How to find port of bluetooth

First of all, I am new to programming. I am trying to develop a unity program that reads and writes data from the esp32 serial port over Bluetooth. one thing I noticed is every time I connect esp32 over Bluetooth the port number changes. and also 2 ports showing on the device manager. my question is there any way to auto-detect the serial port of the Bluetooth of esp32 and set up the correct port.
And sorry for such a silly question