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open-sdr / openwifi

open-source IEEE 802.11 WiFi baseband FPGA (chip) design: driver, software
GNU Affero General Public License v3.0
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Packet injection function cannot send data packets continuously #117

Closed brealin closed 2 years ago

brealin commented 2 years ago

I use the DEMO board of ADRV9361-Z7035, which has fully run the openwifi function, and my mobile phone can be connected to this board normally, and the throughput test can also reach 30Mbps. I want to monitor the transmit power and signal quality. I study the operation of this page to use the packet injection function to continuously send packets, https://github.com/open-sdr/openwifi/blob/master/doc/app_notes/inject_80211.md. I used a spectrum analyzer to monitor the output signal, but it did not work as expected. The signal on the spectrum analyzer only appears occasionally, and is not continuously sent according to the script setting. I visually observed that the sending frequency is 3-5S and a signal appears. I tried disabling ACK (sdrctl dev sdr0 set reg xpu 11 16 ), but there was no obvious change.

JiaoXianjun commented 2 years ago

Hello,

  1. When you run the injection program, you can specify "-n 999999" to have you "endless" packets
  2. If you use another COTS WiFi device running monitor mode with wireshark, you should see lots of packets in the channel. This means openwifi is transmitting. Do please verify via another COTS WiFi monitor with wireshark.
  3. Make sure your spectrum analyzer has correct trigger mode/level setting, otherwise you see lots of noise floor signal instead of WiFi packets. This is why you see few packet by luck (most of time it is the noise floor signal). Here is a spectrum setting from my side. As you can see I can capture the spectrum steadily. openwifi-spectrum-analyzer

(Above spectrum is with this fix: https://github.com/open-sdr/openwifi/issues/113#issuecomment-950631854 . Even without this fix, you should also see the spectrum if your spectrum analyzer trigger setting is correct)

JiaoXianjun commented 2 years ago

You can debug further by:

  1. Before running the injection program: ./sdrctl dev sdr0 set reg xpu 11 16 ./sdrctl dev sdr0 set reg xpu 1 4294967296 ./sdrctl dev sdr0 set reg drv_tx 7 7

The 1st one turn off ACK TX. The 2nd one turn off RX and CSMA controlling on TX The 3nd one turn on the TX debug message in kernel

  1. Run the packet inject program for 10 or 100 packets
  2. Check the kernel debug message by running: dmesg
brealin commented 2 years ago

When I use ad-hoc mode, I use UDP data to send packets to sdr0, and I can get the correct spectrum on the spectrum analyzer, so my current hardware environment should be no problem. openwifi0

I tried the above operation, but still nothing happens in the injection mode. Openwifi1 openwifi2 openwifi3

brealin commented 2 years ago

It has been verified that the 2.4G frequency WIFI can work normally. The default configuration in the package injection script is 44 channels of 5GHz frequency. The 5GHz signal of my board is too weak to trigger the signal analysis instrument. Thank you JiaoXianjun for your patient reply!

JiaoXianjun commented 2 years ago

Good to know that the issue is not with openwifi. I will close this issue.