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srsRAN_4G/srsapps/ue/mac/test/mac_test.cc

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/**
*
* \section COPYRIGHT
*
* Copyright 2013-2015 The srsLTE Developers. See the
* COPYRIGHT file at the top-level directory of this distribution.
*
* \section LICENSE
*
* This file is part of the srsLTE library.
*
* srsLTE is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* srsLTE 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 Affero General Public License for more details.
*
* A copy of the GNU Affero General Public License can be found in
* the LICENSE file in the top-level directory of this distribution
* and at http://www.gnu.org/licenses/.
*
*/
#include <unistd.h>
#include "liblte_rrc.h"
#include "srsapps/radio/radio_uhd.h"
#include "srsapps/ue/phy/phy.h"
#include "srsapps/common/tti_sync_cv.h"
#include "srsapps/common/log_stdout.h"
#include "srsapps/ue/mac/mac.h"
/**********************************************************************
* Program arguments processing
***********************************************************************/
typedef struct {
float uhd_rx_freq;
float uhd_tx_freq;
float uhd_rx_gain;
float uhd_tx_gain;
int verbose;
}prog_args_t;
void args_default(prog_args_t *args) {
args->uhd_rx_freq = -1.0;
args->uhd_tx_freq = -1.0;
args->uhd_rx_gain = -1; // set to autogain
args->uhd_tx_gain = -1;
args->verbose = 0;
}
void usage(prog_args_t *args, char *prog) {
printf("Usage: %s [gv] -f rx_frequency (in Hz) -F tx_frequency (in Hz)\n", prog);
printf("\t-g UHD RX gain [Default AGC]\n");
printf("\t-G UHD TX gain [Default same as RX gain (AGC)]\n");
printf("\t-v [increase verbosity, default none]\n");
}
void parse_args(prog_args_t *args, int argc, char **argv) {
int opt;
args_default(args);
while ((opt = getopt(argc, argv, "gGfFv")) != -1) {
switch (opt) {
case 'g':
args->uhd_rx_gain = atof(argv[optind]);
break;
case 'G':
args->uhd_tx_gain = atof(argv[optind]);
break;
case 'f':
args->uhd_rx_freq = atof(argv[optind]);
break;
case 'F':
args->uhd_tx_freq = atof(argv[optind]);
break;
case 'v':
args->verbose++;
break;
default:
usage(args, argv[0]);
exit(-1);
}
}
if (args->uhd_rx_freq < 0 || args->uhd_tx_freq < 0) {
usage(args, argv[0]);
exit(-1);
}
}
// Determine SI messages scheduling as in 36.331 5.2.3 Acquisition of an SI message
uint32_t sib_start_tti(uint32_t tti, uint32_t period, uint32_t x) {
return (period*10*(1+tti/(period*10))+x)%10240; // the 1 means next opportunity
}
void setup_mac_phy_sib2(LIBLTE_RRC_SYS_INFO_BLOCK_TYPE_2_STRUCT *sib2, srslte::ue::mac *mac, srslte::ue::phy *phy) {
// RACH-CONFIGCOMMON
if (sib2->rr_config_common_sib.rach_cnfg.preambles_group_a_cnfg.present) {
mac->set_param(srslte::ue::mac_params::RA_NOFGROUPAPREAMBLES,
liblte_rrc_message_size_group_a_num[sib2->rr_config_common_sib.rach_cnfg.preambles_group_a_cnfg.size_of_ra]);
mac->set_param(srslte::ue::mac_params::RA_MESSAGESIZEA,
liblte_rrc_message_size_group_a_num[sib2->rr_config_common_sib.rach_cnfg.preambles_group_a_cnfg.msg_size]);
mac->set_param(srslte::ue::mac_params::RA_MESSAGEPOWEROFFSETB,
liblte_rrc_message_power_offset_group_b_num[sib2->rr_config_common_sib.rach_cnfg.preambles_group_a_cnfg.msg_pwr_offset_group_b]);
}
mac->set_param(srslte::ue::mac_params::RA_NOFPREAMBLES,
liblte_rrc_number_of_ra_preambles_num[sib2->rr_config_common_sib.rach_cnfg.num_ra_preambles]);
mac->set_param(srslte::ue::mac_params::RA_POWERRAMPINGSTEP,
liblte_rrc_power_ramping_step_num[sib2->rr_config_common_sib.rach_cnfg.pwr_ramping_step]);
mac->set_param(srslte::ue::mac_params::RA_INITRECEIVEDPOWER,
liblte_rrc_preamble_initial_received_target_power_num[sib2->rr_config_common_sib.rach_cnfg.preamble_init_rx_target_pwr]);
mac->set_param(srslte::ue::mac_params::RA_PREAMBLETRANSMAX,
liblte_rrc_preamble_trans_max_num[sib2->rr_config_common_sib.rach_cnfg.preamble_trans_max]);
mac->set_param(srslte::ue::mac_params::RA_RESPONSEWINDOW,
liblte_rrc_ra_response_window_size_num[sib2->rr_config_common_sib.rach_cnfg.ra_resp_win_size]);
mac->set_param(srslte::ue::mac_params::RA_CONTENTIONTIMER,
liblte_rrc_mac_contention_resolution_timer_num[sib2->rr_config_common_sib.rach_cnfg.mac_con_res_timer]);
mac->set_param(srslte::ue::mac_params::HARQ_MAXMSG3TX,
sib2->rr_config_common_sib.rach_cnfg.max_harq_msg3_tx);
printf("Set RACH ConfigCommon: NofPreambles=%d, ResponseWindow=%d, ContentionResolutionTimer=%d ms, MaxTrials=%d\n",
liblte_rrc_number_of_ra_preambles_num[sib2->rr_config_common_sib.rach_cnfg.num_ra_preambles],
liblte_rrc_ra_response_window_size_num[sib2->rr_config_common_sib.rach_cnfg.ra_resp_win_size],
liblte_rrc_mac_contention_resolution_timer_num[sib2->rr_config_common_sib.rach_cnfg.mac_con_res_timer],
liblte_rrc_preamble_trans_max_num[sib2->rr_config_common_sib.rach_cnfg.preamble_trans_max]);
// PDSCH ConfigCommon
mac->set_param(srslte::ue::mac_params::PDSCH_RSPOWER,
sib2->rr_config_common_sib.pdsch_cnfg.rs_power);
mac->set_param(srslte::ue::mac_params::PDSCH_PB,
sib2->rr_config_common_sib.pdsch_cnfg.p_b);
// PUSCH ConfigCommon
phy->set_param(srslte::ue::phy_params::PUSCH_BETA, 10);
phy->set_param(srslte::ue::phy_params::PUSCH_EN_64QAM,
sib2->rr_config_common_sib.pusch_cnfg.enable_64_qam);
phy->set_param(srslte::ue::phy_params::PUSCH_HOPPING_OFFSET,
sib2->rr_config_common_sib.pusch_cnfg.pusch_hopping_offset);
phy->set_param(srslte::ue::phy_params::PUSCH_HOPPING_N_SB,
sib2->rr_config_common_sib.pusch_cnfg.n_sb);
phy->set_param(srslte::ue::phy_params::PUSCH_HOPPING_INTRA_SF,
sib2->rr_config_common_sib.pusch_cnfg.hopping_mode == LIBLTE_RRC_HOPPING_MODE_INTRA_AND_INTER_SUBFRAME?1:0);
phy->set_param(srslte::ue::phy_params::PUSCH_RS_GROUP_HOPPING_EN,
sib2->rr_config_common_sib.pusch_cnfg.ul_rs.group_hopping_enabled?1:0);
phy->set_param(srslte::ue::phy_params::PUSCH_RS_SEQUENCE_HOPPING_EN,
sib2->rr_config_common_sib.pusch_cnfg.ul_rs.sequence_hopping_enabled?1:0);
phy->set_param(srslte::ue::phy_params::PUSCH_RS_CYCLIC_SHIFT,
sib2->rr_config_common_sib.pusch_cnfg.ul_rs.cyclic_shift);
phy->set_param(srslte::ue::phy_params::PUSCH_RS_GROUP_ASSIGNMENT,
sib2->rr_config_common_sib.pusch_cnfg.ul_rs.group_assignment_pusch);
printf("Set PUSCH ConfigCommon: HopOffset=%d, RSGroup=%d, RSNcs=%d, N_sb=%d\n",
sib2->rr_config_common_sib.pusch_cnfg.pusch_hopping_offset,
sib2->rr_config_common_sib.pusch_cnfg.ul_rs.group_assignment_pusch,
sib2->rr_config_common_sib.pusch_cnfg.ul_rs.cyclic_shift,
sib2->rr_config_common_sib.pusch_cnfg.n_sb);
// PUCCH ConfigCommon
phy->set_param(srslte::ue::phy_params::PUCCH_BETA, 10);
phy->set_param(srslte::ue::phy_params::PUCCH_DELTA_SHIFT,
liblte_rrc_delta_pucch_shift_num[sib2->rr_config_common_sib.pucch_cnfg.delta_pucch_shift]);
phy->set_param(srslte::ue::phy_params::PUCCH_CYCLIC_SHIFT,
sib2->rr_config_common_sib.pucch_cnfg.n_cs_an);
phy->set_param(srslte::ue::phy_params::PUCCH_N_PUCCH_1,
sib2->rr_config_common_sib.pucch_cnfg.n1_pucch_an);
phy->set_param(srslte::ue::phy_params::PUCCH_N_RB_2,
sib2->rr_config_common_sib.pucch_cnfg.n_rb_cqi);
printf("Set PUCCH ConfigCommon: DeltaShift=%d, CyclicShift=%d, N1=%d, NRB=%d\n",
liblte_rrc_delta_pucch_shift_num[sib2->rr_config_common_sib.pucch_cnfg.delta_pucch_shift],
sib2->rr_config_common_sib.pucch_cnfg.n_cs_an,
sib2->rr_config_common_sib.pucch_cnfg.n1_pucch_an,
sib2->rr_config_common_sib.pucch_cnfg.n_rb_cqi);
// PRACH Configcommon
phy->set_param(srslte::ue::phy_params::PRACH_ROOT_SEQ_IDX,
sib2->rr_config_common_sib.prach_cnfg.root_sequence_index);
phy->set_param(srslte::ue::phy_params::PRACH_HIGH_SPEED_FLAG,
sib2->rr_config_common_sib.prach_cnfg.prach_cnfg_info.high_speed_flag?1:0);
phy->set_param(srslte::ue::phy_params::PRACH_FREQ_OFFSET,
sib2->rr_config_common_sib.prach_cnfg.prach_cnfg_info.prach_freq_offset);
phy->set_param(srslte::ue::phy_params::PRACH_ZC_CONFIG,
sib2->rr_config_common_sib.prach_cnfg.prach_cnfg_info.zero_correlation_zone_config);
phy->set_param(srslte::ue::phy_params::PRACH_CONFIG_INDEX,
sib2->rr_config_common_sib.prach_cnfg.prach_cnfg_info.prach_config_index);
printf("Set PRACH ConfigCommon: SeqIdx=%d, HS=%d, FreqOffset=%d, ZC=%d, ConfigIndex=%d\n",
sib2->rr_config_common_sib.prach_cnfg.root_sequence_index,
sib2->rr_config_common_sib.prach_cnfg.prach_cnfg_info.high_speed_flag?1:0,
sib2->rr_config_common_sib.prach_cnfg.prach_cnfg_info.prach_freq_offset,
sib2->rr_config_common_sib.prach_cnfg.prach_cnfg_info.zero_correlation_zone_config,
sib2->rr_config_common_sib.prach_cnfg.prach_cnfg_info.prach_config_index);
}
void process_connsetup(LIBLTE_RRC_CONNECTION_SETUP_STRUCT *msg, srslte::ue::mac *mac, srslte::ue::phy *phy) {
// FIXME: There's an error parsing the connectionSetup message. This value is hard-coded:
phy->set_param(srslte::ue::phy_params::SR_PUCCH_RESINDEX,
msg->rr_cnfg.phy_cnfg_ded.sched_request_cnfg.sr_pucch_resource_idx);
phy->set_param(srslte::ue::phy_params::SR_CONFIG_INDEX,
msg->rr_cnfg.phy_cnfg_ded.sched_request_cnfg.sr_cnfg_idx);
phy->set_param(srslte::ue::phy_params::UCI_I_OFFSET_ACK, msg->rr_cnfg.phy_cnfg_ded.pusch_cnfg_ded.beta_offset_ack_idx);
phy->set_param(srslte::ue::phy_params::UCI_I_OFFSET_CQI, msg->rr_cnfg.phy_cnfg_ded.pusch_cnfg_ded.beta_offset_cqi_idx);
phy->set_param(srslte::ue::phy_params::UCI_I_OFFSET_RI, msg->rr_cnfg.phy_cnfg_ded.pusch_cnfg_ded.beta_offset_ri_idx);
printf("Set PHY configuration: n_pucch=%d, configIndex=%d\n",
msg->rr_cnfg.phy_cnfg_ded.sched_request_cnfg.sr_pucch_resource_idx,
msg->rr_cnfg.phy_cnfg_ded.sched_request_cnfg.sr_cnfg_idx);
mac->set_param(srslte::ue::mac_params::HARQ_MAXTX,
liblte_rrc_max_harq_tx_num[msg->rr_cnfg.mac_main_cnfg.explicit_value.ulsch_cnfg.max_harq_tx]);
mac->set_param(srslte::ue::mac_params::SR_TRANS_MAX,
liblte_rrc_dsr_trans_max_num[msg->rr_cnfg.phy_cnfg_ded.sched_request_cnfg.dsr_trans_max]);
mac->set_param(srslte::ue::mac_params::SR_PUCCH_CONFIGURED, 1);
mac->set_param(srslte::ue::mac_params::BSR_TIMER_RETX,
liblte_rrc_retransmission_bsr_timer_num[msg->rr_cnfg.mac_main_cnfg.explicit_value.ulsch_cnfg.retx_bsr_timer]);
mac->set_param(srslte::ue::mac_params::BSR_TIMER_PERIODIC,
liblte_rrc_periodic_bsr_timer_num[msg->rr_cnfg.mac_main_cnfg.explicit_value.ulsch_cnfg.periodic_bsr_timer]);
printf("Set MAC configuration: dsr-TransMAX: %d, harq-MaxReTX=%d, bsr-TimerReTX=%d, bsr-TimerPeriodic=%d\n",
liblte_rrc_dsr_trans_max_num[msg->rr_cnfg.phy_cnfg_ded.sched_request_cnfg.dsr_trans_max],
liblte_rrc_max_harq_tx_num[msg->rr_cnfg.mac_main_cnfg.explicit_value.ulsch_cnfg.max_harq_tx],
liblte_rrc_retransmission_bsr_timer_num[msg->rr_cnfg.mac_main_cnfg.explicit_value.ulsch_cnfg.retx_bsr_timer],
liblte_rrc_periodic_bsr_timer_num[msg->rr_cnfg.mac_main_cnfg.explicit_value.ulsch_cnfg.periodic_bsr_timer]);
// Setup radio bearers
for (int i=0;i<msg->rr_cnfg.srb_to_add_mod_list_size;i++) {
if (msg->rr_cnfg.srb_to_add_mod_list[i].lc_default_cnfg_present) {
printf("Setting up Default Configuration for SRB%d \n", msg->rr_cnfg.srb_to_add_mod_list[i].srb_id);
switch(msg->rr_cnfg.srb_to_add_mod_list[i].srb_id) {
case 1:
mac->setup_lcid(1, 0, 1, -1, -1);
break;
case 2:
mac->setup_lcid(2, 0, 3, -1, -1);
break;
}
}
}
for (int i=0;i<msg->rr_cnfg.drb_to_add_mod_list_size;i++) {
printf("Setting up DRB%d\n", msg->rr_cnfg.drb_to_add_mod_list[i].drb_id);
// todo
}
}
// Hex bytes for the connection setup complete packet
// Got hex bytes from http://www.sharetechnote.com/html/RACH_LTE.html
uint8_t setupComplete_segm[2][41] ={ {
0x88, 0x00, 0x00, 0x20, 0x21, 0x90, 0xa0, 0x12, 0x00, 0x00, 0x80, 0xf0, 0x5e, 0x3b, 0xf1, 0x04,
0x64, 0x04, 0x1d, 0x20, 0x44, 0x2f, 0xd8, 0x4b, 0xd1, 0x02, 0x00, 0x00, 0x83, 0x03, 0x41, 0xb0,
0xe5, 0x60, 0x13, 0x81, 0x83},
{0xb0, 0x01, 0x01, 0x01, 0x48, 0x4b, 0xd1, 0x00, 0x7d, 0x21, 0x70, 0x28, 0x01, 0x5c, 0x08, 0x80,
0x00, 0xc4, 0x0f, 0x97, 0x80, 0xd0, 0x4c, 0x4b, 0xd1, 0x00, 0xc0, 0x58, 0x44, 0x0d, 0x5d, 0x62,
0x99, 0x74, 0x04, 0x03, 0x80, 0x00, 0x00, 0x00, 0x00}
};
uint32_t lengths[2] = {37, 41};
uint8_t reply[2] = {0x00, 0x04};
int main(int argc, char *argv[])
{
prog_args_t prog_args;
srslte::ue::tti_sync_cv ttisync(10240);
srslte::radio_uhd radio_uhd;
srslte::ue::phy phy;
srslte::ue::mac mac;
srslte::log_stdout mac_log("MAC"), phy_log("PHY");
parse_args(&prog_args, argc, argv);
switch (prog_args.verbose) {
case 1:
mac_log.set_level_info();
phy_log.set_level_info();
break;
case 2:
mac_log.set_level_debug();
phy_log.set_level_debug();
break;
}
// Init Radio and PHY
if (prog_args.uhd_rx_gain > 0 && prog_args.uhd_tx_gain > 0) {
radio_uhd.init();
radio_uhd.set_rx_gain(prog_args.uhd_rx_gain);
radio_uhd.set_tx_gain(prog_args.uhd_tx_gain);
phy.init(&radio_uhd, &ttisync, &phy_log);
} else {
radio_uhd.init_agc();
radio_uhd.set_tx_rx_gain_offset(0);
phy.init_agc(&radio_uhd, &ttisync, &phy_log);
}
// Init MAC
mac.init(&phy, &ttisync, &mac_log);
// Set RX freq
radio_uhd.set_rx_freq(prog_args.uhd_rx_freq);
radio_uhd.set_tx_freq(prog_args.uhd_tx_freq);
LIBLTE_BIT_MSG_STRUCT bit_msg;
LIBLTE_RRC_MIB_STRUCT bch_msg;
LIBLTE_RRC_BCCH_DLSCH_MSG_STRUCT dlsch_msg;
LIBLTE_RRC_UL_CCCH_MSG_STRUCT ul_ccch_msg;
LIBLTE_RRC_DL_CCCH_MSG_STRUCT dl_ccch_msg;
uint32_t si_window_len, sib2_period;
int tti;
enum {START, SIB1, SIB2, CONNECT, SETUPCOMPLETE, IDLE} state = START;
int n;
while(1) {
switch(state) {
case START:
n = mac.recv_bcch_sdu(bit_msg.msg, LIBLTE_MAX_MSG_SIZE);
if (n > 0) {
bit_msg.N_bits = n;
liblte_rrc_unpack_bcch_bch_msg(&bit_msg, &bch_msg);
printf("MIB received %d bytes, BW=%s\n", n, liblte_rrc_dl_bandwidth_text[bch_msg.dl_bw]);
state = SIB1;
}
break;
case SIB1:
n = mac.recv_bcch_sdu(bit_msg.msg, LIBLTE_MAX_MSG_SIZE);
if (n > 0) {
bit_msg.N_bits = n;
liblte_rrc_unpack_bcch_dlsch_msg(&bit_msg, &dlsch_msg);
si_window_len = liblte_rrc_si_window_length_num[dlsch_msg.sibs[0].sib.sib1.si_window_length];
sib2_period = liblte_rrc_si_periodicity_num[dlsch_msg.sibs[0].sib.sib1.sched_info[0].si_periodicity];
printf("SIB1 received %d bytes, CellID=%d, si_window=%d, sib2_period=%d\n",
n/8, dlsch_msg.sibs[0].sib.sib1.cell_id&0xfff, si_window_len, sib2_period);
state = SIB2;
} else {
tti = mac.get_tti();
mac.set_param(srslte::ue::mac_params::BCCH_SI_WINDOW_ST, sib_start_tti(tti, 2, 5));
mac.set_param(srslte::ue::mac_params::BCCH_SI_WINDOW_LEN, 1);
}
break;
case SIB2:
n = mac.recv_bcch_sdu(bit_msg.msg, LIBLTE_MAX_MSG_SIZE);
if (n > 0) {
// Process SIB2
bit_msg.N_bits = n;
liblte_rrc_unpack_bcch_dlsch_msg(&bit_msg, &dlsch_msg);
printf("SIB2 received %d bytes\n", n/8);
setup_mac_phy_sib2(&dlsch_msg.sibs[0].sib.sib2, &mac, &phy);
// Prepare ConnectionRequest packet
ul_ccch_msg.msg_type = LIBLTE_RRC_UL_CCCH_MSG_TYPE_RRC_CON_REQ;
ul_ccch_msg.msg.rrc_con_req.ue_id_type = LIBLTE_RRC_CON_REQ_UE_ID_TYPE_RANDOM_VALUE;
ul_ccch_msg.msg.rrc_con_req.ue_id.random = 1000;
ul_ccch_msg.msg.rrc_con_req.cause = LIBLTE_RRC_CON_REQ_EST_CAUSE_MO_SIGNALLING;
liblte_rrc_pack_ul_ccch_msg(&ul_ccch_msg, &bit_msg);
uint64_t uecri=0;
uint8_t *ue_cri_ptr = (uint8_t*) &uecri;
uint32_t nbytes = bit_msg.N_bits/8;
uint8_t *ptr = bit_msg.msg;
for (int i=0;i<nbytes;i++) {
ue_cri_ptr[nbytes-i-1] = (uint8_t) srslte_bit_unpack(&ptr, 8);
}
mac.set_param(srslte::ue::mac_params::CONTENTION_ID, uecri);
// Send ConnectionRequest Packet
printf("Send ConnectionRequest %d bytes\n", nbytes);
mac.send_ccch_sdu(bit_msg.msg, bit_msg.N_bits);
state = CONNECT;
} else {
tti = mac.get_tti();
mac.set_param(srslte::ue::mac_params::BCCH_SI_WINDOW_ST, sib_start_tti(tti, sib2_period, 0));
mac.set_param(srslte::ue::mac_params::BCCH_SI_WINDOW_LEN, si_window_len);
}
break;
case CONNECT:
// Wait for Connection Setup
n = mac.recv_ccch_sdu(bit_msg.msg, LIBLTE_MAX_MSG_SIZE);
if (n > 0) {
printf("ConnSetup received %d bytes\n", n/8);
bit_msg.N_bits = n;
srslte_vec_fprint_hex(stdout, bit_msg.msg, n);
liblte_rrc_unpack_dl_ccch_msg(&bit_msg, &dl_ccch_msg);
printf("Response: %s\n", liblte_rrc_dl_ccch_msg_type_text[dl_ccch_msg.msg_type]);
switch (dl_ccch_msg.msg_type) {
case LIBLTE_RRC_DL_CCCH_MSG_TYPE_RRC_CON_SETUP:
// Process ConnectionSetup
process_connsetup(&dl_ccch_msg.msg.rrc_con_setup, &mac, &phy);
// Generate and send ConnectionSetupComplete
for (int i=0;i<2;i++) {
printf("Sending Connection Setup Complete %d\n", i);
srslte_bit_pack_vector(setupComplete_segm[i], bit_msg.msg, lengths[i]*8);
n=mac.send_dcch0_sdu(bit_msg.msg, lengths[i]*8);
if (n < 0) {
fprintf(stderr, "Error writting to DCCH0\n");
exit(-1);
}
}
state = SETUPCOMPLETE;
break;
case LIBLTE_RRC_DL_CCCH_MSG_TYPE_RRC_CON_REJ:
mac.set_param(srslte::ue::mac_params::RNTI_C, 0);
break;
}
// exit(0);
}
break;
case SETUPCOMPLETE:
// Wait for ConnectionSetup
n = mac.recv_dcch0_sdu(bit_msg.msg, LIBLTE_MAX_MSG_SIZE);
if (n > 0) {
printf("Received on DCCH0 %d bytes\n", n/8);
printf("Send RLC ACK\n");
srslte_bit_pack_vector(reply, bit_msg.msg, 2*8);
n=mac.send_dcch0_sdu(bit_msg.msg, 2*8);
if (n < 0) {
fprintf(stderr, "Error writting to DCCH0\n");
exit(-1);
}
state = IDLE;
}
break;
case IDLE:
break;
}
usleep(10000);
}
}
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