#!/bin/sh
# R3B board-side READ-ONLY observer. Writes only /run/r3b (tmpfs). Every 2 s: host/LTE reachability + controller/MM/rmtfs/wwan0 state.
# Every 5th sample adds mmcli state. Any change of the key fields -> one line to /dev/kmsg (visible on passive UART).
trap '' HUP; O=/run/r3b; mkdir -p $O; L=$O/obs.log; last=; n=0
while :; do n=$((n+1))
	u=$(cut -d' ' -f1 /proc/uptime)
	h=$(ping -c1 -W1 172.16.42.2 >/dev/null 2>&1 && echo up || echo DOWN)
	l=$(ping -c1 -W1 -I wwan0 77.88.8.8 >/dev/null 2>&1 && echo ok || echo FAIL)
	s=$(cat /run/aurora-modem/state 2>/dev/null)
	w=$(cat /sys/class/net/wwan0/operstate 2>/dev/null); a=$(ip -4 -o addr show wwan0 2>/dev/null | awk '{print $4}')
	ua=$(ip -4 -o addr show usb0 2>/dev/null | awk '{print $4}'); uc=$(cat /sys/class/net/usb0/carrier 2>/dev/null)
	mm=$(pidof ModemManager); rf=$(pidof rmtfs); am=$(ps | grep -c '[/]usr/sbin/aurora-modem'); lc=$(wc -l < /run/aurora-modem/lifecycle.log)
	ms=
	if [ $((n % 5)) = 1 ]; then ms=$(timeout 8 mmcli -m any 2>/dev/null | tr -d '\033' | sed 's/\[[0-9;]*m//g' | grep -E '\| +(state|registration|access tech): ' | awk -F': ' '{print $2}' | tr -d ' ' | tr '\n' '/')
		b=$(timeout 8 mmcli -b 1 2>/dev/null | tr -d '\033' | sed 's/\[[0-9;]*m//g' | grep -m1 'connected:' | awk -F': ' '{print $2}'); ms="mm=$ms bearer1=$b"; fi
	echo "$u host=$h lte=$l state=$s wwan0=$w,$a usb0=$ua,c$uc mm_pid=$mm rmtfs_pid=$rf am_procs=$am lc_lines=$lc $ms" >> $L
	k="host=$h lte=$l state=$s wwan0=$w,$a usb0=$ua,c$uc mm=$mm rmtfs=$rf am=$am lc=$lc"
	[ "$k" != "$last" ] && echo "<5>[r3b-obs] $u $k" > /dev/kmsg; last=$k
	sleep 2
done