Connection terminated by remote user, why?

[PingISTL]

Dear All

I tried to connect to an apple device, it is successful but soon after that, it is disconnected with reason code 0x13 - terminated by remote user, I tried to change the connection parameters to its preference, and disconnection still happens . Here is the log file using nrf connection desktop as suggested by the post here connection parameters ,  sorry I accidently closed the ticket, so have to open a new discussion here. The MAC address of the device is AC233F8153CE, the connection/disconnection happens at the end of logs. Can someone have a look at it and let me know the reason please?

Thank you.

Ping 

2022-06-14T11_22_34.031Z-log.txt

[Sigurd]

Hi,

A sniffer trace might give us some more insight to what happens. Please capture a sniffer trace of the behavior. https://www.nordicsemi.com/Products/Development-tools/nRF-Sniffer-for-Bluetooth-LE

[PingISTL]

Hi, Sigurd

I don't think my application is calling the disconnect function somewhere, here is the screenshot for it. the highlighted line on No 329, seems like the slave is initiate the LL_TERMINTE_IND, am I right? 

Also, it happens with nrf Connect mobile app when I try to connect it with my phone. But this doesn't happen with BeaconSimulator App running on phone.

Regards!

Ping

[Sigurd]

PingISTL said:

the highlighted line on No 329, seems like the slave is initiate the LL_TERMINTE_IND, am I right? 

Is the slave the nRF52 or the apple device?

AC233F8153CE is nrf52 or apple device?

[PingISTL]

slave is Apple device -AC233F8153CE, it is a beacon. Master is my central app or phone.

Ping

[Sigurd]

PingISTL said:

seems like the slave is initiate the LL_TERMINTE_IND, am I right?

Correct. The slaves terminates the connection. If you have the firmware for this slave, then as mentioned, it's likely calling bt_conn_disconnect() somewhere, and maybe you can try place a breakpoint at these locations, debug and find out why it's being called.

[PingISTL]

Unfortunately, this is one of Apple's product, and I don't have source code to access it, my project now is develop an central application talking to other peripherals like this one.

Thank for reply!

Ping

[Sigurd]

Ok, I see. Maybe you could try the Apple Developer Support. https://developer.apple.com/support/