what is the LL_PAUS_ENC_REQUEST and when the softdevice send this request?

[alireza sadeghpour]

Hi,

I am developing a product based on nrf52840 soc as a central bluetooth device. i want to connect nad pair to a bluetooth device (as slave) while it is advertising.

while the connection is established and credentials is exchaned successfully during pairing, the process fails because softdevice sends an LL_PAUSE_ENC_REQ reqeust to the master and this cause the connection to be droped.

in the attached sniffer log, in the packet 15682 you can see that the softdevice (which act as central in the connection) sends LL_PAUSE_ENC_REQ.

now my question is, whats is the LL_PAUSE_ENC_REQ request and during which situation softdevice sends this? is there any API to avoid softdevice send this request?

P.S, i want to note that my device connect and pair with android/ios phones and this problem occurs with an specific ble device.

any advice or hint would be really appreciated
sincerely

8623.trace.pcapng

[Amanda Hsieh]

Hi, 

What SD and version are you using?

Is it possible to provide the debug log on the device?

In the packet 15682, I don't see master sent LL_PAUSE_ENC_REQ. Could you kindly point out?

Are you able to provide the sniffer log starting before the connection?

Regards,
Amanda