Wireless on PogoPlug

###Hardware Preparation Insert the usb wireless card and view the dmesg information:

	$ dmesg | tail
	[911884.740000] usb 1-1.3: USB disconnect, device number 4
	[911897.530000] usb 1-1.4: new high speed USB device number 5 using oxnas-ehci
	[911897.640000] usb 1-1.4: New USB device found, idVendor=0bda, idProduct=8179
	[911897.640000] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
	[911897.650000] usb 1-1.4: Product: 802.11n NIC
	[911897.650000] usb 1-1.4: Manufacturer: Realtek
	[911897.660000] usb 1-1.4: SerialNumber: 00E04C0001
The model is Mercury FW150US, See details of the lsusb
	$ lsusb -v -d 0bda:8179
	Bus 001 Device 005: ID 0bda:8179 Realtek Semiconductor Corp. 
	......

But the output didn’t show its information, we google it, knows:
只是一个8176和8179之分，后来才知道原来这款瑞昱的芯片有两个版本，8176对应的是rtl8192cu，8179对应的是rtl8188eu。
8179 is the rtl8188eu, so we need to find rtl8188eu device driver.
###Driver Preparation Prepare the cross-compiler, download “gcc-linaro-arm-linux-gnueabi-2012.02-20120222_linux.tar.bz2”, uncompress it and add it into your system path.
Prepare the Linux source code, named “linux-3.1.10.pogoplug.tar.bz2”, uncompress it.
How do we get the cross-compiler version?

	$ cat /proc/version
	Linux version 3.1.10 (lintel@lintel-ThinkPad-T430) (gcc version 4.6.3 20120201 (prerelease) (Linaro GCC 4.6-2012.02) ) #10 SMP PREEMPT Fri Jun 7 19:14:08 CST 2013

From the result, we know the cross-compiler is 4.6.3 version.
Download the corresponding cross-compiler and add it to the sytem path. Then we download the PogoPlug Linux Source, uncompress it and also get the rtl8188eu from https://github.com/Red54/linux-shumeipai2/tree/sunxi-3.0/drivers/net/wireless/rtl8188eu, copy the rtl8188eu’s driver under driver/net/wireless, then modify the Kconfig file:

	\+source "drivers/net/wireless/rtl8192cu/Kconfig"
	source "drivers/net/wireless/rtl8188eu/Kconfig"

and also the Makefile:

	obj-$(CONFIG_RTL8192CU)  += rtl8192cu/
	\+obj-$(CONFIG_RTL8188EU)  += rtl8188eu/
	obj-$(CONFIG_IPW2100) += ipw2x00/
	obj-$(CONFIG_IPW2200) += ipw2x00/

Then, we get the running kernel’s configuration file via:

	cat /proc/config.gz | gunzip >running.config

upload the configuration file to the directory of the kernel source, then

	$ export ARCH=arm
	$ export CROSS_COMPILE=arm-linux-gnueabi-
	$ make  ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- menuconfig
	in menuconfig, load the running.config, then navigate to driver->net->wireless, choose rtl8188eu's driver, compile it to kernel
	$ make  ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
	$ sudo yaourt mkimage
	Install mkimage, then go to arch/arm/boot
	$ mkimage -n 'linux-3.1.10' -A arm -O linux -T kernel -C none -a 0x60008000 -e 0x60008000 -d zImage uImage

upload the generated uImage to pogoplug, then we have to update the kernel image into our own image

	# Install mtd-utils first
	$ apt-get install mtd-utils
	# Erase the mtd partition which contains existing kernel
	$ /usr/sbin/flash_erase /dev/mtd1 0xB00000 22
	# Write newly generated uImage into the mtd partition
	$ /usr/sbin/nandwrite -p -s 0xB00000 /dev/mtd1 /root/uImage	

Reboot the pogoplug. ###Wireless Configuration On pogoplug, install following software:

	$ apt-get install iw wireless-tools 

Use wpa_supplicant to generate the configuraiton file and generate the password

	wpa_supplicant -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf
	wpa_passphrase NETGEAR79 xxxxxx > /etc/wpa_supplicant/NETGEAR79.conf

With the generated file we can directly connect to the exisint wireless network.
Then we have to update the network configration file,

	$ vim /etc/network/interfaces
	auto lo eth0
	iface lo inet loopback
	iface eth0 inet dhcp
	
	auto wlan0
	allow-hotplug wlan0
	iface wlan0 inet dhcp
	wpa-conf /etc/wpa_supplicant/NETGEAR79.conf

After everything is done, we can remove the wired connection, and change the wired-bind ip address to wireless binded ip address, everything will be the same as before. But the bootup may be 1 or 2 seconds than the wired connection.

Use Xapian for creating a local search engine

###Install Xapian-core Xapian-core is the Xapian library itself. We have to install it from source-code

	$ wget http://oligarchy.co.uk/xapian/1.2.15/xapian-core-1.2.15.tar.gz
	$ tar xzvf xapian-core-1.2.15.tar.gz && cd xapian-core-1.2.15/
	$ ./configure --prefix=/usr/local && make && make install

###Install Omega Omega utilities is an application built on Xapianm, consisting of indexers and a CGI search frontend.

	$ wget http://oligarchy.co.uk/xapian/1.3.1/xapian-omega-1.3.1.tar.gz
	$ tar xzvf xapian-omega-1.3.1.tar.gz &&  cd xapian-omega-1.3.1/
	$ ./configure --prefix=/usr/local && make && make install

###Configure the CGI for apache Change the “ScriptAlias /cgi-bin/ “/usr/lib/cgi-bin/"", so the httpd knows cgi binaries is put in the /usr/lib/cgi-bin directory. Then we have to copy the omega library to the /usr/lib/cgi-bin/:

	$ cd xapian-omega-1.3.1/
	$ cp omega /usr/lib/cgi-bin/omega.cgi
	$ cp omega.conf /usr/lib/cgi-bin/
	$ chmod 755 /usr/lib/cgi-bin/omega.cgi

The Configuration file /usr/lib/cgi-bin/omega.conf should looks like this:

	database_dir /var/lib/omega/data
	template_dir /var/lib/omega/templates
	log_dir /var/log/omega
	cdb_dir /var/lib/omega/cdb

Copy the templates to the new directory:

	$ cd xapian-omega-1.3.1/
	$ cp -ar /templates/* /var/lib/omega/templates/
	$ mkdir -p /var/lib/omega/data/default
	$ chmod -R 644 /var/lib/omega/data/default

Generate the database file:

	$ sudo /usr/local/bin/omindex --db /var/lib/omega/data/default --url / /home/Trusty/code/octo/debian_octopress/public/

###Result Restart the httpd daemon:

	$ systemctl restart httpd

Browser http://localhost/cgi-bin/omega.cgi you will see the following picture:

Using wicd with Awesome

###Install packages Install the following packages

	$ sudo pacman -S wicd
	$ sudo pacman -S wicd-gtk
	$ sudo pacman -S notification-daemon
	$ sudo pacman -S python2-notify

###Configure Add your account to users group

	# gpasswd -a USERNAME users

Start Wicd as System Service:

	$ systemctl start wicd.service

Automatically start service at boot-up:

	$ systemctl enable wicd.service

Add the wicd-client as tray in the rc.lua file

	$ wicd-client --tray

Run mini_snmpd on OpenWRT

###OpenWRT Configuration Install mini_snmpd:

	$ opkg update
	$ opkg install mini-snmpd

Configure mini_snmpd: mainly changes: option enabled 1, then change the option contact and location. But infact we can only fetch list interfaces in cacti:

	root@OpenWrt:~# cat /etc/config/mini_snmpd 
	config mini_snmpd
		option enabled 1
		option ipv6 0
		option community 'public'
		option contact 'gwoguowug@gmail.com'
		option location 'Asia/China/Nanjing'
	
		# enable basic disk usage statistics on specified mountpoint
		list disks '/jffs'
		list disks '/tmp'
	
		# enable basic network statistics on specified interface
		# 4 interfaces maximum, as named in /etc/config/network
		list interfaces 'loopback'
		list interfaces 'lan'
		list interfaces 'wan'

Restart the mini_snmpd:

	$ /etc/init.d/mini_snmpd restart

###Cacti Configuration Add a new device named OpenWRT, the configuration may like following:

	Change the Host Template to Generic SNMP-enabled Host
	Downed Device Detection - Ping
	Ping Method - ICMP Ping

Then you can add your own data sources, graph templates, new graph, new graph Trees, then display them. the picture may looks like as following:

Add optional data into snmpd

###Prepare the script We get the current system load from /proc/loadavg:

	[Trusty@XXXyyy ~]$ cat /bin/online.sh
	#!/bin/sh
	echo .1.3.6.1.4.1.102.8
	cat /proc/loadavg | awk {'print $1'}

Then we have to add this script to our /etc/snmp/snmpd.conf:

	extend .1.3.6.1.4.1.2021.53 online_monitor /bin/sh /bin/online.sh

Restart the service:

	systemctl restart snmpd

Use snmpwalk to view the newly added item:

	snmpwalk -v 2c -c public 10.0.0.221 .1.3.6.1.4.1.2021.53

###Fetch the data See the following data is what we want:

	root@ubuntu:/etc# snmpwalk -v 2c -c public 10.0.0.221 .1.3.6.1.4.1.2021.53.4.1.2.14.111.110.108.105.110.101.95.109.111.110.105.116.111.114.2
	iso.3.6.1.4.1.2021.53.4.1.2.14.111.110.108.105.110.101.95.109.111.110.105.116.111.114.2 = STRING: "0.77"

###Draw images in cacti First, add a data templates:
Console->Data Templates->Add,
Data Template Name: MonitorArchCustomized
Data Source Name: |host_description|-MonitorArchCustomized
Data Input Method: Get SNMP Data
Associated RRA’s: Hourly(1 Minutes Average)
Internal Data Source Name: MonitorArchCustom
Then click “Create”
some additional field will be displayed, in the newly field “Custom Data [data input: Get SNMP Data]” insert the OID field with “.1.3.6.1.4.1.2021.53.4.1.2.14.111.110.108.105.110.101.95.109.111.110.105.116.111.114.1”(which you got from the snmpwalk output result)

Second, add a graph templates:
Templat Name: MonitorArchCustomized
Graph template Title: |host_description|-MonitorArchCustomized
Create and then insert the Graph Template Items, add like following:

	Graph Item 	Data Source 	Graph Item Type 	CF Type 	Item Color
	Item # 1 	(MonitorArchCustom): 	AREA 	AVERAGE 	  	FF00FF 	Move Down Move Up 	Delete
	Item # 2 	(MonitorArchCustom): 	GPRINT 	LAST 	  	F5F800 	Move Down Move Up 	Delete
	Item # 3 	(MonitorArchCustom): Average 	GPRINT 	AVERAGE 	  	8D85F3 	Move Down Move Up 	Delete
	Item # 4 	(MonitorArchCustom): MAX 	GPRINT 	MAX 	  	005D57 	Move Down Move Up 	Delete

Also notice the Data Source should be MonitorArchCustom.

Third, add a new graph under Host of ArchLinux.
Select the Graph template and then click Create.

After some minutes, you will see the newly captured data and the images under graphs-> Arch-> Host:ArchLinux. Maybe Your graphs trees are not the same as mine, you got found your own location.