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[Bizadi]

Good day;

I read the relevant posts. But I'm confused and do not understand. 

1. What is the best way to identify the requesting device? Its specification identify is unique to each device(like a smartphone) and user can't change it.

2. Can user be changed UUID on smartphone?
3. How can I store the identity of the device requesting a peripheral connection in a variable?

I want to save characteristic authorized devices for connections in a array and send it with UART.

It is better clarified in the following figure:

[Hung Bui]

Hi Arizan, 
Could you explain from where you get the diagram ? It doesn't look like something that we made or something related to BLE. 

[Bizadi]

no . I make this to clarify and explain my questions. Is it wrong?

[Hung Bui]

I don't think you are using Bluetooth terms in your diagram. 

There is no way to get the device identity without doing bonding. The identity is only exchanged after the link has been encrypted. 
You can get the device's address when you get connected but that doesn't guarantee that you have the static address or if the device won't change the address in the future. 

I would suggest to study a little bit more on Bluetooth terms and the spec. You can read a little bit more about the bluetooth address and privacy here: https://www.novelbits.io/bluetooth-address-privacy-ble/

[Bizadi]

1. I just want the names of the variables. For example, the variable that receives the request from the central scanner or a variable that sends confirmation to the scanner.

[Hung Bui]

I'm not sure I understand what you're trying to describe. 
Please clarify which platform are you developing your application ? nRF5 SDK or NCS SDK ? 
Have you tried any of our example ?