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openwifi/doc/app_notes/ad-hoc-two-sdr.md
Jiao Xianjun 3c7c37b50f
Update ad-hoc-two-sdr.md
2021-02-03 15:30:21 +01:00

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  • Power on two SDR boards. Call one board "adhoc1" and the other "adhoc2". On each board, the TX and RX antenna should vertical/orthogonal to each other as much as possible to gain a good TX/RX isolation.

  • Connect a computer to the adhoc1 via Ethernet cable. The computer should have static IP 192.168.10.1. Open a terminal on the computer, and then in the terminal:

    ssh root@192.168.10.122
(password: openwifi)
service network-manager stop
cd openwifi
./wgd.sh
(Wait for the script completed)
ifconfig sdr0 up
./sdr-ad-hoc-up.sh sdr0 44 192.168.13.1
(Above command setup ad-hoc network at channel 44 with static IP assigned to sdr0 NIC)
iwconfig sdr0

  • You shold see output like:

    sdr0    IEEE 802.11  ESSID:"sdr-ad-hoc"  
        Mode:Ad-Hoc  Frequency:5.22 GHz  Cell: 92:CA:14:27:1E:B0   
        Tx-Power=20 dBm   
        Retry short limit:7   RTS thr:off   Fragment thr:off
        Encryption key:off
        Power Management:off

    If you see "Cell: Not-Associated", please wait and run "iwconfig sdr0" again until a randomly generated Cell ID appears.

  • Connect another computer to the adhoc2 via Ethernet cable. The computer should have static IP 192.168.10.1. Open a terminal on the computer, and then in the terminal:

    ssh root@192.168.10.122
(password: openwifi)
service network-manager stop
cd openwifi
./wgd.sh
ifconfig sdr0 up
./sdr-ad-hoc-up.sh sdr0 44 192.168.13.1
iwconfig sdr0

  • You shold see output like:

    sdr0    IEEE 802.11  ESSID:"sdr-ad-hoc"  
        Mode:Ad-Hoc  Frequency:5.22 GHz  Cell: 92:CA:14:27:1E:B0   
        Tx-Power=20 dBm   
        Retry short limit:7   RTS thr:off   Fragment thr:off
        Encryption key:off
        Power Management:off

    The "Cell: 92:CA:14:27:1E:B0" should be the same as adhoc1, because the later joined node should discover the Cell ID of the existing network and join/get it automatically. If not, please adjust the antenna/distance and re-run the commands.

    Now the communication link should be already setup between the two ad-hoc nodes, and you can ping each other.