Need help in generating wifi Becons using HackRF (wifi_tx.grc)

[ShivaAlethea]

Hi, Im new to this GNU Radio. Can anyone please help me to create .grc for Beacon geneartion (using HackRF One). I tried to ran wifi_tx.grc, It is working. But it is not generating any Beacons.

Also tried to follow https://user-images.githubusercontent.com/77594215/106764041-59bd3400-662f-11eb-8a87-994884fa0361.png

But im not able to get the values that i need to pass on header_formatter, Packet_Header, OFDM_carrier_Allocator and FFT.

Can anyone help me to create this/new .grc for beacon generation.

Thank you

[bastibl]

From the screenshot I only see that something is red, so something goes wrong. the error is not on the screenshot, so I can only guess:

• make sure you use the correct version/branch of this module as indicated in the readme
• check cmake output, if something is missing and, therefore, stuff is not built
• make sure the paths are correctly set up as indicated in the readme

See this blog post and this talk and slides for how to inject frames.

[ShivaAlethea]

Hi @bastibl Thank you very much for the reply. With the help of above blog post created beaconFrameGeneration.py and wifi_beacon_tx.grc wifi_tx.zip

Running wifi_beacon_tx.grc is not giving any error, But still I'm not able to see the Beacons. Im i missing anything here, please help.

Beacon frame generation using scapy:

GNU radio .grc (please find the attached zip for .grc file)

[ShivaAlethea]

@bastibl Also tried the first scenario, No errors now. Need a info >> on FFT >> Window (formula something like>> tuple(1/52**0.1.....)) wifi_tx_1.zip

[ShivaAlethea]

Hi @bastibl, Tried to follow https://github.com/bastibl/gr-ieee802-11/issues/236 and observed below.

• If i try to capture PCAPs directly from the Socket PDU, It is working fine and I'm able to see some Beacons.
• But the same is not working with WiFi PHY Hier, No packets are captured.

PCAP With >> Socket PDU - Working

PCAP With >> WiFi PHY Hier - Not working

[bastibl]

I already replied to the last post in the other issue.

The frequency that you are using (5.89GHz is not a WiFi channel but for vehicular networking, i.e., a normal device will not search there). Please try changing to a 11g or 11a channel.

Not sure about your issue with the FFT window. You shouldn't have to change it, if you use the correct version of the module, i.e., make sure that you use the branch of this module that fits your GNU Radio version.

[ShivaAlethea]

@bastibl Thanks for the support. It started working fine after HackRF Firmware update. Now im able to see my SSID's in laptop.

[ShivaAlethea]

@bastibl Need one more clarification, Is it possible to send multiple beacons from different ports and frequencies ? Something Like:

Trying to run this test is giving : RuntimeError: resolve_port: hierarchical block 'sink_impl': input 1 is not connected internally

File "/home/alethea/shiva/HackRF/gr-ieee802-11/examples/playback_test.py", line 200, in <module>
    main()
  File "/home/alethea/shiva/HackRF/gr-ieee802-11/examples/playback_test.py", line 180, in main
    tb.start()
  File "/usr/lib/python3/dist-packages/gnuradio/gr/top_block.py", line 116, in start
    top_block_start_unlocked(self._impl, max_noutput_items)
RuntimeError: resolve_port: hierarchical block 'sink_impl': input 1 is not connected internally

Anything else needs to be taken care here?

[bastibl]

This not possible with the HackRF.

[ShivaAlethea]

@bastibl Thank you very much for your support. Closing this issue as it started working for me after firmware update.