[2024-feb-29] Sad news: Eric Layton aka Nocturnal Slacker aka vtel57 passed away on Feb 26th, shortly after hospitalization. He was one of our Wiki's most prominent admins. He will be missed.

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howtos:hardware:arm:raspberrypi3_wap [2018/08/26 20:55 (UTC)] – [Hardware Requirements] bifferoshowtos:hardware:arm:raspberrypi3_wap [2018/08/28 20:05 (UTC)] – [QR Codes] bifferos
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   * A Raspberry Pi 3 running Slackware 14.2   * A Raspberry Pi 3 running Slackware 14.2
-  * A powered USB hub with 2A Power supply (to ensure the Wifi Dongle gets enough juice)+  * A powered USB hub with 2A Power supply (to ensure the Wifi adapter gets enough juice)
   * Alfa Network AWUS036NHA - USB WiFi Adapter with chipset ar9271l   * Alfa Network AWUS036NHA - USB WiFi Adapter with chipset ar9271l
   * Ethernet cable   * Ethernet cable
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 ===== Adapter detection ===== ===== Adapter detection =====
 +
 +<note>
 +I advise to not connect and disconnect the hub from the Pi while it's running.  Instead, power it up with hub connected (and powered) and then connect and disconnect the Wifi adapter as needed.
 +</note>
  
 Ensure that iwconfig shows two adapters wlan0 and wlan1.  wlan0 is the built-in one on the Pi.  If dmesg isn't showing the Alpha one has been plugged in, then just un-plug it and plug it in again.  Bring the Adapter up with: Ensure that iwconfig shows two adapters wlan0 and wlan1.  wlan0 is the built-in one on the Pi.  If dmesg isn't showing the Alpha one has been plugged in, then just un-plug it and plug it in again.  Bring the Adapter up with:
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 <code># Example of how to configure a bridge:</code> <code># Example of how to configure a bridge:</code>
  
-Ensure the following appears so a bridge will be created:+Ensure the following appears so a bridge will be created (adjust DHCP_HOSTNAME to suit):
  
 <code>IFNAME[0]="br0" <code>IFNAME[0]="br0"
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 auth_algs=1</code> auth_algs=1</code>
  
-What this does:  The interface wlan1, we've seen before.  The bridge br0 will get wlan1 interface added to it when hostapd has fired up.  The syslog logging lines ensure you get something in /var/log/messages to tell you what's going on.  The ssid, wpa and wpa_passphrase settings should be rather obvious, the hw_mode you can just leave as 'g' unless you know what you're doing, channel is set to something you didn't see when you ran 'iwlist wlan1 scanning' earlier on.+What this does:  The interface wlan1, we've seen before.  The bridge br0 will get wlan1 interface added to it when hostapd has fired up.  The syslog logging lines ensure you get something in /var/log/messages to tell you what's going on.  The ssid, wpa and wpa_passphrase settings should be rather obvious, the hw_mode you can just leave as 'g' unless you know what you're doing, channel is set to something you didn't see when you ran ''iwlist wlan1 scanning'' earlier on.
  
 That minimal config should get hostapd working fine, at least it did for me. That minimal config should get hostapd working fine, at least it did for me.
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 <code># chmod 755 /etc/rc.d/rc.hostapd</code> <code># chmod 755 /etc/rc.d/rc.hostapd</code>
  
 +===== QR Codes =====
 +
 +{{ howtos:hardware:arm:hostapd.png?100 }}
 +
 +No home WiFi network setup is complete without a QR code that you can wave at all your mates when they are round your house wanting to connect.  You can create one of these from your WiFi settings using the **qrencode** program, available from [[https://slackbuilds.org/repository/14.2/graphics/qrencode/|Slackbuilds]], or alternatively, get the build from [[http://www.slackware.com/~alien/slackbuilds/qrencode/build/|Alien Bob]] for a slightly later version.
 +
 +Type the following to create a PNG file with the code, which you can print, copy to your mobile, put on a local webpage or whatever.
 +
 +<code># qrencode -t PNG -o wifi-setup.png "WIFI:S:MYSSID;T:WPA2;P:MYPASSWD;H:true;"</code>
 +
 +The above assumes WPA2, MYSSID should be replaced with your SSID, MYPASSWD replaced with your password.  For my Android phone I installed a piece of software from the Play store called [[https://play.google.com/store/apps/details?id=com.google.zxing.client.android|Barcode Scanner]] by the [[https://play.google.com/store/apps/developer?id=ZXing+Team|ZXing Team]].  It works very well for reading these codes.
 +
 +At a pinch, the following bash script should pull your SSID and passphrase out of the hostapd.conf file, and automatically use them to create a new QR code, so you can quickly keep it up to date after any changes.
 +
 +<code>#!/bin/sh
 +
 +SSID=$(cat /etc/hostapd/hostapd.conf | grep ^ssid= | cut -d= -f2)
 +PASS=$(cat /etc/hostapd/hostapd.conf | grep ^wpa_passphrase= | cut -d= -f2)
 +
 +qrencode -t PNG -o hostapd.png "WIFI:S:$SSID;T:WPA2;P:$PASS;H:true;"</code>
 +
 + 
 ===== Conclusion ===== ===== Conclusion =====
  

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