About the range of sniffed frequency band in nRF Sniffer

RE: About the range of sniffed frequency band in nRF Sniffer

user114127 — Tue, 31 May 2022 13:57:58 GMT

Hi Hung,

Aha, got it. Thanks!

BTW, your blog is awesome. I will take a closer look at it.

Really appreciate your help and wish you a nice day.

Best regards :-)

Ethan

RE: About the range of sniffed frequency band in nRF Sniffer

Hung Bui — Tue, 31 May 2022 13:51:28 GMT

Hi Ethan,
It's included in the connect request. You can have a look at my blog here at section A-II: https://devzone.nordicsemi.com/guides/short-range-guides/b/bluetooth-low-energy/posts/bluetooth-smart-and-the-nordics-softdevices-part-2

As far as I know this information is not available to the application and is handling by the MAC layer in the stack.

RE: About the range of sniffed frequency band in nRF Sniffer

user114127 — Tue, 31 May 2022 13:00:36 GMT

Hi Hung,

Got it. Thanks a lot!

By the way, how could the sniffer read the channel map on the air? Will it also be possible for us to read the AFH channel map on the air in both SDKs (nRF5 SDK and nRF Connect SDK)? If yes, by what API then?

Appreciate it a lot.

Best regards :-)

Ethan

RE: About the range of sniffed frequency band in nRF Sniffer

Hung Bui — Tue, 31 May 2022 12:35:59 GMT

Hi Ethan,

Your second assumption was correct.
The sniffer when following a connection will jump the frequencies with the two peers in the connection. It read the channel table and hop the frequency the same as other devices in the connection.
During this the sniffer won't be able to sniff anything else (advertising packet or other connections)