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#!/bin/sh
 
usage() {
    echo >&2 "usage: $0 [-c ping_count] [-i reconnection_interval(second)] ping_destination"
    exit 1
}
 
reset() {
    logger -s -t 3g-checker 'reset'
 
    echo 1 > /sys/class/gpio/RESET_N_3G/value
    while [ -e /dev/ttyATCMD ]
    do
        sleep 1
    done
 
    usleep 40000
    echo 0 > /sys/class/gpio/RESET_N_3G/value
    while [ ! -e /dev/ttyATCMD ]
    do
        sleep 1
    done
 
    sleep 30
}
 
ping_count=5
recon_int=600
while getopts c:i: OPT
do
    case $OPT in
    'c')
        ping_count=$OPTARG
        shift 2
        ;;
    'i')
        recon_int=$OPTARG
        shift 2
        ;;
    esac
done
 
[ $# -eq 1 ] || usage
ping_dest=$1
 
while :
do
    if ! 3g-phone-num > /dev/null 2>&1
    then
        logger -s -t 3g-checker 'SIM card not detected'
        sleep ${recon_int}
        continue
    fi
 
    ping -c ${ping_count} ${ping_dest}
 
    if [ $? -ne 0 ]
    then
        logger -s -t 3g-checker 'disconnected'
        reset
        ifdown umts0
        # 3g-set-ap [apn] [user] [password] [auth_type] [pdp_type]
        ifup umts0
    else
        logger -s -t 3g-checker 'connected'
        sleep ${recon_int}
    fi
done