1PRIMARY_SERVICE, GAP_SERVICE 2CHARACTERISTIC, GAP_DEVICE_NAME, READ, "BTstack" 3CHARACTERISTIC, GAP_APPEARANCE, READ, 00 00 4 5PRIMARY_SERVICE, GATT_SERVICE 6CHARACTERISTIC, GATT_SERVICE_CHANGED, READ, 7 8PRIMARY_SERVICE, FFF0 9CHARACTERISTIC, FFF1, READ | WRITE | DYNAMIC, 10CHARACTERISTIC, FFF2, READ | WRITE | DYNAMIC, 11CHARACTERISTIC, 00001234-0000-1000-8000-00805F9B34FB, READ | WRITE | DYNAMIC, 12