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add app note: Communication between two SDR boards under ad-hoc mode

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Xianjun Jiao 2020-09-06 16:49:04 +02:00
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README.md
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**openwifi:** Linux mac80211 compatible full-stack IEEE802.11/Wi-Fi design based on SDR (Software Defined Radio).
This repository includes Linux driver and software. [openwifi-hw](https://github.com/open-sdr/openwifi-hw) repository has the FPGA design. [[Project document](https://github.com/open-sdr/openwifi/tree/master/doc)]
This repository includes Linux driver and software. [openwifi-hw](https://github.com/open-sdr/openwifi-hw) repository has the FPGA design. [[Quick start](#Quick-start)], [[Project document](https://github.com/open-sdr/openwifi/tree/master/doc)], [[Application notes](doc/app_notes/README.md)]
[[Videos](#Videos)] [[Papers](#Papers)] [openwifi [maillist](https://lists.ugent.be/wws/subscribe/openwifi)] [[Cite openwifi project](#Cite-openwifi-project)]
@ -54,6 +54,8 @@ zcu102_9371|Xilinx ZCU102 dev board + ADRV9371|Future|None
[[Build openwifi Linux img from scratch](#Build-openwifi-Linux-img-from-scratch)]
[[Special note for 11b](#Special-note-for-11b)]
[[Porting guide](#Porting-guide)]
[[Project document](https://github.com/open-sdr/openwifi/tree/master/doc)]
[[Application notes](doc/app_notes/README.md)]
## Quick start
- Burn openwifi board specific img file (from the table) into a SD card ("Open With Disk Image Writer". Or "dd" command after unzip). The SD card has two partitions: BOOT and rootfs. You need to config the **correct files in the BOOT partition** according to the **board you have** by operation on your computer:

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doc/app_notes/ad-hoc-two-sdr.md
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- To be done.
- Tobe done
- 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.