf(stderr, "\n");
  66         }
  67         va_end(args);
  68         exit(1);
  69 }
  70
  71 static void log_error(char *fmt, ...)
  72 {
  73         va_list args;
  74         va_start(args, fmt);
  75         if (use_syslog)
  76                 vsyslog(LOG_ERR, fmt, args);
  77         else {
  78                 vfprintf(stderr, fmt, args);
  79                 fprintf(stderr, "\n");
  80         }
  81         va_end(args);
  82 }
  83
  84 static void log_info(char *fmt, ...)
  85 {
  86         va_list args;
  87         va_start(args, fmt);
  88         if (use_syslog)
  89                 vsyslog(LOG_INFO, fmt, args);
  90         else {
  91                 vfprintf(stderr, fmt, args);
  92                 fprintf(stderr, "\n");
  93         }
  94         va_end(args);
  95 }
  96
  97 static void log_pkt(char *fmt, ...)
  98 {
  99         if (!debug_packets)
 100                 return;
 101         va_list args;
 102         va_start(args, fmt);
 103         vprintf(fmt, args);
 104         va_end(args);
 105 }
 106
 107 /*** MQTT interface ***/
 108
 109 #ifdef LOG_TO_MQTT
 110
 111 #include <mosquitto.h>
 112
 113 static struct mosquitto *mosq;
 114
 115 static void mqtt_publish(const char *topic, const char *fmt, ...)
 116 {
 117         va_list args;
 118         va_start(args, fmt);
 119         char m[256];
 120         int l = vsnprintf(m, sizeof(m), fmt, args);
 121         if (mosquitto_publish(mosq, NULL, topic, l, m, 0, true) != MOSQ_ERR_SUCCESS)
 122                 log_error("Mosquitto: publish failed");
 123         va_end(args);
 124 }
 125
 126 static void mqtt_conn_callback(struct mosquitto *mosq UNUSED, void *obj UNUSED, int status)
 127 {
 128         if (!status)
 129                 mqtt_publish("status/arexxd", "ok");
 130 }
 131
 132 static void mqtt_init(void)
 133 {
 134         mosquitto_lib_init();
 135         mosq = mosquitto_new("arexxd", 1, NULL);
 136         if (!mosq)
 137                 die("Mosquitto: initialization failed");
 138
 139         if (mosquitto_tls_set(mosq, "/etc/burrow-mqtt/ca.crt", NULL, "/etc/burrow-mqtt/client.crt", "/etc/burrow-mqtt/client.key", NULL) != MOSQ_ERR_SUCCESS)
 140                 die("Mosquitto: unable to set TLS parameters");
 141
 142         if (mosquitto_will_set(mosq, "status/arexxd", 4, "dead", 0, true) != MOSQ_ERR_SUCCESS)
 143                 die("Mosquitto: unable to set will");
 144
 145         mosquitto_connect_callback_set(mosq, mqtt_conn_callback);
 146
 147         if (mosquitto_connect(mosq, "burrow-mqtt", 8883, 60) != MOSQ_ERR_SUCCESS)
 148                 die("Mosquitto: connect failed");
 149
 150         if (mosquitto_loop_start(mosq))
 151                 die("Mosquitto: cannot start service thread");
 152 }
 153
 154 static void mqtt_point(time_t t, const char *name, double val, char *unit UNUSED)
 155 {
 156         // We do not feed past data to MQTT (so MAX_PAST_TIME is stronger for us)
 157         if (t < packet_rx_time - 30)
 158                 return;
 159
 160         char topic[64];
 161         snprintf(topic, sizeof(topic), "burrow/temp/%s", name);
 162         mqtt_publish(topic, "%.3f %lld", val, (long long) t);
 163 }
 164
 165 #endif
 166
 167 /*** RRD interface ***/
 168
 169 #ifdef LOG_TO_RRD
 170
 171 #include <rrd.h>
 172
 173 #define MAX_ARGS 20
 174 #define MAX_ARG_SIZE 1024
 175
 176 static int arg_cnt;
 177 static char *arg_ptr[MAX_ARGS+1];
 178 static char arg_buf[MAX_ARG_SIZE];
 179 static int arg_pos;
 180
 181 static void arg_new(void)
 182 {
 183         arg_cnt = 1;
 184         arg_pos = 0;
 185         arg_ptr[0] = "rrdtool";
 186 }
 187
 188 static void arg_push(const char *fmt, ...)
 189 {
 190         if (arg_cnt >= MAX_ARGS)
 191                 die("MAX_ARGS exceeded");
 192         va_list va;
 193         va_start(va, fmt);
 194         int len = 1 + vsnprintf(arg_buf + arg_pos, MAX_ARG_SIZE - arg_pos, fmt, va);
 195         if (arg_pos + len > MAX_ARG_SIZE)
 196                 die("MAX_ARG_SIZE exceeded");
 197         arg_ptr[arg_cnt++] = arg_buf + arg_pos;
 198         arg_ptr[arg_cnt] = NULL;
 199         arg_pos += len;
 200 }
 201
 202 static void rrd_point(time_t t, const char *name, double val, char *unit)
 203 {
 204         char rr_name[256];
 205         snprintf(rr_name, sizeof(rr_name), "sensor-%s.rrd", name);
 206
 207         struct stat st;
 208         if (stat(rr_name, &st) < 0 || !st.st_size) {
 209                 // We have to create the RRD
 210                 log_info("Creating %s", rr_name);
 211                 arg_new();
 212                 arg_push(rr_name);
 213                 arg_push("--start");
 214                 arg_push("%d", (int) time(NULL) - 28*86400);
 215                 arg_push("--step");
 216                 arg_push("60");
 217                 if (!strcmp(unit, "%RH"))
 218                         arg_push("DS:rh:GAUGE:300:0:100");
 219                 else if (!strcmp(unit, "ppm"))
 220                         arg_push("DS:ppm:GAUGE:300:0:1000000");
 221                 else
 222                         arg_push("DS:temp:GAUGE:300:-200:200");
 223                 arg_push("RRA:AVERAGE:0.25:1:20160");           // Last 14 days with full resolution
 224                 arg_push("RRA:AVERAGE:0.25:60:88800");          // Last 10 years with 1h resolution
 225                 arg_push("RRA:MIN:0.25:60:88800");              // including minima and maxima
 226                 arg_push("RRA:MAX:0.25:60:88800");
 227                 rrd_create(arg_cnt, arg_ptr);
 228                 if (rrd_test_error()) {
 229                         log_error("rrd_create on %s failed: %s", rr_name, rrd_get_error());
 230                         rrd_clear_error();
 231                         return;
 232                 }
 233         }
 234
 235         arg_new();
 236         arg_push(rr_name);
 237         arg_push("%d:%f", t, val);
 238         rrd_update(arg_cnt, arg_ptr);
 239         if (rrd_test_error()) {
 240                 log_error("rrd_update on %s failed: %s", rr_name, rrd_get_error());
 241                 rrd_clear_error();
 242         }
 243 }
 244
 245 #endif
 246
 247 /*** Transforms ***/
 248
 249 #define TIME_OFFSET 946681200           // Timestamp of 2000-01-01 00:00:00
 250
 251 static double correct_point(uint id, double val, const char **name)
 252 {
 253         /*
 254          *  Manually calculated corrections and renames for my sensors.
 255          *  Replace with your formulae.
 256          */
 257         switch (id) {
 258                 case 10415:
 259                         *name = "terarium";
 260                         return val - 0.93;
 261                 case 10707:
 262                         *name = "catarium";
 263                         return val - 0.71;
 264                 case 11699:
 265                         *name = "garage";
 266                         return val;
 267                 case 19246:
 268                         *name = "ursarium";
 269                         return val + 0.49;
 270                 case 19247:
 271                         *name = "ursarium-rh";
 272                         return val;
 273                 case 12133:
 274                         *name = "aquarium";
 275                         return val + 0.44;
 276                 default:
 277 #ifdef IGNORE_UNKNOWN_SENSORS
 278                         *name = NULL;
 279 #endif
 280                         return val;
 281         }
 282 }
 283
 284 static void cooked_point(time_t t, uint id, double val, char *unit, int q)
 285 {
 286         char namebuf[16];
 287         snprintf(namebuf, sizeof(namebuf), "%u", id);
 288         const char *name = namebuf;
 289
 290         double val2 = correct_point(id, val, &name);
 291
 292         if (debug_raw_data) {
 293                 struct tm tm;
 294                 localtime_r(&t, &tm);
 295                 char tbuf[64];
 296                 strftime(tbuf, sizeof(tbuf), "%Y-%m-%d %H:%M:%S", &tm);
 297                 printf("== %s id=%d name=%s val=%.3f val2=%.3f unit=%s q=%d\n", tbuf, id, name, val, val2, unit, q);
 298         }
 299
 300         if (!name) {
 301                 log_error("Ignored data from unknown sensor %d", id);
 302                 return;
 303         }
 304         if (t < packet_rx_time - MAX_PAST_TIME) {
 305                 log_error("Data point from sensor %d too far in the past (%d sec)", packet_rx_time - t);
 306                 return;
 307         }
 308         if (t > packet_rx_time + MAX_FUTURE_TIME) {
 309                 log_error("Data point from sensor %d too far in the future (%d sec)", t - packet_rx_time);
 310                 return;
 311         }
 312
 313         data_point_counter++;
 314 #ifdef LOG_TO_RRD
 315         rrd_point(t, name, val2, unit);
 316 #endif
 317 #ifdef LOG_TO_MQTT
 318         mqtt_point(t, name, val2, unit);
 319 #endif
 320 }
 321
 322 static void raw_point(uint t, uint id, int raw, int q)
 323 {
 324         /*
 325          *  The binary blob provided by Arexx contains an embedded XML fragment
 326          *  with descriptions of all known sensor types. If you want to see it,
 327          *  grep the blob for "<deviceinfo>". The meanings of the parameters are
 328          *  as follows:
 329          *
 330          *      m1, m2          Device type matches if (raw_sensor_id & m1) == m2
 331          *      type            Unit measured by the sensor (1=Celsius, 2=RH%, 3=CO2 ppm)
 332          *      dm              User-visible sensor ID = raw_sensor_id & dm
 333          *      i               1 if the raw value is signed
 334          *      p[]             Coefficients of transformation polynomial (x^0 first)
 335          *      vLo, vUp        Upper and lower bound on the final value
 336          *      scale           Scaling function:
 337          *                              0 = identity (default)
 338          *                              1 = 10^x
 339          *                              2 = exp(x)
 340          *                              3 = (x < 0) ? 0 : log10(x)
 341          *                              4 = (x < 0) ? 0 : log(x)
 342          *
 343          *  The raw values are transformed this way:
 344          *      - sign-extend if signed
 345          *      - apply the transformation polynomial
 346          *      - apply the scaling function
 347          *      - drop if outside the interval [vLo,vUp]
 348          *
 349          *  This function applies the necessary transform for sensors we've
 350          *  seen in the wild. We deliberately ignore the "dm" parameter as we want
 351          *  to report different channels of a single sensor as multiple sensors.
 352          */
 353
 354         double z = raw;
 355         double hi, lo;
 356         char *unit;
 357         uint idhi = id & 0xfffff000;
 358         uint idext = id & 0xf0000000;
 359
 360         if (idhi == 0x1000) {
 361                 z = 0.02*z - 273.15;
 362                 lo = -200;
 363                 hi = 600;
 364                 unit = "C";
 365         } else if (idhi == 0x2000 || idext == 0x20000000) {
 366                 if (raw >= 0x8000)
 367                         z -= 0x10000;
 368                 z /= 128;
 369                 lo = -60;
 370                 hi = 125;
 371                 unit = "C";
 372         } else if (idhi == 0x4000) {
 373                 if (!(id & 1)) {
 374                         z = z/100 - 39.6;
 375                         lo = -60;
 376                         hi = 125;
 377                         unit = "C";
 378                 } else {
 379                         z = -2.8e-6*z*z + 0.0405*z - 4;
 380                         lo = 0;
 381                         hi = 100.1;
 382                         unit = "%RH";
 383                 }
 384         } else if (idhi == 0x6000) {
 385                 if (!(id & 1)) {
 386                         if (raw >= 0x8000)
 387                                 z -= 0x10000;
 388                         z /= 128;
 389                         lo = -60;
 390                         hi = 125;
 391                         unit = "C";
 392                 } else {
 393                         z = -3.8123e-11*z;
 394                         z = (z + 1.9184e-7) * z;
 395                         z = (z - 1.0998e-3) * z;
 396                         z += 6.56;
 397                         z = pow(10, z);
 398                         lo = 0;
 399                         hi = 1e6;
 400                         unit = "ppm";
 401                 }
 402         } else {
 403                 log_error("Unknown sensor type 0x%08x", id);
 404                 return;
 405         }
 406
 407         if (z < lo || z > hi) {
 408                 log_error("Sensor %d: value %f out of range", id, z);
 409                 return;
 410         }
 411
 412         cooked_point(t + TIME_OFFSET, id & 0x0fffffff, z, unit, q);
 413 }
 414
 415 /*** USB interface ***/
 416
 417 static int rx_endpoint, tx_endpoint;
 418
 419 static int parse_descriptors(libusb_device *dev)
 420 {
 421         int err;
 422         struct libusb_config_descriptor *desc;
 423
 424         if (err = libusb_get_active_config_descriptor(dev, &desc)) {
 425                 log_error("libusb_get_config_descriptor failed: error %d", err);
 426                 return 0;
 427         }
 428         if (desc->bNumInterfaces != 1) {
 429                 log_error("Unexpected number of interfaces: %d", desc->bNumInterfaces);
 430                 goto failed;
 431         }
 432
 433         const struct libusb_interface *iface = &desc->interface[0];
 434         if (iface->num_altsetting != 1) {
 435                 log_error("Unexpected number of alternate interface settings: %d", iface->num_altsetting);
 436                 goto failed;
 437         }
 438
 439         const struct libusb_interface_descriptor *ifd = &iface->altsetting[0];
 440         if (ifd->bNumEndpoints != 2) {
 441                 log_error("Unexpected number of endpoints: %d", ifd->bNumEndpoints);
 442                 goto failed;
 443         }
 444
 445         rx_endpoint = tx_endpoint = -1;
 446         for (int i=0; i<2; i++) {
 447                 const struct libusb_endpoint_descriptor *epd = &ifd->endpoint[i];
 448                 if (epd->bEndpointAddress & 0x80)
 449                         rx_endpoint = epd->bEndpointAddress;
 450                 else
 451                         tx_endpoint = epd->bEndpointAddress;
 452         }
 453         if (rx_endpoint < 0 || tx_endpoint < 0) {
 454                 log_error("Failed to identify endpoints");
 455                 goto failed;
 456         }
 457
 458         log_pkt("Found endpoints: rx==%02x tx=%02x\n", rx_endpoint, tx_endpoint);
 459         libusb_free_config_descriptor(desc);
 460         return 1;
 461
 462 failed:
 463         libusb_free_config_descriptor(desc);
 464         return 0;
 465 }
 466
 467 static int find_device(void)
 468 {
 469         libusb_device **devlist;
 470         ssize_t devn = libusb_get_device_list(usb_ctxt, &devlist);
 471         if (devn < 0) {
 472                 log_error("Cannot enumerate USB devices: error %d", (int) devn);
 473                 return 0;
 474         }
 475
 476         for (ssize_t i=0; i<devn; i++) {
 477                 struct libusb_device_descriptor desc;
 478                 libusb_device *dev = devlist[i];
 479                 if (!libusb_get_device_descriptor(dev, &desc)) {
 480                         if (desc.idVendor == 0x0451 && desc.idProduct == 0x3211) {
 481                                 log_info("Arexx data logger found at usb%d.%d", libusb_get_bus_number(dev), libusb_get_device_address(dev));
 482                                 if (!parse_descriptors(dev))
 483                                         continue;
 484                                 int err;
 485                                 if (err = libusb_open(dev, &devh)) {
 486                                         log_error("libusb_open() failed: error %d", err);
 487                                         goto failed;
 488                                 }
 489                                 if (err = libusb_claim_interface(devh, 0)) {
 490                                         log_error("libusb_claim_interface() failed: error %d", err);
 491                                         libusb_close(devh);
 492                                         goto failed;
 493                                 }
 494                                 libusb_free_device_list(devlist, 1);
 495                                 return 1;
 496                         }
 497                 }
 498         }
 499
 500 failed:
 501         libusb_free_device_list(devlist, 1);
 502         return 0;
 503 }
 504
 505 static void release_device(void)
 506 {
 507         libusb_release_interface(devh, 0);
 508         libusb_reset_device(devh);
 509         libusb_close(devh);
 510         devh = NULL;
 511 }
 512
 513 static void dump_packet(byte *pkt)
 514 {
 515         for (int i=0; i<64; i++) {
 516                 if (!(i % 16))
 517                         log_pkt("\t%02x:", i);
 518                 log_pkt(" %02x", pkt[i]);
 519                 if (i % 16 == 15)
 520                         log_pkt("\n");
 521         }
 522 }
 523
 524 static void my_msleep(int ms)
 525 {
 526         struct timespec ts = { .tv_sec = ms/1000, .tv_nsec = (ms%1000) * 1000000 };
 527         nanosleep(&ts, NULL);
 528 }
 529
 530 static int send_and_receive(byte *req, byte *reply)
 531 {
 532         if (debug_packets) {
 533                 time_t t = time(NULL);
 534                 struct tm tm;
 535                 localtime_r(&t, &tm);
 536
 537                 char tbuf[64];
 538                 strftime(tbuf, sizeof(tbuf), "%Y-%m-%d %H:%M:%S", &tm);
 539                 log_pkt("## %s\n", tbuf);
 540         }
 541
 542         int err, transferred;
 543         if (err = libusb_bulk_transfer(devh, tx_endpoint, req, 64, &transferred, 200)) {
 544                 if (err == LIBUSB_ERROR_TIMEOUT) {
 545                         log_pkt(">> xmit timed out\n");
 546                         return 0;
 547                 }
 548                 log_pkt(">> xmit error %d\n", err);
 549                 log_error("Transmit error: %d", err);
 550                 return err;
 551         }
 552         if (debug_packets) {
 553                 log_pkt(">> xmit %d bytes\n", transferred);
 554                 dump_packet(req);
 555         }
 556         my_msleep(1);
 557         if (err = libusb_bulk_transfer(devh, rx_endpoint, reply, 64, &transferred, 200)) {
 558                 if (err == LIBUSB_ERROR_TIMEOUT) {
 559                         log_pkt("<< recv timed out\n");
 560                         return 0;
 561                 }
 562                 log_pkt("<< recv error %d\n", err);
 563                 log_error("Receive error: %d", err);
 564                 return err;
 565         }
 566         packet_rx_time = time(NULL);
 567         if (debug_packets)
 568                 log_pkt("<< recv %d bytes\n", transferred);
 569         while (transferred < 64)
 570                 reply[transferred++] = 0xff;
 571         if (debug_packets)
 572                 dump_packet(reply);
 573         return 1;
 574 }
 575
 576 static unsigned int get_be16(byte *p)
 577 {
 578         return p[1] | (p[0] << 8);
 579 }
 580
 581 static unsigned int get_le16(byte *p)
 582 {
 583         return p[0] | (p[1] << 8);
 584 }
 585
 586 static unsigned int get_le32(byte *p)
 587 {
 588         return get_le16(p) | (get_le16(p+2) << 16);
 589 }
 590
 591 static void put_le16(byte *p, unsigned int x)
 592 {
 593         p[0] = x;
 594         p[1] = x >> 8;
 595 }
 596
 597 static void put_le32(byte *p, unsigned int x)
 598 {
 599         put_le16(p, x);
 600         put_le16(p+2, x>>16);
 601 }
 602
 603 static int parse_packet(byte *reply)
 604 {
 605         if (reply[0]) {
 606                 log_error("Unknown packet type %02x", reply[0]);
 607                 return 0;
 608         }
 609
 610         int pos = 1;
 611         int points = 0;
 612         while (pos < 64) {
 613                 byte *p = reply + pos;
 614                 int len = p[0];
 615                 if (!len || len == 0xff)
 616                         break;
 617                 if (pos + len > 64) {
 618                         log_error("Tuple truncated");
 619                         break;
 620                 }
 621
 622                 uint t, id;
 623                 int raw, q;
 624                 switch (len) {
 625                         case 9:
 626                         case 10:
 627                                 id = get_le16(p+1);
 628                                 raw = get_be16(p+3);
 629                                 t = get_le32(p+5);
 630                                 q = (len > 9) ? p[9] : -1;
 631                                 break;
 632                         case 12:
 633                                 id = get_le32(p+1);
 634                                 raw = get_be16(p+5);
 635                                 t = get_le32(p+7);
 636                                 q = p[11];
 637                                 break;
 638                         default:
 639                                 log_error("Unknown tuple length %02x", len);
 640                                 goto end;
 641                 }
 642
 643                 if (debug_raw_data) {
 644                         printf("... %02x: id=%08x raw=%d t=%u", len, id, raw, t);
 645                         if (q >= 0)
 646                                 printf(" q=%d", q);
 647                         printf("\n");
 648                 }
 649                 raw_point(t, id, raw, q);
 650                 pos += len;
 651                 points++;
 652         }
 653
 654 end:
 655         return points;
 656 }
 657
 658 static void set_clock(void)
 659 {
 660         byte req[64], reply[64];
 661         memset(req, 0, 64);
 662         req[0] = 4;
 663         time_t t = time(NULL);
 664         put_le32(req+1, t-TIME_OFFSET);
 665         send_and_receive(req, reply);
 666
 667 #if 0
 668         /*
 669          *  Original software also sends a packet with type 3 and the timestamp,
 670          *  but it does not make any sense, especially as they ignore the sensor
 671          *  readings in the answer.
 672          */
 673         req[0] = 3;
 674         send_and_receive(req, reply);
 675         parse_packet(reply);
 676 #endif
 677 }
 678
 679 /*** Main ***/
 680
 681 static sigset_t term_sigs;
 682 static volatile sig_atomic_t want_shutdown;
 683
 684 static void sigterm_handler(int sig UNUSED)
 685 {
 686         want_shutdown = 1;
 687 }
 688
 689 static void interruptible_msleep(int ms)
 690 {
 691         sigprocmask(SIG_UNBLOCK, &term_sigs, NULL);
 692         my_msleep(ms);
 693         sigprocmask(SIG_BLOCK, &term_sigs, NULL);
 694 }
 695
 696 static const struct option long_options[] = {
 697         { "debug",              0, NULL, 'd' },
 698         { "log-dir",            1, NULL, 'l' },
 699         { "no-fork",            0, NULL, 'n' },
 700         { "debug-packets",      0, NULL, 'p' },
 701         { "debug-raw",          0, NULL, 'r' },
 702         { "version",            0, NULL, 'V' },
 703         { NULL,                 0, NULL, 0 },
 704 };
 705
 706 static void usage(void)
 707 {
 708         fprintf(stderr, "\n\
 709 Usage: arexxd <options>\n\
 710 \n\
 711 Options:\n\
 712 -d, --debug             Debug mode (no chdir, no fork, no syslog)\n\
 713 -l, --log-dir=<dir>     Directory where all received data should be stored\n\
 714 -n, --no-fork           Do not fork\n\
 715 -p, --debug-packets     Log all packets sent and received\n\
 716 -r, --debug-raw         Log conversion from raw values\n\
 717 -V, --version           Show daemon version\n\
 718 ");
 719         exit(1);
 720 }
 721
 722 int main(int argc, char **argv)
 723 {
 724         int opt;
 725         while ((opt = getopt_long(argc, argv, "dl:nprV", long_options, NULL)) >= 0)
 726                 switch (opt) {
 727                         case 'd':
 728                                 debug_mode++;
 729                                 break;
 730                         case 'l':
 731                                 log_dir = optarg;
 732                                 break;
 733                         case 'n':
 734                                 no_fork++;
 735                                 break;
 736                         case 'p':
 737                                 debug_packets++;
 738                                 break;
 739                         case 'r':
 740                                 debug_raw_data++;
 741                                 break;
 742                         case 'V':
 743                                 printf("arexxd " AREXXD_VERSION "\n");
 744                                 printf("(c) 2011-2018 Martin Mares <mj@ucw.cz>\n");
 745                                 return 0;
 746                         default:
 747                                 usage();
 748                 }
 749         if (optind < argc)
 750                 usage();
 751
 752         int err;
 753         if (err = libusb_init(&usb_ctxt))
 754                 die("Cannot initialize libusb: error %d", err);
 755
 756         if (!debug_mode) {
 757                 if (chdir(log_dir) < 0)
 758                         die("Cannot change directory to %s: %m", log_dir);
 759                 if (debug_packets || debug_raw_data) {
 760                         close(1);
 761                         if (open("debug", O_WRONLY | O_CREAT | O_APPEND, 0666) < 0)
 762                                 die("Cannot open debug log: %m");
 763                         setlinebuf(stdout);
 764                 }
 765                 openlog("arexxd", LOG_NDELAY, LOG_DAEMON);
 766                 if (!no_fork) {
 767                         pid_t pid = fork();
 768                         if (pid < 0)
 769                                 die("fork() failed: %m");
 770                         if (pid)
 771                                 return 0;
 772                 }
 773                 setsid();
 774                 use_syslog = 1;
 775         }
 776
 777 #ifdef LOG_TO_MQTT
 778         mqtt_init();
 779 #endif
 780
 781         struct sigaction sa = { .sa_handler = sigterm_handler };
 782         sigaction(SIGTERM, &sa, NULL);
 783         sigaction(SIGINT, &sa, NULL);
 784
 785         sigemptyset(&term_sigs);
 786         sigaddset(&term_sigs, SIGTERM);
 787         sigaddset(&term_sigs, SIGINT);
 788         sigprocmask(SIG_BLOCK, &term_sigs, NULL);
 789
 790         int inited = 0;
 791         while (!want_shutdown) {
 792                 if (!find_device()) {
 793                         if (!inited) {
 794                                 inited = 1;
 795                                 log_error("Data logger not connected, waiting until it appears");
 796                         }
 797                         interruptible_msleep(30000);
 798                         continue;
 799                 }
 800                 log_info("Listening");
 801
 802                 time_t last_sync = 0;
 803                 time_t last_show = 0;
 804                 int want_stats = 0;
 805                 int want_sleep = 0;
 806                 data_point_counter = 0;
 807                 while (!want_shutdown) {
 808                         time_t now = time(NULL);
 809                         if (now > last_sync + 900) {
 810                                 log_info("Synchronizing data logger time");
 811                                 set_clock();
 812                                 last_sync = now;
 813                         }
 814                         if (want_stats && now > last_show + 300) {
 815                                 log_info("Stats: received %d data points", data_point_counter);
 816                                 data_point_counter = 0;
 817                                 last_show = now;
 818                         }
 819
 820                         byte req[64], reply[64];
 821                         memset(req, 0, sizeof(req));
 822                         req[0] = 3;
 823                         err = send_and_receive(req, reply);
 824                         if (err < 0)
 825                                 break;
 826                         want_sleep = 1;
 827                         if (err > 0 && parse_packet(reply))
 828                                 want_sleep = 0;
 829                         if (want_sleep) {
 830                                 interruptible_msleep(4000);
 831                                 want_stats = 1;
 832                         } else
 833                                 interruptible_msleep(5);
 834                 }
 835
 836                 log_info("Disconnecting data logger");
 837                 release_device();
 838                 inited = 0;
 839                 interruptible_msleep(10000);
 840         }
 841
 842         log_info("Terminated");
 843         return 0;
 844 }