An implementation of Analog cellular networks like A-Netz, B-Netz, C-Netz, NMT, AMPS, TACS, JTACS, Radiocom 2000, IMTS, MPT1327, Eurosignal and more http://osmocom-analog.eversberg.eu/
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osmocom-analog/src/cnetz/main.c

603 lines
24 KiB

/* C-Netz main
*
* (C) 2016 by Andreas Eversberg <jolly@eversberg.eu>
* All Rights Reserved
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "../libsample/sample.h"
#include "../libmobile/main_mobile.h"
#include "../libdebug/debug.h"
#include "../libmobile/call.h"
#include "../anetz/freiton.h"
#include "../anetz/besetztton.h"
#include "../liboptions/options.h"
#include "../libfm/fm.h"
#include "cnetz.h"
#include "database.h"
#include "sysinfo.h"
#include "dsp.h"
#include "telegramm.h"
#include "ansage.h"
/* settings */
int num_chan_type = 0;
enum cnetz_chan_type chan_type[MAX_SENDER] = { CHAN_TYPE_OGK_SPK };
int measure_speed = 0;
double clock_speed[2] = { 0.0, 0.0 };
int set_clock_speed = 0;
const char *flip_polarity = "auto";
int ms_power = 0; /* 0..3 */
int warteschlange = 1;
int challenge_valid;
uint64_t challenge;
int response_valid;
uint64_t response;
uint8_t fuz_nat = 1;
uint8_t fuz_fuvst = 1;
uint8_t fuz_rest = 38;
uint8_t kennung_fufst = 1; /* normal prio */
uint8_t authentifikationsbit = 0;
uint8_t ws_kennung = 0; /* no queue */
uint8_t fuvst_sperren = 0; /* no blocking registration/calls */
uint8_t grenz_einbuchen = 1; /* > 15 SNR */
uint8_t grenz_umschalten = 15; /* < 18 SNR */
uint8_t grenz_ausloesen = 15; /* < 18 SNR */
uint8_t mittel_umschalten = 5; /* 64 Frames */
uint8_t mittel_ausloesen = 5; /* 64 Frames */
uint8_t genauigkeit = 1; /* limited accuracy */
uint8_t bewertung = 1; /* rating by level */
uint8_t entfernung = 3; /* 3km */
uint8_t reduzierung = 0; /* factor 4 */
uint8_t nachbar_prio = 0;
int8_t futln_sperre_start = -1; /* no blocking */
int8_t futln_sperre_end = -1; /* no range */
enum demod_type demod = FSK_DEMOD_AUTO;
int metering = 20;
double dbm0_deviation = 4000.0; /* best results with all my equipment */
void print_help(const char *arg0)
{
main_mobile_print_help(arg0, "[-M] -S <rx ppm>,<tx ppm> -p -d ");
/* - - */
printf(" -T --channel-type <channel type> | list\n");
printf(" Give channel type, use 'list' to get a list. (default = '%s')\n", chan_type_short_name(chan_type[0]));
printf(" -M --measure-speed\n");
printf(" Measures clock speed. THIS IS REQUIRED! See documentation!\n");
printf(" -C --clock-speed <rx ppm>,<tx ppm>\n");
printf(" Correct speed of sound card's clock. Use '-M' to measure speed for\n");
printf(" some hours after temperature has settled. The use these results to\n");
printf(" correct signal processing speed. After adjustment, the clock must match\n");
printf(" +- 1ppm or better. CORRECTING CLOCK SPEED IS REQUIRED! See\n");
printf(" documentation on how to measure correct value.\n");
printf(" -F --flip-polarity no | yes | auto\n");
printf(" Flip polarity of transmitted FSK signal. If yes, the sound card\n");
printf(" generates a negative signal rather than a positive one. If auto, the\n");
printf(" base station generates two virtual base stations with both polarities.\n");
printf(" Once a mobile registers, the correct polarity is selected and used.\n");
printf(" (default = %s)\n", flip_polarity);
printf(" Note: This has no effect with SDR.\n");
printf(" -P --ms-power <power level>\n");
printf(" Give power level of the mobile station 0..3. (default = '%d')\n", ms_power);
printf(" 0 = 50-125 mW; 1 = 0.5-1 W; 2 = 4-8 W; 3 = 10-20 W\n");
printf(" -A --authentication <challenge>\n");
printf(" Enable authorization flag on the base station and use given challenge\n");
printf(" as autorization random. Depending on the key inside the card you will\n");
printf(" get a response. Any response is accepted. Phone must have smart card!\n");
printf(" The challenge can be any 64 bit (hex) number like: 0x0123456789abcdef\n");
printf(" Note: Authentication is automatically enabled for the base station\n");
printf(" -A --authentication <challenge>,<response>\n");
printf(" Same as above, but the given response must match the response from\n");
printf(" smart card. The response can be any 64 bit (hex) number.\n");
printf(" Note: Authentication is automatically enabled for the base station\n");
printf(" -Q --queue | --warteschlange 1 | 0\n");
printf(" Enable queue support. If no channel is available, calls will be kept\n");
printf(" in a queue for maximum of 60 seconds. (default = %d)\n", warteschlange);
printf(" -G --gebuehren <seconds> | 0\n");
printf(" Increment metering counter every given number of seconds.\n");
printf(" To turn off, use 0. (default = %d)\n", metering);
printf(" -V --voice-deviation <2400..4000 Hz>\n");
printf(" It is unclear what the actual voice deviation is. Please decrease, if\n");
printf(" mobile's microphone is too loud and speaker is too quiet.\n");
printf(" (default = %.0f)\n", dbm0_deviation);
printf(" -S --sysinfo fuz-nat=<nat>\n");
printf(" Set country ID of base station. All IDs were used inside Germany only.\n");
printf(" (default = %d)\n", fuz_nat);
printf(" -S --sysinfo fuz-fuvst=<id>\n");
printf(" Set switching center ID of base station. (default = %d)\n", fuz_fuvst);
printf(" -S --sysinfo fuz-rest=<id>\n");
printf(" Set cell ID of base station. (default = %d)\n", fuz_rest);
printf(" -S --sysinfo kennung-fufst=<id>\n");
printf(" Set priority for selecting base station. (default = %d)\n", kennung_fufst);
printf(" 0 = Test (Only special mobile stations may register.)\n");
printf(" 1 = Normal priority base station.\n");
printf(" 2 = Higher priority base station.\n");
printf(" 3 = Highest priority base station.\n");
printf(" Note: Priority has no effect, because there is only one base station.\n");
printf(" -A --sysinfo authentifikationsbit=auth>\n");
printf(" Enable authentication flag on the base station. Since we cannot\n");
printf(" authenticate, because we don't know the secret key and the algorithm,\n");
printf(" we just accept any card. Useful get the vendor IDs of the phone.\n");
printf(" 0 = Disable. Even chip card phones behave like magnetic card phones.\n");
printf(" 1 = Enable. Chip card phones send their card ID.\n");
printf(" (default = %d)\n", authentifikationsbit);
printf(" -S --sysinfo ws-kennung=<value>\n");
printf(" Queue setting of base station. (default = %d)\n", ws_kennung);
printf(" 0 = No queue, calls will be handled directly.\n");
printf(" 1 = Queue on outgoing calls.\n");
printf(" 2 = Queue blocked, no calls allowed.\n");
printf(" 3 = Reserved, don't use!\n");
printf(" -S --sysinfo fuvst-sperren=<value>\n");
printf(" Blocking registration and outgoing calls. (default = %d)\n", fuvst_sperren);
printf(" 0 = Registration and outgoing calls allowed.\n");
printf(" 1 = Only registration alloweed.\n");
printf(" 2 = Only outgoing calls allowed. (Cannot work without registration!)\n");
printf(" 3 = No registration and no outgoing calls allowed.\n");
printf(" -S --sysinfo grenz-einbuchen=<value>\n");
printf(" Minimum SNR to allow registration of mobile (default = %d)\n", grenz_einbuchen);
printf(" 0 = No limit; 1 = >15 dB; 2 = >17 dB; 3 = >19 dB\n");
printf(" 4 = >21 dB; 5 = >25 dB; 6 = >28 dB; 7 = >32 dB\n");
printf(" -S --sysinfo grenz-umschalten=<value>\n");
printf(" Minimum SNR before phone requests handover (default = %d)\n", grenz_umschalten);
printf(" 15 = 18 dB ... 0 = 26 dB (external)\n");
printf(" 13 = 16 dB ... 0 = 22 dB (internal)\n");
printf(" -S --sysinfo grenz-ausloesen=<value>\n");
printf(" Minimum SNR before phone releases of call (default = %d)\n", grenz_ausloesen);
printf(" 15 = 18 dB ... 0 = 26 dB\n");
printf(" -S --sysinfo mittel-umschalten=<value>\n");
printf(" Number of frames to measure for handover criterium (default = %d)\n", mittel_umschalten);
printf(" 0 = 2 measurements; 1 = 4 measurements; 2 = 8 measurememnts\n");
printf(" 3 = 16 measurements; 4 = 32 measurements; 5 = 64 measurememnts\n");
printf(" -S --sysinfo mittel-ausloesen=<value>\n");
printf(" Number of frames to measure for release criterium (default = %d)\n", mittel_ausloesen);
printf(" 0 = 2 measurements; 1 = 4 measurements; 2 = 8 measurememnts\n");
printf(" 3 = 16 measurements; 4 = 32 measurements; 5 = 64 measurememnts\n");
printf(" -S --sysinfo genauigkeit=<value>\n");
printf(" Accuracy of base station (default = %d)\n", genauigkeit);
printf(" 0 = full accuracy; 1 = limited accuracy\n");
printf(" Note: This has no effect, because there is only one base station.\n");
printf(" -S --sysinfo bewertung=<value>\n");
printf(" Rating of base station (default = %d)\n", bewertung);
printf(" 0 = by relative distance; 1 = by received level\n");
printf(" Note: This has no effect, because there is only one base station.\n");
printf(" -S --sysinfo entfernung=<value>\n");
printf(" Base station size (default = %d)\n", entfernung);
printf(" 0 = 1.5km; 1 = 2km; 2 = 2.5km; 3 = 3km; 4 = 5km; 5 = 5km\n");
printf(" 6 = 6km; 7 = 7km; 8 = 8km; 9 = 10km; 10 = 12km; 11 = 14km\n");
printf(" 12 = 16km; 13 = 17km; 14 = 23km; 15 = 30km\n");
printf(" Note: This has no effect, because there is only one base station.\n");
printf(" -S --sysinfo reduzierung=<value>\n");
printf(" See specs value 'y' (default = %d)\n", reduzierung);
printf(" 0 = 4; 1 = 3; 2 = 2; 3 = 1\n");
printf(" Note: This has no effect, because there is only one base station.\n");
printf(" -S --sysinfo nachbar-prio=<value>\n");
printf(" See specs value 'g' (default = %d)\n", nachbar_prio);
printf(" Note: This has no effect, because there is only one base station.\n");
printf(" -S --sysinfo futln-sperre=<value>[-<value>]\n");
printf(" Blocking registration and outgoing calls for selected mobile stations.\n");
printf(" The 4 least significant bits of the subscriber number can be given to\n");
printf(" block all matching phones. Alternatively the phone number may be given\n");
printf(" here, so that the 4 bits get calculated automatically. The optional\n");
printf(" second value can be given, to define a range - in the same way.\n");
if (futln_sperre_start < 0) {
printf(" (default = no value given)\n");
} else if (futln_sperre_end < 0) {
printf(" (default = %d)\n", futln_sperre_start);
} else {
printf(" (default = %d-%d)\n", futln_sperre_start, futln_sperre_end);
}
printf(" -D --demod auto | slope | level\n");
printf(" Adjust demodulation algorithm. Use 'slope' to detect a level change\n");
printf(" by finding the highest slope of a bit transition. It is useful, if\n");
printf(" the receiver drifts to 0 after a while, due to DC decoupling. This\n");
printf(" happens in every analog receiver and in every sound card input.\n");
printf(" Use 'level' to detect a level change by passing zero level. This\n");
printf(" requires a DC coupled signal, which is produced by SDR.\n");
printf(" Use 'auto' to select 'slope' for sound card input and 'level' for SDR\n");
printf(" input. (default = '%s')\n", (demod == FSK_DEMOD_LEVEL) ? "level" : (demod == FSK_DEMOD_SLOPE) ? "slope" : "auto");
printf("\nstation-id: Give 7 digit station-id, you don't need to enter it for every\n");
printf(" start of this program.\n");
main_mobile_print_hotkeys();
printf("Press 'i' key to dump list of currently attached subscribers.\n");
}
static int atoi_limit(const char *p, int l1, int l2)
{
int value = atoi(p);
if (l1 < l2) {
if (value < l1)
value = l1;
if (value > l2)
value = l2;
} else {
if (value < l2)
value = l2;
if (value > l1)
value = l1;
}
return value;
}
#define OPT_WARTESCHLANGE 256
static void add_options(void)
{
main_mobile_add_options();
option_add('T', "channel-type", 1);
option_add('M', "measure-speed", 0);
option_add('C', "clock-speed", 1);
option_add('F', "flip-polarity", 1);
option_add('P', "ms-power", 1);
option_add('A', "authentifikationsbit", 1);
option_add('Q', "queue", 1);
option_add(OPT_WARTESCHLANGE, "warteschlange", 1);
option_add('G', "gebuehren", 1);
option_add('V', "voice-deviation", 1);
option_add('S', "sysinfo", 1);
option_add('D', "demod", 1);
}
static int handle_options(int short_option, int argi, char **argv)
{
int rc;
const char *p;
switch (short_option) {
case 'T':
if (!strcmp(argv[argi], "list")) {
cnetz_channel_list();
return 0;
}
rc = cnetz_channel_by_short_name(argv[argi]);
if (rc < 0) {
fprintf(stderr, "Error, channel type '%s' unknown. Please use '-t list' to get a list. I suggest to use the default.\n", argv[argi]);
return -EINVAL;
}
OPT_ARRAY(num_chan_type, chan_type, rc)
break;
case 'M':
measure_speed = 1;
break;
case 'C':
p = strchr(argv[argi], ',');
if (!p) {
fprintf(stderr, "Illegal clock speed, use two values, separated by comma and no spaces!\n");
return -EINVAL;
}
clock_speed[0] = strtold(argv[argi], NULL);
clock_speed[1] = strtold(p + 1, NULL);
set_clock_speed = 1;
break;
case 'F':
if (!strcasecmp(argv[argi], "no"))
flip_polarity = "no";
else if (!strcasecmp(argv[argi], "yes"))
flip_polarity = "yes";
else if (!strcasecmp(argv[argi], "auto"))
flip_polarity = "auto";
else {
fprintf(stderr, "Given polarity '%s' is illegal, use '-h' for help!\n", argv[argi]);
return -EINVAL;
}
break;
case 'P':
ms_power = atoi_limit(argv[argi], 0, 3);
break;
case 'A':
authentifikationsbit = 1;
challenge_valid = 1;
challenge = strtoul(argv[argi], NULL, 0);
p = strchr(argv[argi], ',');
if (p) {
response_valid = 1;
response = strtoul(p + 1, NULL, 0);
}
break;
case 'Q':
case OPT_WARTESCHLANGE:
warteschlange = atoi_limit(argv[argi], 0, 1);
break;
case 'G':
metering = atoi(argv[argi]);
break;
case 'V':
dbm0_deviation = atoi_limit(argv[argi], 2400, 4000);
break;
case 'S':
p = strchr(argv[argi], '=');
if (!p) {
fprintf(stderr, "Given sysinfo parameter '%s' requires '=' character to set value, use '-h' for help!\n", argv[argi]);
return -EINVAL;
}
p++;
if (!strncasecmp(argv[argi], "fuz-nat=", p - argv[argi])) {
fuz_nat = atoi_limit(p, 0, 7);
} else
if (!strncasecmp(argv[argi], "fuz-fuvst=", p - argv[argi])) {
fuz_fuvst = atoi_limit(p, 0, 32);
} else
if (!strncasecmp(argv[argi], "fuz-rest=", p - argv[argi])) {
fuz_rest = atoi_limit(p, 0, 255);
} else
if (!strncasecmp(argv[argi], "kennung-fufst=", p - argv[argi])) {
kennung_fufst = atoi_limit(p, 0, 3);
} else
if (!strncasecmp(argv[argi], "auth=", p - argv[argi])) {
authentifikationsbit = atoi_limit(p, 0, 1);
} else
if (!strncasecmp(argv[argi], "ws-kennung=", p - argv[argi])) {
ws_kennung = atoi_limit(p, 0, 3);
} else
if (!strncasecmp(argv[argi], "fuvst-sperren=", p - argv[argi])) {
fuvst_sperren = atoi_limit(p, 0, 3);
} else
if (!strncasecmp(argv[argi], "grenz-einbuchen=", p - argv[argi])) {
grenz_einbuchen = atoi_limit(p, 0, 7);
} else
if (!strncasecmp(argv[argi], "grenz-umschalten=", p - argv[argi])) {
grenz_umschalten = atoi_limit(p, 0, 15);
} else
if (!strncasecmp(argv[argi], "grenz-ausloesen=", p - argv[argi])) {
grenz_ausloesen = atoi_limit(p, 0, 15);
} else
if (!strncasecmp(argv[argi], "mittel-umschalten=", p - argv[argi])) {
mittel_umschalten = atoi_limit(p, 0, 5);
} else
if (!strncasecmp(argv[argi], "mittel-ausloesen=", p - argv[argi])) {
mittel_ausloesen = atoi_limit(p, 0, 5);
} else
if (!strncasecmp(argv[argi], "genauigkeit=", p - argv[argi])) {
genauigkeit = atoi_limit(p, 0, 1);
} else
if (!strncasecmp(argv[argi], "bewertung=", p - argv[argi])) {
bewertung = atoi_limit(p, 0, 1);
} else
if (!strncasecmp(argv[argi], "entfernung=", p - argv[argi])) {
entfernung = atoi_limit(p, 0, 15);
} else
if (!strncasecmp(argv[argi], "nachbar-prio=", p - argv[argi])) {
nachbar_prio = atoi_limit(p, 0, 1);
} else
if (!strncasecmp(argv[argi], "futln-sperre=", p - argv[argi])) {
char value[128], *v, *q;
strncpy(value, p, sizeof(value) - 1);
value[sizeof(value) - 1] = '\0';
v = value;
q = strchr(value, '-');
if (q)
*q++ = '\0';
if (strlen(v) > 5)
v += strlen(v) - 5;
futln_sperre_start = atoi(v) & 0xf;
if (q) {
if (strlen(q) > 5)
q += strlen(q) - 5;
futln_sperre_end = atoi(q) & 0xf;
}
} else
{
fprintf(stderr, "Given sysinfo parameter '%s' unknown, use '-h' for help!\n", argv[argi]);
return -EINVAL;
}
break;
case 'D':
if (!strcasecmp(argv[argi], "auto"))
demod = FSK_DEMOD_AUTO;
else if (!strcasecmp(argv[argi], "slope"))
demod = FSK_DEMOD_SLOPE;
else if (!strcasecmp(argv[argi], "level"))
demod = FSK_DEMOD_LEVEL;
else {
fprintf(stderr, "Given demodulation type '%s' is illegal, use '-h' for help!\n", argv[argi]);
return -EINVAL;
}
break;
default:
return main_mobile_handle_options(short_option, argi, argv);
}
return 1;
}
int main(int argc, char *argv[])
{
int rc, argi;
const char *station_id = "";
int mandatory = 0;
int polarity;
int teilnehmergruppensperre = 0;
int anzahl_gesperrter_teilnehmergruppen = 0;
int i;
/* init common tones */
init_freiton();
init_besetzton();
init_ansage();
main_mobile_init();
/* handle options / config file */
add_options();
rc = options_config_file("~/.osmocom/analog/cnetz.conf", handle_options);
if (rc < 0)
return 0;
argi = options_command_line(argc, argv, handle_options);
if (argi <= 0)
return argi;
if (argi < argc) {
station_id = argv[argi];
if (strlen(station_id) != 7) {
printf("Given station ID '%s' does not have 7 digits\n", station_id);
return 0;
}
}
if (!num_kanal) {
printf("No channel (\"Kanal\") is specified, I suggest channel %d.\n\n", CNETZ_OGK_KANAL);
mandatory = 1;
}
if (use_sdr) {
/* set audiodev */
for (i = 0; i < num_kanal; i++)
audiodev[i] = "sdr";
num_audiodev = num_kanal;
/* set channel types for more than 1 channel */
if (num_kanal > 1 && num_chan_type == 0) {
chan_type[0] = CHAN_TYPE_OGK;
for (i = 1; i < num_kanal; i++)
chan_type[i] = CHAN_TYPE_SPK;
num_chan_type = num_kanal;
}
}
if (num_kanal == 1 && num_audiodev == 0)
num_audiodev = 1; /* use default */
if (num_kanal != num_audiodev) {
fprintf(stderr, "You need to specify as many sound devices as you have channels.\n");
exit(0);
}
if (num_kanal == 1 && num_chan_type == 0)
num_chan_type = 1; /* use default */
if (num_kanal != num_chan_type) {
fprintf(stderr, "You need to specify as many channel types as you have channels.\n");
exit(0);
}
if (!set_clock_speed && !measure_speed && !use_sdr) {
printf("No clock speed given. You need to measure clock using '-M' and later correct clock using '-S <rx ppm>,<tx ppm>'. See documentation for help!\n\n");
mandatory = 1;
}
if (mandatory) {
print_help(argv[0]);
return 0;
}
/* inits */
fm_init(fast_math);
scrambler_init();
if (futln_sperre_start >= 0) {
teilnehmergruppensperre = futln_sperre_start;
if (futln_sperre_end >= 0)
anzahl_gesperrter_teilnehmergruppen = ((futln_sperre_end - futln_sperre_start) & 0xf) + 1;
else
anzahl_gesperrter_teilnehmergruppen = 1;
}
if (anzahl_gesperrter_teilnehmergruppen)
printf("Blocked subscriber with number's last 4 bits from 0x%x to 0x%x\n", teilnehmergruppensperre, (teilnehmergruppensperre + anzahl_gesperrter_teilnehmergruppen - 1) & 0xf);
init_sysinfo(fuz_nat, fuz_fuvst, fuz_rest, kennung_fufst, authentifikationsbit, ws_kennung, fuvst_sperren, grenz_einbuchen, grenz_umschalten, grenz_ausloesen, mittel_umschalten, mittel_ausloesen, genauigkeit, bewertung, entfernung, reduzierung, nachbar_prio, teilnehmergruppensperre, anzahl_gesperrter_teilnehmergruppen);
dsp_init();
rc = init_telegramm();
if (rc < 0) {
fprintf(stderr, "Error in Telegramm structure. Quitting!\n");
goto fail;
}
init_coding();
cnetz_init();
/* check for mandatory OgK */
for (i = 0; i < num_kanal; i++) {
if (chan_type[i] == CHAN_TYPE_OGK || chan_type[i] == CHAN_TYPE_OGK_SPK)
break;
}
if (i == num_kanal) {
fprintf(stderr, "You must define at least one OgK (control) or OgK/SPK (control/speech) channel type. Quitting!\n");
goto fail;
}
/* OgK must be the first channel, so it becomes master. This is required for syncing SPK channels */
if (i != 0) {
fprintf(stderr, "The first channel you defined must be OgK (control) or OgK/SPK (control/speech) channel type. Quitting!\n");
goto fail;
}
/* check for mandatory OgK */
for (i = 0; i < num_kanal; i++) {
if (chan_type[i] == CHAN_TYPE_SPK || chan_type[i] == CHAN_TYPE_OGK_SPK)
break;
}
if (i == num_kanal)
fprintf(stderr, "You did not define any SpK (speech) channel. You will not be able to make any call.\n");
/* SDR always requires emphasis */
if (use_sdr) {
do_pre_emphasis = 1;
do_de_emphasis = 1;
}
if (!do_pre_emphasis || !do_de_emphasis) {
fprintf(stderr, "*******************************************************************************\n");
fprintf(stderr, "I strongly suggest to let me do pre- and de-emphasis (options -p -d)!\n");
fprintf(stderr, "Use a transmitter/receiver without emphasis and let me do that!\n");
fprintf(stderr, "Because carrier FSK signaling and scrambled voice (default) does not use\n");
fprintf(stderr, "emphasis, I like to control emphasis by myself for best results.\n");
fprintf(stderr, "*******************************************************************************\n");
}
polarity = 0; /* auto */
if (!strcmp(flip_polarity, "no"))
polarity = 1; /* positive */
if (!strcmp(flip_polarity, "yes"))
polarity = -1; /* negative */
if (use_sdr && polarity == 0)
polarity = 1; /* SDR is always positive */
/* demodulation algorithm */
if (demod == FSK_DEMOD_AUTO)
demod = (use_sdr) ? FSK_DEMOD_LEVEL : FSK_DEMOD_SLOPE;
if (demod == FSK_DEMOD_LEVEL && !use_sdr) {
fprintf(stderr, "*******************************************************************************\n");
fprintf(stderr, "I strongly suggest to use 'slope' demodulation algorithm!!!\n");
fprintf(stderr, "Using sound card will cause the DC levels to return to 0. Using 'level' assumes\n");
fprintf(stderr, "that a frequency offset never returns to 0. (Use this only with SDR.)\n");
fprintf(stderr, "*******************************************************************************\n");
}
/* create transceiver instance */
for (i = 0; i < num_kanal; i++) {
rc = cnetz_create(kanal[i], chan_type[i], audiodev[i], use_sdr, demod, samplerate, rx_gain, challenge_valid, challenge, response_valid, response, warteschlange, metering, dbm0_deviation, ms_power, (i == 0) ? measure_speed : 0, clock_speed, polarity, do_pre_emphasis, do_de_emphasis, write_rx_wave, write_tx_wave, read_rx_wave, read_tx_wave, loopback);
if (rc < 0) {
fprintf(stderr, "Failed to create \"Sender\" instance. Quitting!\n");
goto fail;
}
if ((kanal[i] & 1)) {
printf("Base station on channel %d ready, please tune transmitter to %.3f MHz and receiver to %.3f MHz. (%.3f MHz offset)\n", kanal[i], cnetz_kanal2freq(kanal[i], 0) / 1e6, cnetz_kanal2freq(kanal[i], 1) / 1e6, cnetz_kanal2freq(kanal[i], 2) / 1e6);
} else {
printf("Base station on channel %d ready, please tune transmitter to %.4f MHz and receiver to %.4f MHz. (%.3f MHz offset)\n", kanal[i], cnetz_kanal2freq(kanal[i], 0) / 1e6, cnetz_kanal2freq(kanal[i], 1) / 1e6, cnetz_kanal2freq(kanal[i], 2) / 1e6);
}
}
main_mobile(&quit, latency, interval, NULL, station_id, 7);
fail:
flush_db();
/* destroy transceiver instance */
while (sender_head)
cnetz_destroy(sender_head);
/* exits */
fm_exit();
return 0;
}