nrf51 DK BLU sniffer has no devices listed in Device drop-down

[eric7L]

I have a smartwatch, smartphone, and tablet.

I went to some place without any other bluetooth devices, my devices are able to scan and pair with each other. But nRF-51 not able to see any of those devices in the Wireshark Device drop-down. It is empty. And then I went back to the lab and I'm able to see all other Bluetooth devices with nRF-51. 

I'm using the OS X runs the nRF Sniffer software v2. Wireshark V2.4.2. SEGGER J-Link v6.16c. 

I tried all the common sniffing actions in "nRF_Sniffer_User_Guide_v2.1.pdf", I just cannot find my devices in Devices drop-down list. 

I have tried those actions:

  1. Before the devices pair, I turn on the Bluetooth scanning mode in each device, my Wireshark Devices drop-down list is empty. 

  2. During the devices paring, my Wireshark Devices drop-down list still empty.

  3. After the devices paired, my Wireshark Devices drop-down list still empty.

This screenshot shows that I am able to see other devices besides my watch, phone, and tablet.  

I saw a thread from Stack overflow mentions about the Bluetooth LE peripheral mode. I'm not sure if this causes my problem here. 

[eric7L]

its there anything else I need to add to help? thank you

[Hung Bui]

Hi Eric, 

 

What do you expect to see of those device (smartwatch, smartphone, and tablet.) in the sniffer ? 

Are you sure they actually do BLE advertising ? Smart Phone and Tablet usually don't do any BLE advertising if it's not from the app. 

The smart watch may do BLE advertising if it's not in a connection and if it actually do BLE. Many smartwatches actually use classic Bluetooth instead. 

The nRFSnifer can only follow a connection if it can track the connection establishing process. Basically you need to select the device in the drop down list when it's advertising, and then after that you start the connection. 

[eric7L]

thank you for the reply. is that mean if the watch quit the app, the nRFSnifer will no longer to follow a connection between watch and smartphone?

[eric7L]

The watch is using Bluetooth 4.1 LE. does nRFSnifer support it?

[Hung Bui]

Yes, if it actually use Bluetooth Low Energy.

What I would suggest you to do is to disconnect the watch from the phone (turn off Bluetooth on the phone), unpair it if possible. Start your sniffer, check if your watch appear in the list. If it does, select it in the drop down menu. 

Then you turn Bluetooth on your phone and start pairing with the watch. This time your sniffer should be able to follow the connection.