BLE Sniffer stops when a connection established

Question

Hi, 
 
 I used this user guide: https://infocenter.nordicsemi.com/pdf/nRF_Sniffer_UG_v2.2.pdf . 
 I am using the nRF52840 DK for the sniffer, and managed to connect it and see the advertising data for the peripheral (nRF52840) BLE. 
 When I power on the central board (another nRF52840) I stop receiving sniffer data from the peripheral board, and not sure if the connection is really established. 
 When I don't power on the sniffer the connection between the two nRF52840 boards done as expected. 
 
 Without the sniffer I don't face any problems, when I sniff the peripheral board with the central turned off it works and I got the sniffer data for the advertising data from the peripheral, but I still facing a problem when I turn on the central board. 
 Please help me to fix this issue, I need to see the data passed between my peripheral and the central board. 
 Best Regards 
 JK

Simonr · Accepted Answer

Hi 
 Can you confirm that you have chosen the correct peripheral device from the "Device list" mentioned in section 3.1 of the User guide. Does the peripheral and central not connect as intended if the sniffer is on, how do you see that the connection is established as intended when the sniffer is off? 
 If the devices are already paired, the issue might be that they detect the sniffer device and cancel the connection due to the sniffer device not having the correct OOB key. Please check out the Just Works -sniffing an encrypted connection and Sniffing a connection between devices that are already paired on pages 15 and 16 in the nRF sniffer user guide for more information on how to sniff a secure connection. 
 Best regards, 
 Simon

BLE Sniffer stops when a connection established

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