Why does the phone direction connect ble device when the ble device is connected?

[CFF.K]

hi, 

I have some questions from test ble speaker(ex: JBL, Sony) or Air Pods.

First of all, I use two iphones to bond one airpods or ble speaker. (Below let me call two iphone are A iphone and B iphone)

When the A iphone to connect airpods, I can press connect airpods in "Settings -> Bluetooth-> AirPods" of B iphone.

And then the airpods will connect with B iphone and disconnect A iphone.

Question:

Q1: Why does the B phone direction connect airpods when A phone connect airpods? (In addition, I use iphone "Settings -> Bluetooth" and nRF Connect to scan, but scan nothing in list)

Q2: Could the nRF52 do the same function? 

[ovrebekk]

Hi

All current Bluetooth audio solutions are based on classic Bluetooth (also referred to as BR/EDR), not BLE. 

We don't support this in any of our products, so the nRF52 would not be suitable for this kind of application unfortunately. 

Best regards
Torbjørn

[CFF.K]

Hi

What could save power If all bluetooth audio are based on classic Bluetooth?  (Like airpods)

[ovrebekk]

Hi 

I assume classic Bluetooth solutions are also improved over time to reduce power consumption. 

For the long term we expect audio to move to Bluetooth low energy also, but this probably several years out still. 

Best regards
Torbjørn

[CFF.K]

Hi

Excuse me, In my Question 1, you said the device is based on classic Bluetooth. Therefore, another bond phone could connect this device when the device is connected.

This classic Bluetooth protocol? Does The classic Bluetooth not distinguish between ADV channel or connect channel?

[awneil]

As noted, Nordic don't have any Classic BT products - so this is really not the place to ask such questions.