ubuntu 14.04
smsd 3.1.15
from package repository
Factory GSM MODEM Wavecom 4 port Modem pool GSM modem Q2303 USSD STK Mobile recharge By Antecheng
USB

hello every one,

ttyUSB are suddenly disappears when the SMSD modem handler are trying to comunicate to the modem,

when i tried to communicate to the modem using smsd -C sim1 or any of the four devices, the ttyUSB are gone after this output on the terminal

Opening device /dev/ttyUSB0
Ready.

thanks for help.

and here's my smsd.conf
# Example smsd.conf. Read the manual for a description

devices=sim1,sim2,sim3,sim4
incoming = /var/spool/sms/incoming
outgoing = /var/spool/sms/outgoing
checked = /var/spool/sms/checked
failed = /var/spool/sms/failed
sent = /var/spool/sms/sent

errorsleeptime=1
max_continuous_sending = 150000
blockafter = 1
logtime_ms=yes

loglevel = 7
trust_outgoing =yes

receive_before_send = no

[queues]
sim1 = /var/spool/sms/GSM1
sim2 = /var/spool/sms/GSM2
sim3 = /var/spool/sms/GSM3
sim4 = /var/spool/sms/GSM4

[providers]
#-----------------------------------------------
# PREFIX REFERENCE
# ALL GLOBE: 63817, 63905, 63906, 63915, 63916, 63917, 63926, 63927, 63935, 63936,
# 63937, 63975, 63994, 63996, 63997
# ALL SMART: 63813, 63907, 63908, 63909, 63910, 63912, 63918, 63919, 63920, 63921,
# 63928, 63929, 63930, 63938, 63939, 63946, 63947, 63948, 63949, 63989,
# 63998, 63999
# ALL SUN: 63922, 63923, 63925, 63932, 63933, 63934, 63942, 63943
#-----------------------------------------------

sim1 = 63001
sim2 = 63002
sim3 = 63003
sim4 = 63977, 63905, 63936, 63817, 63906, 63915, 63916, 63917, 63912, 63922, 63923, 63925, 63926, 63927, 63942, 63943, 63934, 63813, 63907, 63908, 63946, 63937, 63975, 63994, 63996, 63997, 63935, 63932, 63933, 63910, 63928, 63929, 63930, 63938, 63939, 63909, 63949, 63989, 63918, 63919, 63920, 63921, 63948, 63998, 63999, 63947, s

###################################
[sim1]
queues = sim1
init = ATE0+CPMS="SM"+CNMI=2,0,0,2,1
pre_init=0
pin=ignore
status_signal_quality=no
outgoing=yes
detect_unexpected_input=no
trust_spool=no
check_memory_method=41
communication_delay=300
cs_convert=yes
detect_message_routing = no
rtscts = no
device = /dev/ttyUSB0
incoming = yes
report_device_details = no
check_network = 0
signal_quality_ber_ignore = yes
baudrate=115200
sending_disabled = no
read_timeout = 60
init2 = AT+CSQ

[sim2]
queues = sim2
init = ATE0+CPMS="SM"+CNMI=2,0,0,2,1
pre_init=0
pin=ignore
status_signal_quality=no
outgoing=yes
detect_unexpected_input=no
trust_spool=no
check_memory_method=41
communication_delay=300
cs_convert=yes
detect_message_routing = no
rtscts = no
device = /dev/ttyUSB1
incoming = yes
report_device_details = no
check_network = 0
signal_quality_ber_ignore = yes
baudrate=115200
sending_disabled = no
read_timeout = 60
init2 = AT+CSQ

[sim3]
queues = sim3
init = ATE0+CPMS="SM"+CNMI=2,0,0,2,1
pre_init=0
pin=ignore
status_signal_quality=no
outgoing=yes
detect_unexpected_input=no
trust_spool=no
check_memory_method=41
communication_delay=300
cs_convert=yes
detect_message_routing = no
rtscts = no
device = /dev/ttyUSB2
incoming = yes
report_device_details = no
check_network = 0
signal_quality_ber_ignore = yes
baudrate=115200
sending_disabled = no
read_timeout = 60
init2 = AT+CSQ

[sim4]
queues = sim4
init = ATE0+CPMS="SM"+CNMI=2,0,0,2,1
pre_init=0
pin=ignore
status_signal_quality=no
outgoing=yes
detect_unexpected_input=no
trust_spool=no
check_memory_method=41
communication_delay=300
cs_convert=yes
detect_message_routing = no
rtscts = no
device = /dev/ttyUSB3
incoming = yes
report_device_details = no
check_network = 0
signal_quality_ber_ignore = yes
baudrate=115200
sending_disabled = no
read_timeout = 60
init2 = AT+CSQ