|Channel||Center Frequency (GHz)|
each having a 22 MHz channel width
Computing information, plain and simple!
It is possible to record a terminal session under Linux with ttyrec. It also records vi, emacs, etc. sessions.
Fisrt, install ttyrec
sudo apt-get install ttyrec
To start recording a session:
To replay a session recording:
A lot of people is having problem setting up a Bluetooth keyboard and mouse on the Raspberry PI. Things get more complicated when your wired keyboard or mouse does not work or prevent your Bluetooth dongle from working. There is hope. This step by step procedure will let you install them or at a minimum let you know what does not work. It uses only the command line interface. It is targeted for the Wheezy Debian distribution.
apt-get update apt-get upgrade
update-rc.d -f dbus defaults
apt-get install bluetooth bluez-utils blueman
bluez-simple-agent hci0 75:EF:82:69:D2:83
bluez-test-device trusted 75:EF:82:69:D2:83 yes
bluez-test-input connect 75:EF:82:69:D2:83
This procedure worked for the following devices:
You can initialize your Raspberry PI wireless connection automatically at boot time if the instructions given in a previous post entitled How To Setup A Protected Wireless Connection Via The Command-Line worked. This is pretty straight forward. You must be root to carry out these instructions.
Save the wpa.conf file created in the previous post somewhere on the SD card you use to boot the system. For example in /root/bin/wpa.conf.
Create the following script and save it in a file called /root/bin/initWiFi for example
#!/bin/bash /sbin/wpa_supplicant -Dwext -iwlan0 -cwpa.conf -B /sbin/dhclient wlan0
Protect the files
chmod 700 /root/bin/initWiFi chmod 600 /root/bin/wpa.conf
Add to the file /etc/rc.local before the last exit statement the following line
Setting up a wireless connection via the command line may vary depending on the USB Wireless Interface you are using. These instructions also work for the Raspberry PI running Wheezy. You must be root in order to carry out these instructions.
Make sure that your wireless interface is recognized.
Find your wireless interface name (usually wlan0).
Make sure that your network is visible asssuming the ESSID is broadcasted. Replace wlan0 by you wireless interface name.
iwlist wlan0 scan
iwlist wlan0 scan | grep ESSID
Prepare your wireless configuration file. It will wait for you to type in your wireless network password. Enter your wireless network password an hit ENTER.
wpa_passphrase Replace-with-your-ESSID > wpa.conf
Find out which wireless driver you are using. The drivers are listed in the drivers section. The driver you are using is usually labelled “Linux wireless extensions”. The driver name is most of the time wext.
Initialize the wireless interface. Make sure you replace wpa.conf, wext and wlan0 with the values related to your environment. Some error messages may be displayed. These errors might not prevent your wireless connection from working.
wpa_supplicant -Dwext -iwlan0 -cwpa.conf -B
You can check if your wireless interface is properly initialized.
Issue this command to get an IP address assuming you are using DHCP.
You can install wpa_passphrase and wpa_supplicant is they are not already on your system by issuing the command
apt-get install wpasupplicant