fix: use WiFi.macAddress() instead of esp_read_mac (not in Arduino scope)

esp32/uwb_tag/src/main.cpp

@@ -50,6 +50,7 @@
 #include <BLEServer.h>
 #include <BLEUtils.h>
 #include <BLE2902.h>
+#include <WiFi.h>
 #include "DW1000Ranging.h"
 #include "DW1000.h"
 
@@ -1002,9 +1003,9 @@ void setup(void) {
 
     Serial.printf("\r\n[uwb_tag] tag_id=0x%02X  starting (v2 — UWB data frames)\r\n", TAG_ID);
 
-    /* Build BLE device name from MAC */
+    /* Build BLE device name from WiFi MAC last 4 hex digits */
     uint8_t mac[6];
-    esp_read_mac(mac, ESP_MAC_BT);
+    WiFi.macAddress(mac);
     snprintf(g_ble_device_name, sizeof(g_ble_device_name),
              "UWB_TAG_%02X%02X", mac[4], mac[5]);