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@@ -1,8 +1,9 @@
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#!/bin/sh
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# SIM slot switcher for HuastLink HC-G60 or ZBT-WE2806-A
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# or similiar cpe OpenWrt-routers
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# or similar CPE OpenWrt-routers
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# by Konstantine Shevlakov at <shevlakov@132lan.ru> 2025
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# Audited & fixed 2026
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NODE="SW SIM"
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@@ -34,38 +35,58 @@ NODE="SW SIM"
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# option value '1'
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# Get Variables
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. /lib/functions.sh
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# Callback failover section
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_load_failover(){
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config_get enable "$1" enable ""
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config_get interval "$1" interval 60
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config_get revert "$1" revert ""
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config_get rsrp "$1" rsrp ""
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config_get times_rsrp "$1" times_rsrp 5
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config_get apn1 "$1" apn1 ""
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config_get apn2 "$1" apn2 ""
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}
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# Callback sections modem / sim (gpio type)
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_load_gpio(){
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local _gpio _value
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config_get _gpio "$1" gpio ""
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config_get _value "$1" value ""
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eval "${1}_gpio=\"$_gpio\""
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eval "${1}_value=\"$_value\""
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}
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# Get Variables — update for every cycle
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get_vars(){
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for v in enable interval revert rsrp times_rsrp apn1 apn2; do
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eval $v=$(uci -q get ssw.failover.${v} 2>/dev/nul)
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done
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for d in modem sim; do
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for s in gpio value; do
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eval "${d}_${s}=$(uci -q get ssw.${d}.${s} 2>/dev/null)"
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done
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done
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[ -n "$interval" ] || interval=60
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[ -n "$times_rsrp" ] || times_rsrp=5
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reset_cb
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config_load ssw
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config_foreach _load_failover failover
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config_foreach _load_gpio modem
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config_foreach _load_gpio sim
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}
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# SIM Switch
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sw_sim(){
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case $cur_sim in
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case "$cur_sim" in
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0) next_sim=1 ;;
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1) next_sim=0 ;;
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*)
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logger -t "$NODE" "ERROR: cur_sim has unexpected value '$cur_sim'. Aborting sw_sim."
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return 1
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;;
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esac
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echo "0" > /sys/class/gpio/$modem_gpio/value
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echo "$next_sim" > /sys/class/gpio/$sim_gpio/value
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echo "0" > /sys/class/gpio/"$modem_gpio"/value
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echo "$next_sim" > /sys/class/gpio/"$sim_gpio"/value
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if [ "$modem_value" = "1" ]; then
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sleep 2
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echo "1" > /sys/class/gpio/$modem_gpio/value
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echo "1" > /sys/class/gpio/"$modem_gpio"/value
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if [ -x /etc/init.d/smstools3 ]; then
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/etc/init.d/smstools3 restart
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fi
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fi
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set > /tmp/apn.ssw
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}
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# Revert rule switch
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@@ -84,32 +105,59 @@ sw_rule(){
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# Check interface state via mwan3
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monitor_mwan3(){
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iface=$(uci show network | awk -F [.] '/devices/{print $2}')
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iface=$(uci show network | awk -F'[.]' '/devices/{print $2}' | tail -1)
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# Check link status
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if [ -r /tmp/run/mwan3/iface_state/$iface ]; then
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link_status=$(cat /tmp/run/mwan3/iface_state/$iface | grep online | wc -l)
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if [ -r "/tmp/run/mwan3/iface_state/$iface" ]; then
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link_status=$(grep -c online "/tmp/run/mwan3/iface_state/$iface" || echo 0)
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else
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# Disable track link via mwan3
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link_status=1
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fi
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}
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# RSRP average value by modemmanager. Enable singnal monitor!
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check_signal(){
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local gen="$1" signal_json="$2"
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local metric value
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case "$gen" in
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lte|5g) metric="rsrp" ;;
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3g) metric="rscp" ;;
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*)
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logger -t "$NODE" "check_signal: unknown generation '$gen'"
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return 1
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;;
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esac
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value=$(echo "$signal_json" \
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| jsonfilter -e "@[\"modem\"][*][\"${gen}\"][\"${metric}\"]" 2>/dev/null \
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| awk '{printf "%.0f\n", $1}')
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[ -n "$value" ] && echo "$value"
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}
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# RSRP/RSCP average value by modemmanager. Enable signal monitor!
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monitor_rsrp(){
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device="$(uci show network | awk -F [=] '/devices/{gsub("'\''","");print $2}')"
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SIGNAL="$(mmcli -J -m $device --signal-get)"
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CRSRP=$(echo "$SIGNAL" | jsonfilter -e '@["modem"][*]["lte"]["rsrp"]' | awk '{printf "%.0f\n", $1}')
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if ! [ $CRSRP ]; then
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CRSRP=$(echo "$SIGNAL" | jsonfilter -e '@["modem"][*]["5g"]["rsrp"]' | awk '{printf "%.0f\n", $1}')
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local device SIGNAL CRSRP
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device="$(uci show network | awk -F'[=]' '/devices/{gsub("'\''",""); print $2}' | tail -1)"
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SIGNAL="$(mmcli -J -m "$device" --signal-get 2>/dev/null)"
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for gen in lte 5g 3g; do
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CRSRP=$(check_signal "$gen" "$SIGNAL")
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[ -n "$CRSRP" ] && break
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done
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if [ -n "$CRSRP" ] && [ "$CRSRP" -ne 0 ]; then
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echo "$CRSRP" >> /tmp/ssw_rsrp.var
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fi
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if [ $CRSRP -ne 0 ]; then
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echo $CRSRP >> /tmp/ssw_rsrp.var
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fi
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if [ $cnt -eq $times_rsrp ]; then
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RSRP=$(awk '{sum+=$1} END { printf "%.0f\n", sum/NR }' /tmp/ssw_rsrp.var)
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cat /dev/null > /tmp/ssw_rsrp.var
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if [ $RSRP -lt $rsrp ]; then
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if [ "$cnt" -eq "$times_rsrp" ]; then
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if [ -s /tmp/ssw_rsrp.var ]; then
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RSRP=$(awk '{sum+=$1} END { printf "%.0f\n", sum/NR }' /tmp/ssw_rsrp.var)
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fi
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: > /tmp/ssw_rsrp.var
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if [ -n "$RSRP" ] && [ "$RSRP" -lt "$rsrp" ]; then
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mon_rsrp=0
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else
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mon_rsrp=1
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@@ -121,68 +169,74 @@ monitor_rsrp(){
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reload_iface(){
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[ "$iface" ] && {
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for i in $iface; do
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ifup $i
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ifup "$i"
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done
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}
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}
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# Stuff
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cnt=1
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cnt=0
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while true; do
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get_vars
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sleep $interval
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sleep "$interval"
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if [ "$enable" = "1" ]; then
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cur_sim=$(cat /sys/class/gpio/$sim_gpio/value)
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cur_sim=$(cat /sys/class/gpio/"$sim_gpio"/value)
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cnt=$(( cnt + 1 ))
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monitor_rsrp
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monitor_mwan3
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if [ "$cnt" -eq "$times_rsrp" ]; then
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if [ "$link_status" = "0" -o "$mon_rsrp" = "0" ]; then
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if [ "$link_status" = "0" ] || [ "$mon_rsrp" = "0" ]; then
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if [ "$sim_value" -eq "$cur_sim" ]; then
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apn=$apn2
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else
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apn=$apn1
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fi
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iface=$(uci show network | awk -F [.] '/devices/{gsub("'\''","");print $2}' | tail -1)
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if [ $RSRP ]; then
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iface=$(uci show network | awk -F'[.]' '/devices/{gsub("'\''",""); print $2}' | tail -1)
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if [ -n "$RSRP" ]; then
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if [ "$mon_rsrp" = "0" ]; then
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logger -t "$NODE" "Modem interface: $iface is average RSRP= ${RSRP} dBm. Min. value ${rsrp} dBm."
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logger -t "$NODE" "Modem interface: $iface average RSRP=${RSRP} dBm. Min. value ${rsrp} dBm."
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fi
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if [ "$link_status" = "0" ]; then
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logger -t "$NODE" "Modem interface: $iface is loss connectivity"
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logger -t "$NODE" "Modem interface: $iface lost connectivity."
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fi
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else
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logger -t "$NODE" "WARNING: RSRP value not exist. Please check \"Resfesh signal\" option of modem interface!"
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logger -t "$NODE" "WARNING: RSRP value not available. Check 'Refresh signal' option of modem interface!"
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fi
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if [ "${#apn}" -gt "0" ]; then
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uci set network.$iface.apn="$apn"
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if [ "${#apn}" -gt 0 ]; then
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uci set network."$iface".apn="$apn"
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logger -t "$NODE" "Switch SIM-card slot with APN: $apn"
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else
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logger -t "$NODE" "WARNING: APN not defined. Switch SIM-card slot with default APN."
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uci set network.$iface.apn="internet"
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logger -t "$NODE" "WARNING: APN not defined. Switching SIM-card slot with default APN."
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uci set network."$iface".apn="internet"
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fi
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uci commit network
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reload_config network
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reload_config
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if [ "$revert" = "1" ]; then
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if [ "$cur_sim" -eq "$sim_value" ]; then
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FBT=${FBT:=$((($interval+$times_rsrp)*2))}
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FBT=$(($FBT*2))
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SWDATE=$((`date +%s`+$FBT))
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echo "FBT=$FBT" > /tmp/ssw.vars
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echo SWDATE=$SWDATE >> /tmp/ssw.vars
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logger -t "$NODE" "Back to default SIM-slot after $(date -d @${SWDATE})"
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if [ "$cur_sim" -eq "$sim_value" ]; then
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FBT=${FBT:=$(( (interval + times_rsrp) * 2 ))}
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FBT=$(( FBT * 2 ))
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SWDATE=$(( $(date +%s) + FBT ))
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printf 'FBT=%s\nSWDATE=%s\n' "$FBT" "$SWDATE" > /tmp/ssw.vars
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logger -t "$NODE" "Back to default SIM-slot after $(date -d @"${SWDATE}")"
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fi
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fi
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sw_sim && sleep 20 && reload_iface &
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fi
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if [ "$revert" = "1" ]; then
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elif [ "$revert" = "1" ]; then
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sw_rule && sleep 20 && reload_iface &
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fi
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cnt=0
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else
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cnt=$(($cnt+1))
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cnt=1
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fi
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fi
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done
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done
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