Swift and ESP32 do not connect via BLE. Why?

Question

Arduino

I'm trying to make friends with iOS and ESP.
I installed the BLE_server example from the ESP32 BLE Arduino library on the ESP. I installed the LightBlue
application on iOS , everything works through it. I'm trying to understand this application, https://github.com/RickRedSix/BLE4.0-iOS-Swift-Demo but the following happens: 1. Devices are paired 2. When I try to send data, numbers start to come to the device in ascending order, and the application flies out. Help))