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@@ -9,3 +9,11 @@ config sim 'sim'
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config failover 'failover'
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config schedule 'schedule'
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option enable '0'
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option period 'daily'
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option period_days '3'
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option weekday '1'
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option time_on '02:00'
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option duration '120'
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option apn ''
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+234
-119
@@ -1,11 +1,8 @@
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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 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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# or similiar cpe OpenWrt-routers
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# by Konstantine Shevlakov at <shevlakov@132lan.ru> 2025-2026
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# config file stored in /etc/config/ssw
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# define gpios in /etc/config/system
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@@ -34,67 +31,72 @@ NODE="SW SIM"
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# option gpio 'sim'
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# option value '1'
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# Schedule switch section example /etc/config/ssw:
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#
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# config schedule 'schedule'
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# option enable '1'
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# option time_on 'HH:MM' # time to switch to reserve SIM (24h format)
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# option duration '60' # minutes until revert to default SIM (0 = no revert)
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# option apn 'internet' # APN for reserve SIM during schedule switch
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# option period 'daily' # daily | interval | weekly
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# option period_days '3' # for period=interval: every N days
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# option weekday '1' # for period=weekly: 0=Sun 1=Mon … 6=Sat
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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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NODE="SW SIM"
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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 Variables
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get_vars(){
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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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for v in enable interval revert rsrp times_rsrp apn1 apn2; do
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eval $v=$(uci -q get ssw.failover.${v} 2>/dev/null)
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done
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for d in modem sim; do
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for s in gpio value; do
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eval "${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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# Schedule variables
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sched_enable=$(uci -q get ssw.schedule.enable 2>/dev/null)
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sched_time_on=$(uci -q get ssw.schedule.time_on 2>/dev/null)
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sched_duration=$(uci -q get ssw.schedule.duration 2>/dev/null)
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sched_apn=$(uci -q get ssw.schedule.apn 2>/dev/null)
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sched_period=$(uci -q get ssw.schedule.period 2>/dev/null)
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sched_period_days=$(uci -q get ssw.schedule.period_days 2>/dev/null)
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sched_weekday=$(uci -q get ssw.schedule.weekday 2>/dev/null)
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[ -n "$sched_duration" ] || sched_duration=0
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[ -n "$sched_period" ] || sched_period=daily
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[ -n "$sched_period_days" ] || sched_period_days=1
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[ -n "$sched_weekday" ] || sched_weekday=1
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}
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# SIM Switch
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sw_sim(){
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case "$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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# Revert rule switch (failover)
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sw_rule(){
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if [ -f /tmp/ssw.vars ]; then
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. /tmp/ssw.vars
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fi
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# Revert SIM card to default slot
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if [ "$cur_sim" -ne "$sim_value" ]; then
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if [ "$(date +%s)" -gt "$SWDATE" ]; then
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logger -t "$NODE" "Revert to default SIM slot with $apn"
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@@ -103,61 +105,176 @@ sw_rule(){
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fi
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}
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# Schedule: revert to default SIM after duration
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sched_revert(){
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[ -f /tmp/ssw_sched.vars ] && . /tmp/ssw_sched.vars
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if [ -n "$SCHED_REVERT_AT" ] && [ "$(date +%s)" -ge "$SCHED_REVERT_AT" ]; then
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cur_sim=$(cat /sys/class/gpio/$sim_gpio/value)
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if [ "$cur_sim" -ne "$sim_value" ]; then
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logger -t "$NODE" "Schedule: reverting to default SIM slot"
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iface=$(uci show network | awk -F [.] '/devices/{gsub("'\''","");print $2}' | tail -1)
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uci set network.$iface.apn="${apn1:-internet}"
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uci commit network
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reload_config network
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sw_sim && sleep 20 && reload_iface &
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fi
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rm -f /tmp/ssw_sched.vars
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logger -t "$NODE" "Schedule: revert done, schedule state cleared"
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fi
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}
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# Check if today matches the configured schedule period.
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# Returns 0 (true) if the switch should fire today, 1 otherwise.
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sched_day_match(){
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today=$(date +%Y%m%d)
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now_dow=$(date +%w) # 0=Sun .. 6=Sat
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case "$sched_period" in
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daily)
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return 0
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;;
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weekly)
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[ "$now_dow" = "$sched_weekday" ] && return 0
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return 1
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;;
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interval)
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# Read the date of the last successful switch from persistent state.
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# We keep it in /tmp/ssw_sched_last.date so it survives across
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# the daemon's iterations but resets on reboot (intentional —
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# after reboot the interval counter restarts from today).
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last_date=""
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[ -f /tmp/ssw_sched_last.date ] && last_date=$(cat /tmp/ssw_sched_last.date)
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if [ -z "$last_date" ]; then
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# First run ever (or after reboot): trigger today.
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return 0
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fi
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# Calculate elapsed days between last_date and today (YYYYMMDD arithmetic).
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# Use date to convert both to unix timestamps then divide.
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ts_last=$(date -d "$last_date" +%s 2>/dev/null)
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[ -z "$ts_last" ] && ts_last=$(date -jf "%Y%m%d" "$last_date" +%s 2>/dev/null)
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ts_now=$(date +%s)
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elapsed_days=$(( (ts_now - ts_last) / 86400 ))
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[ "$elapsed_days" -ge "$sched_period_days" ] && return 0
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return 1
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;;
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*)
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# Unknown period — treat as daily
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return 0
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;;
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esac
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}
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# Schedule: switch to reserve SIM at configured time
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check_schedule(){
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[ "$sched_enable" = "1" ] || return
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[ -n "$sched_time_on" ] || return
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# Handle pending revert first — takes priority over new switch logic.
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if [ -f /tmp/ssw_sched.vars ]; then
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sched_revert
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return
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fi
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# Parse HH:MM (strip leading zeros to avoid octal)
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sched_h=$(echo "$sched_time_on" | cut -d: -f1 | sed 's/^0*//')
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sched_m=$(echo "$sched_time_on" | cut -d: -f2 | sed 's/^0*//')
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[ -z "$sched_h" ] && sched_h=0
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[ -z "$sched_m" ] && sched_m=0
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now_h=$(date +%H | sed 's/^0*//')
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now_m=$(date +%M | sed 's/^0*//')
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[ -z "$now_h" ] && now_h=0
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[ -z "$now_m" ] && now_m=0
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# Check time window: [sched_time .. sched_time + ceil(interval/60)) minutes
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now_total=$(( now_h * 60 + now_m ))
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sched_total=$(( sched_h * 60 + sched_m ))
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interval_min=$(( interval / 60 + 1 ))
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diff=$(( now_total - sched_total ))
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# Not in the time window yet
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if [ "$diff" -lt 0 ] || [ "$diff" -ge "$interval_min" ]; then
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return
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fi
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# Check if the period condition is met (daily / weekly / every N days)
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sched_day_match || return
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# Check if we already fired today (prevents re-triggering within the same window)
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today=$(date +%Y%m%d)
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if [ -f /tmp/ssw_sched_fired.date ]; then
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fired=$(cat /tmp/ssw_sched_fired.date)
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[ "$fired" = "$today" ] && return
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fi
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# All conditions met — switch to reserve SIM
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cur_sim=$(cat /sys/class/gpio/$sim_gpio/value)
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if [ "$cur_sim" -ne "$sim_value" ]; then
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# Already on reserve SIM (e.g. failover active), skip but record the day.
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logger -t "$NODE" "Schedule: already on reserve SIM, skipping switch"
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echo "$today" > /tmp/ssw_sched_fired.date
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return
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fi
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logger -t "$NODE" "Schedule: switching to reserve SIM (period=$sched_period, time=$sched_time_on)"
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iface=$(uci show network | awk -F [.] '/devices/{gsub("'\''","");print $2}' | tail -1)
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apn_use="${sched_apn:-${apn2:-internet}}"
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uci set network.$iface.apn="$apn_use"
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uci commit network
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reload_config network
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sw_sim && sleep 20 && reload_iface &
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# Record fire date (suppress re-trigger within same day/window)
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echo "$today" > /tmp/ssw_sched_fired.date
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# For interval mode: record as the last successful switch date
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if [ "$sched_period" = "interval" ]; then
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echo "$today" > /tmp/ssw_sched_last.date
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fi
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# Arm the revert timer if duration > 0
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if [ "$sched_duration" -gt 0 ]; then
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revert_at=$(( $(date +%s) + sched_duration * 60 ))
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echo "SCHED_REVERT_AT=$revert_at" > /tmp/ssw_sched.vars
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logger -t "$NODE" "Schedule: will revert to default SIM in ${sched_duration} min"
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else
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logger -t "$NODE" "Schedule: no auto-revert configured"
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fi
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}
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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 $2}' | tail -1)
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# Check link status
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if [ -r "/tmp/run/mwan3/iface_state/$iface" ]; then
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link_status=$(grep -c online "/tmp/run/mwan3/iface_state/$iface" || echo 0)
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iface=$(uci show network | awk -F [.] '/devices/{print $2}')
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if [ -r /tmp/run/mwan3/iface_state/$iface ]; then
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link_status=$(cat /tmp/run/mwan3/iface_state/$iface | grep online | wc -l)
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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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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 "$value"
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}
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# RSRP/RSCP average value by modemmanager. Enable signal monitor!
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# RSRP average value by modemmanager. Enable signal monitor!
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monitor_rsrp(){
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local device SIGNAL CRSRP
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device="$(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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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", $1}')
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fi
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if [ "$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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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 $rsrp ]; then
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mon_rsrp=0
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else
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mon_rsrp=1
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@@ -169,74 +286,72 @@ monitor_rsrp(){
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reload_iface(){
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[ "$iface" ] && {
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for i in $iface; do
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ifup "$i"
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ifup $i
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done
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}
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}
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cnt=0
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# Stuff
|
||||
cnt=1
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while true; do
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get_vars
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sleep "$interval"
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sleep $interval
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# Schedule check runs every iteration, independently of failover
|
||||
check_schedule
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if [ "$enable" = "1" ]; then
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cur_sim=$(cat /sys/class/gpio/"$sim_gpio"/value)
|
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|
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cnt=$(( cnt + 1 ))
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cur_sim=$(cat /sys/class/gpio/$sim_gpio/value)
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monitor_rsrp
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monitor_mwan3
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||||
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if [ "$cnt" -eq "$times_rsrp" ]; then
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if [ "$link_status" = "0" ] || [ "$mon_rsrp" = "0" ]; then
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if [ "$link_status" = "0" -o "$mon_rsrp" = "0" ]; then
|
||||
|
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if [ "$sim_value" -eq "$cur_sim" ]; then
|
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apn=$apn2
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else
|
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apn=$apn1
|
||||
fi
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||||
|
||||
iface=$(uci show network | awk -F'[.]' '/devices/{gsub("'\''",""); print $2}' | tail -1)
|
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|
||||
if [ -n "$RSRP" ]; then
|
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iface=$(uci show network | awk -F [.] '/devices/{gsub("'\''","");print $2}' | tail -1)
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if [ $RSRP ]; then
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if [ "$mon_rsrp" = "0" ]; then
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logger -t "$NODE" "Modem interface: $iface average RSRP=${RSRP} dBm. Min. value ${rsrp} dBm."
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logger -t "$NODE" "Modem interface: $iface is 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: $iface lost connectivity."
|
||||
logger -t "$NODE" "Modem interface: $iface is loss connectivity"
|
||||
fi
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||||
else
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||||
logger -t "$NODE" "WARNING: RSRP value not available. Check 'Refresh signal' option of modem interface!"
|
||||
logger -t "$NODE" "WARNING: RSRP value not exist. Please check \"Resfesh signal\" option of modem interface!"
|
||||
fi
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||||
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||||
if [ "${#apn}" -gt 0 ]; then
|
||||
uci set network."$iface".apn="$apn"
|
||||
if [ "${#apn}" -gt "0" ]; then
|
||||
uci set network.$iface.apn="$apn"
|
||||
logger -t "$NODE" "Switch SIM-card slot with APN: $apn"
|
||||
else
|
||||
logger -t "$NODE" "WARNING: APN not defined. Switching SIM-card slot with default APN."
|
||||
uci set network."$iface".apn="internet"
|
||||
logger -t "$NODE" "WARNING: APN not defined. Switch SIM-card slot with default APN."
|
||||
uci set network.$iface.apn="internet"
|
||||
fi
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||||
|
||||
uci commit network
|
||||
reload_config
|
||||
reload_config network
|
||||
|
||||
if [ "$revert" = "1" ]; then
|
||||
if [ "$cur_sim" -eq "$sim_value" ]; then
|
||||
FBT=${FBT:=$(( (interval + times_rsrp) * 2 ))}
|
||||
FBT=$(( FBT * 2 ))
|
||||
SWDATE=$(( $(date +%s) + FBT ))
|
||||
printf 'FBT=%s\nSWDATE=%s\n' "$FBT" "$SWDATE" > /tmp/ssw.vars
|
||||
logger -t "$NODE" "Back to default SIM-slot after $(date -d @"${SWDATE}")"
|
||||
FBT=${FBT:=$((($interval+$times_rsrp)*2))}
|
||||
FBT=$(($FBT*2))
|
||||
SWDATE=$((`date +%s`+$FBT))
|
||||
echo "FBT=$FBT" > /tmp/ssw.vars
|
||||
echo SWDATE=$SWDATE >> /tmp/ssw.vars
|
||||
logger -t "$NODE" "Back to default SIM-slot after $(date -d @${SWDATE})"
|
||||
fi
|
||||
fi
|
||||
|
||||
sw_sim && sleep 20 && reload_iface &
|
||||
|
||||
elif [ "$revert" = "1" ]; then
|
||||
fi
|
||||
if [ "$revert" = "1" ]; then
|
||||
sw_rule && sleep 20 && reload_iface &
|
||||
fi
|
||||
|
||||
cnt=1
|
||||
cnt=0
|
||||
else
|
||||
cnt=$(($cnt+1))
|
||||
fi
|
||||
fi
|
||||
done
|
||||
done
|
||||
Reference in new issue
Block a user