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Update ap-client-two-sdr.md

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doc/app_notes/ap-client-two-sdr.md
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@ -4,6 +4,8 @@ SPDX-FileCopyrightText: 2019 UGent
SPDX-License-Identifier: AGPL-3.0-or-later
-->
**NOTE** the terminal session mentioned in the following text can also be setup via USB-UART instead of Ethernet.
- 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:
```
@ -28,17 +30,30 @@ SPDX-License-Identifier: AGPL-3.0-or-later
ifconfig sdr0 up
iwlist sdr0 scan
(The "openwifi" AP should be listed in the scanning results)
iwconfig sdr0 essid openwifi
wpa_supplicant -i sdr0 -c wpa-openwifi.conf
```
- Now the client is trying to associate with the AP. The AP board terminal should print like:
If wpa-openwifi.conf is not on board, please create it with [this content](https://github.com/open-sdr/openwifi/blob/master/user_space/wpa-openwifi.conf).
- 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: AP-STA-CONNECTED 66:55:44:33:22:58
sdr0: STA 66:55:44:33:22:58 RADIUS: starting accounting session 1FF1C1B4-00000001
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 the terminal of client:
- 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)