HOW THE CONNECT THE PERIPHERAL USING THAT DEVICE MAC ADDRESS THROUGH THE CENTRAL DEVICE(WHICH IS MY BOARD NRF52833DK)

RE: HOW THE CONNECT THE PERIPHERAL USING THAT DEVICE MAC ADDRESS THROUGH THE CENTRAL DEVICE(WHICH IS MY BOARD NRF52833DK)

Einar Thorsrud — Fri, 12 Sep 2025 08:36:49 GMT

Hi,

I do not see any connection attemt in the screenshot but the time between advertising packets sticks out as quite long and variabe. It might not be related, but I wonder what the advertising interval is and what environment you are testing in? Can you upload the full sniffer trace?

Normally I would ask to configure the sniffer to follow any connection established for that advertiser as described here. Howeer, as the error is BT_HCI_ERR_UNKNOWN_CONN_ID, it is likely that the nRF neve rattempts to connect.

Given that advertising packets are received quite rarely by the sniffer, I wonder if the timeout when establishing the connectiong is a problem? I see you do not set a specific timeout, which meanst hat the default timeout from CONFIG_BT_CREATE_CONN_TIMEOUT is used. Does it make a difference if you set this to a high value in your prj.conf? For instance CONFIG_BT_CREATE_CONN_TIMEOUT=60 would give a 60 second timeout.

RE: HOW THE CONNECT THE PERIPHERAL USING THAT DEVICE MAC ADDRESS THROUGH THE CENTRAL DEVICE(WHICH IS MY BOARD NRF52833DK)

ankita_lengare — Thu, 11 Sep 2025 09:25:29 GMT

hi,

ok let me expian you the steps which i followd and also below i will attache the screenstop so you can view that and tell me where i am missing step
1)firstly i will open the nRF connect for desktop tool -> programmer section -> i will connect to the board nRF52833dk board -> add file i have attached .hex file (blow attached) -> i clicked erase & write option

2) in this step i will open the wireshark tool and in capture section i see nrf sniffer for bluetooth LE com 7 i start capturing

3) in this step i will open vscode and build my code which is shard with you previously that was build and flashed to board

4)after that i will go to wireshak tool i added the below filter btle.advertising_address == 7c:d9:f4:14:05:a8 and whati received that screen shot attached blow

so i am not understaing what should i do next and aslo where is the problem in code i think in central code is not sending any connection request can you check and tell me , in code which part what should i change??

RE: HOW THE CONNECT THE PERIPHERAL USING THAT DEVICE MAC ADDRESS THROUGH THE CENTRAL DEVICE(WHICH IS MY BOARD NRF52833DK)

Einar Thorsrud — Wed, 10 Sep 2025 12:56:47 GMT

Hi,

I do not see any connection attempt in that trace. Can you test again and verify that you do not see any?

RE: HOW THE CONNECT THE PERIPHERAL USING THAT DEVICE MAC ADDRESS THROUGH THE CENTRAL DEVICE(WHICH IS MY BOARD NRF52833DK)

ankita_lengare — Wed, 10 Sep 2025 12:38:37 GMT

ok i have attached that file devzone.nordicsemi.com/.../0211.pcapng

RE: HOW THE CONNECT THE PERIPHERAL USING THAT DEVICE MAC ADDRESS THROUGH THE CENTRAL DEVICE(WHICH IS MY BOARD NRF52833DK)

Einar Thorsrud — Tue, 09 Sep 2025 11:56:57 GMT

Hi,

The error BT_HCI_ERR_UNKNOWN_CONN_ID means that the connection was aborted or timed out. I do not see any indication that you explicitly disconnect here, so a timeout is more likely. However, I see you filter on only connectable advertising. Could it be that the peripheral discregards the connection for some reason (perhaps it is using a whitelist / filter accept list)? Do you have a sniffer trace so that we can see what is happeing on air?