add init() return check, controller status, and MAC address debug

src/ble_midi_transport.cpp

@@ -44,20 +44,25 @@ BleMidiTransport::~BleMidiTransport() {
 bool BleMidiTransport::begin() {
     Serial.println("[BLE] Initializing BLE MIDI...");
 
-    // NimBLE-Arduino v1.4.0+ handles ESP32-S3 internally, using
-    // bt_cfg.bluetooth_mode = ESP_BT_MODE_BLE. Do NOT pre-init the
-    // BT controller here or NimBLEDevice::init() will see an
-    // error from double-init and abort via ESP_ERROR_CHECK.
     Serial.println("[BLE] NimBLEDevice init...");
-    NimBLEDevice::init("JOC Midi");
+    if (!NimBLEDevice::init("JOC Midi")) {
+        Serial.println("[BLE] ERROR: NimBLEDevice::init() FAILED!");
+        return false;
+    }
     Serial.println("[BLE] NimBLEDevice initialized");
 
+    esp_bt_controller_status_t ctl = esp_bt_controller_get_status();
+    Serial.printf("[BLE] Controller status: %d (0=IDLE 1=INITED 2=ENABLED)\n", ctl);
+
     Serial.println("[BLE] Creating server...");
     ble_server = NimBLEDevice::createServer();
     if (!ble_server) {
         Serial.println("[BLE] FAILED to create server");
         return false;
     }
+    NimBLEAddress addr = NimBLEDevice::getAddress();
+    Serial.printf("[BLE] Address: %s\n", addr.toString().c_str());
+
     Serial.println("[BLE] Server created, setting callbacks...");
     ble_server->setCallbacks(new ServerCallbacks());