Pi port: serial transport, addressed ESP-NOW bridge, port 80

- Run app on Raspberry Pi: serial to ESP32 bridge at 912000 baud, /dev/ttyS0
- Remove ESP-NOW/MicroPython-only code from src (espnow, p2p, wifi, machine/Pin)
- Transport: always send 6-byte MAC + payload; optional to/destination_mac in API and WebSocket
- Settings and model DB use project paths (no root); fix sys.print_exception for CPython
- Preset/settings controllers use get_current_sender(); template paths for cwd=src
- Pipfile: run from src, PORT from env; scripts for port 80 (setcap) and test
- ESP32 bridge: receive 6-byte addr + payload, LRU peer management (20 max), handle ESP_ERR_ESPNOW_EXIST
- Add esp32/main.py, esp32/benchmark_peers.py, scripts/setup-port80.sh, scripts/test-port80.sh

Made-with: Cursor

scripts/test-port80.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+# Test the app on port 80. Run after: sudo scripts/setup-port80.sh
+# Usage: ./scripts/test-port80.sh
+
+set -e
+cd "$(dirname "$0")/.."
+APP_URL="${APP_URL:-http://127.0.0.1:80}"
+
+echo "Starting app on port 80 in background..."
+pipenv run run &
+PID=$!
+trap "kill $PID 2>/dev/null; exit" EXIT
+
+echo "Waiting for server to start..."
+for i in 1 2 3 4 5 6 7 8 9 10; do
+  if curl -s -o /dev/null -w "%{http_code}" "$APP_URL/" 2>/dev/null | grep -q 200; then
+    echo "Server is up."
+    break
+  fi
+  sleep 1
+done
+
+echo "Requesting $APP_URL/ ..."
+CODE=$(curl -s -o /dev/null -w "%{http_code}" "$APP_URL/")
+if [ "$CODE" = "200" ]; then
+  echo "OK: GET / returned HTTP $CODE"
+  curl -s "$APP_URL/" | head -5
+  echo "..."
+  exit 0
+else
+  echo "FAIL: GET / returned HTTP $CODE (expected 200)"
+  exit 1
+fi