CSI data issues

[yjxb1]

1. I have been pinging data to the router through a raspberry pie and can collect CSI data. However, how can I determine how many sender packets make up the 1042 bytes of CSI data collected in UDP packets?
2. I will use the router (two antennas) as the receiving end and a raspberry pie as the sending end (one antenna). Does it indicate that CSI data is sent twice? I followed the steps of the laboratory to collect CSI without setting up MIMO, so what is the default sending and receiving for this firmware? If I want to send and receive more, how should I set it up?