Add web GUI, docs, scripts, and 5G router config

- Web app (Flask): status, config, firewall, logs, users, restart
- Docs: AT commands, deploy, DNS, quickstart, web GUI
- Scripts: connect, deploy, diag, healthcheck, modem-status, speedtest, status, troubleshoot
- Init and iptables: 5g-router, 5g-webgui, rules.v4
- CHANGELOG, TODO, REVISION; config and README updates

scripts/diag-at-port.sh

@@ -0,0 +1,92 @@
+#!/bin/sh
+# Alpine 5G Router – AT port diagnostic (run on device to debug “No modem AT data”)
+# Rev: 1  (see REVISION in repo root)
+# Usage: ./diag-at-port.sh   or   /usr/local/bin/diag-at-port.sh
+
+CONFIG="/etc/5g-router.conf"
+AT_PORT="${AT_PORT:-/dev/ttyUSB1}"
+[ -f "$CONFIG" ] && . "$CONFIG"
+
+echo "=== Alpine 5G Router – AT port diagnostic ==="
+echo ""
+
+# 1) User and permissions
+echo "--- User & groups ---"
+echo "User: $(id -un) (uid=$(id -u) gid=$(id -g))"
+echo "Groups: $(id -Gn)"
+if id -Gn | grep -q dialout; then
+    echo "dialout: YES (can access serial ports)"
+else
+    echo "dialout: NO – add user to dialout: adduser <user> dialout"
+fi
+echo ""
+
+# 2) Serial devices
+echo "--- Serial devices ---"
+for d in /dev/ttyUSB* /dev/ttyACM*; do
+    [ -e "$d" ] || continue
+    ls -la "$d" 2>/dev/null
+done
+if ! ls /dev/ttyUSB* /dev/ttyACM* 2>/dev/null | grep -q .; then
+    echo "No /dev/ttyUSB* or /dev/ttyACM* found. Modem may not be in USB mode 40 or not bound."
+fi
+echo ""
+
+# 3) Modem USB
+echo "--- Modem (lsusb) ---"
+lsusb 2>/dev/null | grep -i fibocom || echo "No Fibocom device in lsusb"
+lsusb 2>/dev/null | grep -i "0e8d" || true
+echo ""
+
+# 4) Config
+echo "--- Config ---"
+echo "AT_PORT from config: $AT_PORT"
+if [ -c "$AT_PORT" ]; then
+    echo "  -> exists and is a character device"
+else
+    echo "  -> missing or not a character device"
+fi
+echo ""
+
+# 5) Raw AT probe on each ttyUSB
+echo "--- Raw AT probe (send AT, show response) ---"
+for port in /dev/ttyUSB0 /dev/ttyUSB1 /dev/ttyUSB2 /dev/ttyUSB3; do
+    [ -c "$port" ] || continue
+    echo "Port $port:"
+    out=$(timeout 4 sh -c "
+        cat $port 2>/dev/null &
+        _p=\$!
+        sleep 0.3
+        echo -e 'AT\r' > $port 2>/dev/null
+        sleep 1
+        kill \$_p 2>/dev/null
+    " 2>/dev/null)
+    if echo "$out" | grep -q 'OK'; then
+        echo "  -> OK (modem responded)"
+    else
+        echo "  -> no OK in response (raw below)"
+    fi
+    echo "$out" | head -5 | sed 's/^/  /'
+    echo ""
+done
+if ! ls /dev/ttyUSB* 2>/dev/null | grep -q .; then
+    echo "No ttyUSB devices to probe."
+fi
+echo ""
+
+# 6) modem-status-at.sh if present
+echo "--- modem-status-at.sh ---"
+if [ -x "/usr/local/bin/modem-status-at.sh" ]; then
+    echo "Running: /usr/local/bin/modem-status-at.sh"
+    out=$(timeout 20 /usr/local/bin/modem-status-at.sh 2>&1)
+    code=$?
+    echo "Exit code: $code"
+    echo "$out" | head -15
+    if [ "$code" != 0 ] || echo "$out" | grep -q '^{}$'; then
+        echo "... (no modem JSON or script failed)"
+    fi
+else
+    echo "Not found at /usr/local/bin/modem-status-at.sh (install with scripts/install.sh)"
+fi
+echo ""
+echo "=== End diagnostic ==="