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|
#!/bin/sh
VERBOSE=no
PIDS=`pidof -x "$0"`
# make sure pidof sees us
if [ -z "$PIDS" ]; then
exec "$0"
exit 1
fi
GSM_DEVICE="/dev/ttySAC0"
GSM_POWER="/sys/devices/platform/neo1973-pm-gsm.0/power_on"
GSM_RESET="/sys/devices/platform/neo1973-pm-gsm.0/reset"
GSM_COMMANDS="Z E0V1 +CFUN=1 +COPS=0"
gsm_running () {
if [ "$PIDS" != "$$" ]; then
return 0
else
return 1
fi
}
gsm_send () {
cmd="$1"
echo -ne "AT${cmd}\r" > "$GSM_DEVICE"
}
# this function might block forever
gsm_wait () {
ret="UNKNOWN"
while read status; do
case "$status" in
OK*)
ret="OK"
;;
ERROR*)
ret="ERROR"
;;
*)
ret="UNKNOWN"
;;
esac
if [ "x$ret" != "xUNKNOWN" ]; then
break
fi
done < "$GSM_DEVICE"
if [ "x$ret" != "xOK" ]; then
return 1
fi
return 0
}
gsm_setup () {
[ $VERBOSE == "yes" ] && echo -n "Powering up GSM modem..."
echo 0 > "$GSM_POWER"; sleep 1
echo 1 > "$GSM_POWER"; sleep 1
echo 1 > "$GSM_RESET"; sleep 1
echo 0 > "$GSM_RESET"; sleep 4
[ $VERBOSE == "yes" ] && echo "done"
stty -F "$GSM_DEVICE" cooked -opost -echo crtscts 115200
}
gsm_wakeup () {
[ $VERBOSE == "yes" ] && echo "Waking up GSM modem"
# there is at most one OK/ERROR even if we send multiple commands
gsm_send ""
gsm_send ""
gsm_send ""
if gsm_wait; then
[ $VERBOSE == "yes" ] && echo "GSM modem awake"
return 0
else
echo "failed to wake up GSM modem"
return 1
fi
}
start () {
gsm_setup
if gsm_wakeup; then
for cmd in $GSM_COMMANDS
do
[ $VERBOSE == "yes" ] && echo "Sending AT$cmd"
gsm_send "$cmd"
if ! gsm_wait; then
echo "AT$cmd failed"
break
fi
done
fi
}
set -e
case "$1" in
start)
if gsm_running; then
echo "Another instance is already running"
exit 1
fi
start &
;;
stop)
if gsm_running; then
PIDS=`pidof -x -o "$$" "$0"`
echo -n "Stopping other instances..."
kill $PIDS
echo "done"
fi
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
;;
esac
|
