Sniffer Trace Shows Duplicate packets

[VinuGopalakrishnan]

I'm seeing duplicate data packets while analyzing our sniffer trace from NRF5340 to iOS app. However, there is no packet loss or any impact on data rate.

What might be the reason for this ? PFA trace for the same -

sequence-ios14-v01-aug21.pcapng

regards,

Vinu

[Kenneth]

Hello,

It would be good if you can specify the number in the log where you see duplicate packets. But in general duplicate packets occur for instance due to noise cause packet loss, hence a retransmit occurs. You should be able to look at the sequence number in the data header if it's a retransmit (since those don't change either). Sometimes the sniffer will be able to receive the packet even though it was not successfully received by one of the peers.

Kenneth

[VinuGopalakrishnan]

Thanks Kenneth. Packet loss might be an issue as we have a lot of interference. Is this related to frequency hopping?

[Kenneth]

In the 2.4GHz band it's a lot of traffic, some stationary, but some frequency hopping. It could be anything yes.

Kenneth

[VinuGopalakrishnan]

Thanks Kenneth!