feat(bridge): add wifi/serial bridge runtime and UI

Co-authored-by: Cursor <cursoragent@cursor.com>

bridge-wifi/src/settings.py

@@ -0,0 +1,60 @@
+import json
+import time
+import ubinascii
+import network
+
+WIFI_CHANNEL_DEFAULT = 5
+
+
+def _sta_mac_hex():
+    sta = network.WLAN(network.STA_IF)
+    was_on = sta.active()
+    if not was_on:
+        sta.active(True)
+        time.sleep_ms(50)
+    try:
+        mac = ubinascii.hexlify(sta.config("mac")).decode().lower()
+    except Exception:
+        mac = "000000000000"
+    if not was_on:
+        sta.active(False)
+    return mac
+
+
+class Settings(dict):
+    SETTINGS_FILE = "/settings.json"
+
+    def __init__(self):
+        super().__init__()
+        self.load()
+
+    def set_defaults(self):
+        self["name"] = "bridge-" + _sta_mac_hex()
+        self["wifi_channel"] = WIFI_CHANNEL_DEFAULT
+        self["ap_password"] = ""
+        self["ap_ip"] = "192.168.4.1"
+        self["ws_port"] = 80
+        self["debug"] = True
+
+    def save(self):
+        try:
+            with open(self.SETTINGS_FILE, "w") as f:
+                f.write(json.dumps(self))
+        except Exception as e:
+            print("save settings:", e)
+
+    def load(self):
+        try:
+            with open(self.SETTINGS_FILE, "r") as f:
+                loaded = json.load(f)
+            if not isinstance(loaded, dict):
+                raise ValueError("not object")
+        except Exception:
+            self.clear()
+            self.set_defaults()
+            self.save()
+            return
+        self.clear()
+        self.set_defaults()
+        for k, v in loaded.items():
+            self[k] = v