pi4 frame injection

[yjxb1]

I want to use pi4 to inject data frames, and keep sending data frames to another Raspberry Pi to collect CSI data. I've installed nexmon but I don't know how to use frame injection. Can someone answer my questions? Thank you so much.

[jlinktu]

There are many possibilities you could do this.
Here is an example using scapy in python to craft and inject a very basic Data frame with a payload of 0x12345678 roughly every 500ms.
Make sure you added a monitor interface that is up and disabled power save mode before running this (interface named mon0 here).

#!/usr/bin/python
from scapy.all import *
dot11 = Dot11FCS(addr1="00:11:22:33:44:55",
              addr2="00:11:22:33:44:56",
              addr3="00:11:22:33:44:57",
              type="Data",
              subtype="Data")
data = '\x12\x34\x56\x78'
packet = RadioTap()/dot11/data
sendp(packet,iface="mon0",loop=1,inter=0.5)