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seemoo-lab / nexmon_csi

Channel State Information Extraction on Various Broadcom Wi-Fi Chips
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How to control the delivery rate of UDP packets？ #49

Open coldcoldmilk opened 4 years ago

coldcoldmilk commented 4 years ago

Hello, the paper you gave me last time has solved my question,thanks a lot. @Junye97 @princeulrich2

Now I want to use the extracted CSI data to do some research.

I found that I was using the code tcpdump -i wlan0 DST port 5500

The frequency of UDP packet acquisition is not controlled

So,how to control the delivery rate of UDP packets？for example, I want to get 10 UDP packets in one second.

Junye97 commented 4 years ago

Hi there,

The easiest way is to generate ping packets. You can run 

sudo ping <some_ip> -i <ping_interval>

If you need exactly 10 packets per second, you will need some filtering since there will be control and acknowledge packets transmitted as well.

coldcoldmilk commented 4 years ago

Hi there,

The easiest way is to generate ping packets. You can run

sudo ping <some_ip> -i <ping_interval>

If you need exactly 10 packets per second, you will need some filtering since there will be control and acknowledge packets transmitted as well.

Hi, How should I choose the IP address? Should I use my raspberry PI to select my router's IP address?

dejavo4e commented 3 years ago

Hi there,

The easiest way is to generate ping packets. You can run

sudo ping <some_ip> -i <ping_interval>

If you need exactly 10 packets per second, you will need some filtering since there will be control and acknowledge packets transmitted as well.

hi; what is the default value for the packets per second? Is is dependent on ping command? For 20MHz bandwidth, we have a 1000x64 matrix. Each row is CSI packet ,i guess. columns are sub-carriers. So where is time? thanks in advance @junye97

parisafm commented 3 years ago

Hi there, The easiest way is to generate ping packets. You can run

sudo ping <some_ip> -i <ping_interval>

If you need exactly 10 packets per second, you will need some filtering since there will be control and acknowledge packets transmitted as well.

hi; what is the default value for the packets per second? Is is dependent on ping command? For 20MHz bandwidth, we have a 1000x64 matrix. Each row is CSI packet ,i guess. columns are sub-carriers. So where is time? thanks in advance

hi; hope these explanations are useful for you: Each column is subcarrier. Depending on PHY standard, u can have different numbers of subcarriers. ( as seen in the picture). 933EC517-4905-410A-84A7-3F85FD9A1573

For ping commands check this webpage: https://www.ionos.com/digitalguide/server/tools/ping-command/

About ur last question, i may have same issue. Looking forward to hearing from @Junye97 or others.