No response to connect to Bluetooth in car

[sampan]

I want to set my phone to unlock the car door automatically after connecting to the Bluetooth of the car, my phone is Redmi k50, the car is BYD Qinplus, I set up a series of screen operations to unlock the car door automatically after detecting the Bluetooth connection to the car, I use other Bluetooth devices to test and can pass, but the phone doesn't have any reaction when I am close to the car, and I can see that the Bluetooth has been connected on the BYD app. I can see on the BYD app that the bluetooth is connected.

 

[sampan]

Another question, not all bluetooth devices show up in the bluetooth connection of the trigger, for example, my Xiaomi bracelet doesn't show up on it, why is that?

 

[JA-Translator]

If possible, can you write in English in this forum?
That'd be more smooth communication and you could get better advice.
Unfortunately, many of us can't understand Chinese.

 

[Endercraft]

If possible, can you write in English in this forum?
That'd be more smooth communication and you could get better advice.
Unfortunately, many of us can't understand Chinese.

I already edited and warned.

Concerning the problem, I'm not exactly sure what the problem is. If your phone is from Xiaomi, it's better to have this permission enabled :