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ap-client-two-sdr.md

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NOTE the terminal session mentioned in the following text can also be setup via USB-UART instead of Ethernet.

NOTE adrv9361z7035 has ultra low TX power in 5GHz. Move CLOSER when you use that board in 5GHz!!!

  • Power on two SDR boards. Call one board "AP board" and the other "client board". 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 AP board 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)
cd openwifi
./fosdem.sh
(It will create a WiFi AP by hostapd program with config file: hostapd-openwifi.conf)
(Wait for the script completed)
cat /proc/interrupts
(Execute the "cat ..." command for several times)
(You should see the number of "sdr,tx_itrpt1" grows, because it sends the "openwifi" beacon periodically)

  • Connect another computer to the client board 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
iwlist sdr0 scan
(The "openwifi" AP should be listed in the scanning results)
wpa_supplicant -i sdr0 -c wpa-openwifi.conf
("iwconfig sdr0 essid openwifi" could also work. Less info compared to wpa_supplicant)

    If wpa-openwifi.conf is not on board, please create it with this content.

  • Now the client is trying to associate with the AP. You should see like:

    root@analog:~/openwifi# wpa_supplicant -i sdr0 -c wpa-openwifi.conf 
Successfully initialized wpa_supplicant
sdr0: CTRL-EVENT-SCAN-STARTED 
sdr0: SME: Trying to authenticate with 66:55:44:33:22:8c (SSID='openwifi' freq=5220 MHz)
sdr0: Trying to associate with 66:55:44:33:22:8c (SSID='openwifi' freq=5220 MHz)
sdr0: Associated with 66:55:44:33:22:8c
sdr0: CTRL-EVENT-CONNECTED - Connection to 66:55:44:33:22:8c completed [id=0 id_str=]

    The AP board terminal should print like:

    ...
sdr0: STA 66:55:44:33:22:4c IEEE 802.11: authenticated
sdr0: STA 66:55:44:33:22:4c IEEE 802.11: associated (aid 1)
sdr0: AP-STA-CONNECTED 66:55:44:33:22:4c
sdr0: STA 66:55:44:33:22:4c RADIUS: starting accounting session 613E16DE-00000000

    If not, please adjust antenna/distance and re-run the commands on the client side.

  • After association is done, in another terminal of client (DO NOT terminate wpa_supplicant in the original client terminal!):

    dhclient sdr0
(Wait for it completed)
ifconfig sdr0
(Now you should see the IP address like 192.168.13.x allocated by AP)
ping 192.168.13.1
(Ping the AP)

    Now the communication link should be already setup between the AP and the client.