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

src/util/espnow_message.py

@@ -1,7 +1,8 @@
 """
-ESPNow message builder utility for LED driver communication.
+Message builder for LED driver API communication.
 
-This module provides utilities to build ESPNow messages according to the API specification.
+Builds JSON messages according to the LED driver API specification
+for sending presets and select commands over the transport (e.g. serial).
 """
 
 import json
@@ -9,14 +10,14 @@ import json
 
 def build_message(presets=None, select=None, save=False, default=None):
     """
-    Build an ESPNow message according to the API specification.
-    
+    Build an API message (presets and/or select) as a JSON string.
+
     Args:
         presets: Dictionary mapping preset names to preset objects, or None
         select: Dictionary mapping device names to select lists, or None
-        
+
     Returns:
-        JSON string ready to send via ESPNow
+        JSON string ready to send over the transport
         
     Example:
         message = build_message(

src/util/wifi.py

@@ -1,42 +0,0 @@
-import network
-
-
-def ap(ssid, password, channel=None):
-    ap_if = network.WLAN(network.AP_IF)
-    ap_mac = ap_if.config('mac')
-    print(ssid)
-    ap_if.active(True)
-    if channel is not None:
-        ap_if.config(essid=ssid, password=password, channel=channel)
-    else:
-        ap_if.config(essid=ssid, password=password)
-    ap_if.active(False)
-    ap_if.active(True)
-    print(ap_if.ifconfig())
-
-def get_mac():
-    ap_if = network.WLAN(network.AP_IF)
-    return ap_if.config('mac')
-
-
-def get_ap_config():
-    """Get current AP configuration."""
-    try:
-        ap_if = network.WLAN(network.AP_IF)
-        if ap_if.active():
-            config = ap_if.ifconfig()
-            return {
-                'ssid': ap_if.config('essid'),
-                'channel': ap_if.config('channel'),
-                'ip': config[0] if config else None,
-                'active': True
-            }
-        return {
-            'ssid': None,
-            'channel': None,
-            'ip': None,
-            'active': False
-        }
-    except Exception as e:
-        print(f"Error getting AP config: {e}")
-        return None