tools: connector must not chase port rotation on a live connection

The connector tore down a working adb link whenever the beacon reported a
new port, reconnecting every loop and spamming the phone with "wireless
debugging connected" notifications (~every 8s). Existing connections
survive rotation, so now: if any device-state entry exists for the IP,
leave it; only (dis)connect when there's no working link at all.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tools/adb-beacon/connect.sh

@@ -1,7 +1,16 @@
 #!/usr/bin/env bash
-# Keeps `adb connect` current for every device in the fmr beacon map.
-# Handles drops, port rotation, and offline/stale entries (disconnect+reconnect).
-BEACON="http://89.185.109.150:443/beacon"
+# SPDX-FileCopyrightText: 2026 Echolot contributors
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# PC-side connector for the wireless-adb beacon. Polls the fmr beacon map and
+# ensures each device has a working adb connection.
+#
+# Existing adb connections SURVIVE wireless-debug port rotation, so once a
+# device's IP is connected we leave it ALONE even if the beacon now reports a
+# different port. Chasing the new port would tear down the working link and
+# spam the phone with "wireless debugging connected" notifications. We only
+# (re)connect when NO working entry exists for that IP.
+BEACON="${ECHOLOT_BEACON_URL:-http://89.185.109.150:443/beacon}"
 while true; do
   curl -s --max-time 5 "$BEACON" 2>/dev/null | python -c '
 import json,sys,time
@@ -12,13 +21,14 @@ for dev,v in (d or {}).items():
     if now-v.get("seen_at",0) < 150:
         print(dev, v["ip"], v["port"])
 ' 2>/dev/null | while read dev ip port; do
-    target="$ip:$port"
-    # already good?
-    if adb devices | grep -q "^$target[[:space:]]*device$"; then continue; fi
-    # clear any stale/offline entries for this IP, then connect the current port
-    adb devices | awk -v ip="$ip" '$1 ~ ip {print $1}' | while read stale; do adb disconnect "$stale" >/dev/null 2>&1; done
-    r=$(adb connect "$target" 2>&1)
-    echo "$(date +%H:%M:%S) [$dev] $target -> $r"
+    if adb devices | awk -v ip="$ip" '$1 ~ ("^"ip":") && $2=="device"{f=1} END{exit !f}'; then
+      continue
+    fi
+    adb devices | awk -v ip="$ip" '$1 ~ ("^"ip":"){print $1}' | while read stale; do
+      adb disconnect "$stale" >/dev/null 2>&1
+    done
+    r=$(adb connect "$ip:$port" 2>&1)
+    echo "$(date +%H:%M:%S) [$dev] $ip:$port -> $r"
   done
   sleep 8
 done