#!/bin/sh

# visibleSMSwatchdog.sh [optional initial delay in seconds]


# v 0.2 
# based on auto_check_SMS_Visible.sh provided by GL support
# if IMS status is good do nothing and recheck later
# if IMS status is bad then toggle the modem and recheck later


# FOR REFERENCE ONLY  
# I am clueless and you definitely should not run this clunky script
# I hope it gives better scripters some ideas

### pull in some shell functions already present on router
. /lib/functions/modem.sh

### defines

# log
LOG=/root/modemReset.log

# from modem.sh
BUS=$(get_modem_bus)

# where to ping to assure connectivity
PINGTARGET=8.8.8.8

# how often to run the loop (in seconds).  
CHECK_INTERVAL=600


### functions
resetModem() {

	echo $(uptime) RESETTING MODEM | tee -a $LOG

	# off
	gl_modem -B $BUS AT AT+CFUN=0 | tee -a $LOG
	sleep 10
	# back on
	gl_modem -B $BUS AT AT+CFUN=1 | tee -a  $LOG
}

#############################################################
### action starts here ######################################
#############################################################

# sleep N seconds if passed on command line
# could be useful for calling at boot time
if [ -n "$1" ]
then 
        echo waiting $1 seconds for first run -- $(UPTIME) | tee -a $LOG
	sleep $1
fi


while true
do

	# ensure we are online, then proceed
	until ping -c 1 $PINGTARGET; do sleep 30; done

	# check IMS status
	# WORKING:      +QIMSCFG: "ims_status",0,0,2,2,0,0
	# NOT working:  +QIMSCFG: "ims_status",0,0,0,0,0,0 

	echo $(date) checking IMS... | tee -a $LOG
	IMSSTATUS=$(gl_modem -B 0001:01:00.0 SAT sp AT+QIMSCFG=\"ims_status\" | awk -F , '{print $5}')

	if [[ $IMSSTATUS -ne 2 ]] 
	then

		echo "$(uptime) IMS failed" | tee -a  $LOG		
	
		# fix it  
  		resetModem

	fi

	# and sleep until the next check
	sleep $CHECK_INTERVAL

done