Hello,
it happens to me, that the /dev/ttyUSBx is not available or dying for whatever reason, but then the smstools as still running is writing to /dev/ttyUSB02, but is not existing to it is creating a file with:
AT-cmd inside. ...

normally i have devices:
/dev/ttyUSB0
/dev/ttyUSB1
/dev/ttyUSB2
/dev/ttyUSB3

and creating a link /dev/modem_sms to /dev/ttyUSB2

so, that works great 8as ttyUSB0 is used for 3G modem connection and ttyUSB3 using to get signal strenght


now i happens that the /dev/ttyUSB2 is not available for whatever reason, and smstools3 is sending a AT cmd to this non existing device, which creates a new file and write into: AT.....

on the other side, i have a smsalarm handler, which regonize that there is a device issue, and this will then restart the whole network to get all /dev/ttyUSB back.
BUt as /dev/ttyUSB2 now existing as file, it will create:
/dev/ttyUSB0
/dev/ttyUSB1
/dev/ttyUSB3
/dev/ttyUSB4

then it is also via start script called: /etc/init.d/device_links i will find and recreate the links to the given new dev name.

but when that happens again, it wil on next round do the same, and then on network restart i have then:
/dev/ttyUSB0
/dev/ttyUSB1
/dev/ttyUSB4
/dev/ttyUSB5

and on enxt round again
/dev/ttyUSB0
/dev/ttyUSB1
/dev/ttyUSB5
/dev/ttyUSB6
and so on ...
that is because smstools is not checking if device is existing.

so, my question: can you add to check if device is existing and only if it existis, then send cmd to sms modem.

or is there an option, to tell smstools to verify if device exists (before sending cmd to it) ?

is like:

if [ ! -e /dev/ttyUSB2 ] && [ ! -f /dev/ttyUSB2 ] ; then .... #device seems to be existing and is not a file

cu Camel

also showing my script to set the links to modem for info, sms, and modem


/etc/init.d/device_links
#!/bin/sh /etc/rc.common START=17 STOP=90 DEVICE_modem="/dev/modem" DEVICE_modem_info="/dev/modem_info" DEVICE_modem_sms="/dev/modem_sms" #logger -t DeviceLinks "Parameters 1=$1, 2=$2, 3=$3, 4=$4, 5=$5, 6=$6" reload() { stop start } restart() { stop start } boot() { start } start() { if [ ! -e "$DEVICE_modem" ]; then logger -t DeviceLinks "Device Start: *MODEM* $DEVICE_modem does not exist" local try=0 local max=3 while [ $((++try)) -le $max ]; do rm -f $DEVICE_modem 2> /dev/null || true # Create link to lowest modem id if [ -e /dev/ttyUSB0 ]; then ln -sf /dev/ttyUSB0 "$DEVICE_modem" elif [ -e /dev/ttyUSB1 ]; then ln -sf /dev/ttyUSB1 "$DEVICE_modem" else logger -t DeviceLinks "Device Start: *MODEM* $DEVICE_modem still not set as no valid modem device found in system" sleep 3 fi done logger -t DeviceLinks "Device Start: *MODEM* $DEVICE_modem now set to: $(readlink "$DEVICE_modem")" else logger -t DeviceLinks "Device Start: *MODEM* $DEVICE_modem already existing as: $(readlink "$DEVICE_modem")" fi if [ ! -e "$DEVICE_modem_info" ]; then logger -t DeviceLinks "Device Start: *MODEM_INFO* $DEVICE_modem_info does not exist" local try=0 local max=3 while [ $((++try)) -le $max ]; do rm -f $DEVICE_modem_info 2> /dev/null || true # Create link to higest modem id if [ -e /dev/ttyUSB6 ]; then ln -sf /dev/ttyUSB6 "$DEVICE_modem_info" elif [ -e /dev/ttyUSB5 ]; then ln -sf /dev/ttyUSB5 "$DEVICE_modem_info" elif [ -e /dev/ttyUSB4 ]; then ln -sf /dev/ttyUSB4 "$DEVICE_modem_info" elif [ -e /dev/ttyUSB3 ]; then ln -sf /dev/ttyUSB3 "$DEVICE_modem_info" else logger -t DeviceLinks "Device Start: *MODEM_INFO* $DEVICE_modem_info still not set as no valid modem_info device found in system" sleep 3 fi done logger -t DeviceLinks "Device Start: *MODEM_INFO* $DEVICE_modem_info now set to: $(readlink "$DEVICE_modem_info")" else logger -t DeviceLinks "Device Start: *MODEM_INFO* $DEVICE_modem_info already existing as: $(readlink "$DEVICE_modem_info")" fi if [ ! -e "$DEVICE_modem_sms" ]; then logger -t DeviceLinks "Device Start: *MODEM_SMS* $DEVICE_modem_sms does not exist" local try=0 local max=3 while [ $((++try)) -le $max ]; do rm -f $DEVICE_modem_sms 2> /dev/null || true # Create link to med modem id if [ -e /dev/ttyUSB2 ]; then ln -sf /dev/ttyUSB2 "$DEVICE_modem_sms" elif [ -e /dev/ttyUSB3 ]; then ln -sf /dev/ttyUSB3 "$DEVICE_modem_sms" elif [ -e /dev/ttyUSB4 ]; then ln -sf /dev/ttyUSB4 "$DEVICE_modem_sms" elif [ -e /dev/ttyUSB5 ]; then ln -sf /dev/ttyUSB5 "$DEVICE_modem_sms" elif [ -e /dev/ttyUSB6 ]; then ln -sf /dev/ttyUSB6 "$DEVICE_modem_sms" else logger -t DeviceLinks "Device Start: *MODEM_SMS* $DEVICE_modem_sms still not set as no valid modem_sms device found in system" sleep 3 fi done logger -t DeviceLinks "Device Start: *MODEM_SMS* $DEVICE_modem_sms now set to: $(readlink "$DEVICE_modem_sms")" else logger -t DeviceLinks "Device Start: *MODEM_SMS* $DEVICE_modem_sms already existing as: $(readlink "$DEVICE_modem_sms")" fi } stop() { rm -f $DEVICE_modem 2>/dev/null || true logger -t DeviceLinks "Device Stop: *MODEM* $DEVICE_modem removed from system" rm -f $DEVICE_modem_info 2> /dev/null || true logger -t DeviceLinks "Device Stop: *MODEM_INFO* $DEVICE_modem_info removed from system" rm -f $DEVICE_modem_sms 2> /dev/null || true logger -t DeviceLinks "Device Stop: *MODEM_SMS* $DEVICE_modem_sms removed from system" if [ -f /dev/ttyUSB1 ]; then logger -t DeviceLinks "Device */dev/ttyUSB1* is a file - not a device type. Need to delete it" echo "Device */dev/ttyUSB1* is a file - not a device type. Need to delete it" rm -f /dev/ttyUSB1 fi if [ -f /dev/ttyUSB2 ]; then logger -t DeviceLinks "Device */dev/ttyUSB2* is a file - not a device type. Need to delete it" echo "Device */dev/ttyUSB2* is a file - not a device type. Need to delete it" rm -f /dev/ttyUSB2 fi if [ -f /dev/ttyUSB3 ]; then logger -t DeviceLinks "Device */dev/ttyUSB3* is a file - not a device type. Need to delete it" echo "Device */dev/ttyUSB3* is a file - not a device type. Need to delete it" rm -f /dev/ttyUSB3 fi if [ -f /dev/ttyUSB4 ]; then logger -t DeviceLinks "Device */dev/ttyUSB4* is a file - not a device type. Need to delete it" echo "Device */dev/ttyUSB4* is a file - not a device type. Need to delete it" rm -f /dev/ttyUSB4 fi if [ -f /dev/ttyUSB5 ]; then logger -t DeviceLinks "Device */dev/ttyUSB5* is a file - not a device type. Need to delete it" echo "Device */dev/ttyUSB5* is a file - not a device type. Need to delete it" rm -f /dev/ttyUSB5 fi if [ -f /dev/ttyUSB6 ]; then logger -t DeviceLinks "Device */dev/ttyUSB6* is a file - not a device type. Need to delete it" echo "Device */dev/ttyUSB6* is a file - not a device type. Need to delete it" rm -f /dev/ttyUSB5 fi }