Merge pull request #4 from comoc/add-cccd-2902

add BLE2902
(to accept notify registration at the client.)

src/Ble_esp32.h

@@ -202,6 +202,9 @@ bool BleMidiInterface::begin(const char* deviceName)
                                                      BLECharacteristic::PROPERTY_NOTIFY |
                                                      BLECharacteristic::PROPERTY_WRITE_NR
                                                      );
+    // Add CCCD 0x2902 to allow notify
+    _characteristic->addDescriptor(new BLE2902());
+
     _characteristic->setCallbacks(new MyCharacteristicCallbacks(this));
     // Start the service
     service->start();