Reboot via SMS (4G modem)

Installing and Using OpenWrt
1

I Have a LEDE installed on Pi3 with 4G Internet dongle connected. Now want to be able to send sms to 4G modem with a command to reboot LEDE.

Anyone done something similar?

2

Yes, I installed once smstools3 and gammu while I was playing with a 3G Modem some time ago, with 4G should be the same as far it is have working module with that feature, I don't remember which one I used but I was able to receive and launch a shell script once sms was received.

Please if you manage to do it post here the steps, It should be easy but would be really useful to have it here.

3

You can do it with own gcom scripts. But be carefully.

# set wwan mode from environment
opengt
set com 115200n81
set senddelay 0.02
waitquiet 1 0.2
flash 0.1

:start
 send "at+cmgf=1^m"
waitfor 1 "OK"
send "AT+CMGL=\"ALL\"^m"
:getl
get 10 "^m" $l
if % = -1 goto endl
print $l
 if (len($l)) < 2 goto getl
 if $right($l,2) = "OK" goto endl
 goto getl

:endl
exit 0

and then I have shell script started from cron

DEVICE="/dev/ttyUSB2"
SCRIPT="/etc/gcom/readsms.gcom"

SMS=`comgt -d $DEVICE -s $SCRIPT`
if [[ $SMS == *"CMGL:"* ]] ; then #is there new SMS?
  ...read sms and do what you want. Be sure, sms is sent from your number (check it here) to avoid unexpected reboots
  fi
fi