1- 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. 2- 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: 3 ``` 4 ssh [email protected] 5 (password: openwifi) 6 cd openwifi 7 ./fosdem.sh 8 (It will create a WiFi AP by hostapd program with config file: hostapd-openwifi.conf) 9 (Wait for the script completed) 10 cat /proc/interrupts 11 (Execute the "cat ..." command for several times) 12 (You should see the number of "sdr,tx_itrpt1" grows, because it sends the "openwifi" beacon periodically) 13 ``` 14- 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: 15 ``` 16 ssh [email protected] 17 (password: openwifi) 18 service network-manager stop 19 cd openwifi 20 ./wgd.sh 21 (Wait for the script completed) 22 ifconfig sdr0 up 23 iwlist sdr0 scan 24 (The "openwifi" AP should be listed in the scanning results) 25 iwconfig sdr0 essid openwifi 26 ``` 27- Now the client is trying to associate with the AP. The AP board terminal should print like: 28 ``` 29 ... 30 sdr0: AP-STA-CONNECTED 66:55:44:33:22:58 31 sdr0: STA 66:55:44:33:22:58 RADIUS: starting accounting session 1FF1C1B4-00000001 32 ``` 33 If not, please adjust antenna/distance and re-run the commands on the client side. 34 35- After association is done, in the terminal of client: 36 ``` 37 dhclient sdr0 38 (Wait for it completed) 39 ifconfig sdr0 40 (Now you should see the IP address like 192.168.13.x allocated by AP) 41 ./set_csma_normal.sh 42 ping 192.168.13.1 43 (Ping the AP) 44 ``` 45 Now the communication link should be already setup between the AP and the client. 46