bench: net-blip tool; BRINGUP - cloud-mode drills, lid-IR tracks the lid LED, fire gate back to watch-only

scripts/bench/netblip.sh

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+#!/bin/sh
+# Runs ON the board while a cloud session is live: blackhole every
+# established :443 peer and break name resolution for N seconds, then
+# restore both. The cloud client must notice the dead socket, exit toward
+# stopped-and-safe, and the supervisor's respawn must reconnect once the
+# network is back. Usage: netblip.sh [seconds]   (default 75)
+N=${1:-75}
+PEERS=$(netstat -tn 2>/dev/null | awk '$6=="ESTABLISHED" && $5 ~ /:443$/ {split($5,a,":"); print a[1]}' | sort -u)
+echo "blip $N s; peers: $PEERS"
+cp /etc/resolv.conf /tmp/resolv.conf.keep
+for p in $PEERS; do ip route add blackhole "$p/32" 2>/dev/null && echo "blackholed $p"; done
+echo "nameserver 127.0.0.2" > /etc/resolv.conf
+T0=$(date +%s)
+sleep "$N"
+for p in $PEERS; do ip route del blackhole "$p/32" 2>/dev/null; done
+cp /tmp/resolv.conf.keep /etc/resolv.conf
+echo "restored after $(( $(date +%s) - T0 )) s"