Add ESP32 BLE scanner sketch

tools/esp32_ble_scan/esp32_ble_scan.ino

@@ -0,0 +1,50 @@
+#include <NimBLEDevice.h>
+
+void setup() {
+  Serial.begin(115200);
+  delay(1000);
+
+  Serial.println();
+  Serial.println("=== ESP32 BLE Scanner ===");
+  Serial.println("Looking for JBD/Xiaoxiang BMS...");
+  Serial.println();
+
+  NimBLEDevice::init("");
+
+  NimBLEScan* scan = NimBLEDevice::getScan();
+  scan->setActiveScan(true);
+  scan->setInterval(100);
+  scan->setWindow(99);
+}
+
+void loop() {
+  NimBLEScan* scan = NimBLEDevice::getScan();
+
+  Serial.println("Scanning for 10 seconds...");
+  NimBLEScanResults results = scan->getResults(10, false);
+
+  Serial.print("Devices found: ");
+  Serial.println(results.getCount());
+
+  for (int i = 0; i < results.getCount(); i++) {
+    const NimBLEAdvertisedDevice* device = results.getDevice(i);
+
+    Serial.print("Device ");
+    Serial.print(i);
+    Serial.print(" | Address: ");
+    Serial.print(device->getAddress().toString().c_str());
+
+    Serial.print(" | RSSI: ");
+    Serial.print(device->getRSSI());
+
+    if (device->haveName()) {
+      Serial.print(" | Name: ");
+      Serial.print(device->getName().c_str());
+    }
+
+    Serial.println();
+  }
+
+  Serial.println();
+  delay(3000);
+}