Initial commit: ESP32-S3-RLCD-4.2 hardware utility classes and demo

wifi_util.py

@@ -0,0 +1,28 @@
+import network
+
+class WiFiUtil:
+    def __init__(self):
+        self.wlan = network.WLAN(network.STA_IF)
+        self.wlan.active(True)
+
+    def scan(self):
+        """Scans for networks and returns a list of dictionaries with ssid and rssi."""
+        print("Scanning for Wi-Fi networks...")
+        networks = self.wlan.scan()
+        result = []
+        for net in networks:
+            # network tuple: (ssid, bssid, channel, RSSI, authmode, hidden)
+            try:
+                ssid = net[0].decode('utf-8')
+            except Exception:
+                try:
+                    ssid = ''.join(chr(b) if 32 <= b < 127 else '?' for b in net[0])
+                except Exception:
+                    ssid = "<Unknown SSID>"
+            rssi = net[3]
+            if ssid: # Filter out hidden/empty SSIDs
+                result.append({"ssid": ssid, "rssi": rssi})
+        
+        # Sort by signal strength (RSSI) descending
+        result.sort(key=lambda x: x['rssi'], reverse=True)
+        return result