OpenFrameworks: Another cool Multi-platform Framework for Graphics

Steps to download and build OpenFrameWorks:

• git clone https://github.com/openframeworks/openFrameworks.git
• goto the OF root.  This is usually the folder openFrameworks.  Change directory to ./scripts/linux/ubuntu (e.g: cd openFrameworks/scripts/linux/ubuntu)

• Execute the scripts in the folder as root:

sudo ./install_dependencies.sh

sudo ./install_codecs.sh

Go to ./scripts/linux and execute:

./compileOF.sh
./compilePG.sh

To generate projects (Makefile etc.)  for all the examples, goto OF root, then type:

projectGenerator -v -r examples/

wxWidgets 3.0

To add the repository, first import the key:

sudo apt-key adv --fetch-keys http://repos.codelite.org/CodeLite.asc

Then add the source:

sudo tee /etc/apt/sources.list.d/wxwidgets.list
deb http://repos.codelite.org/wx3.0.2/ubuntu/  $(lsb_release -sc) universe
sudo apt-get update

Install wxWidgets modules:

sudo apt-get install libwxbase3.0-0-unofficial libwxbase3.0-dbg libwxbase3.0-dev libwxgtk3.0-0-unofficial libwxgtk3.0-dbg wx3.0-doc wx3.0-examples 

Create soft-link:

sudo ln -s /usr/include/wx-3.0-unofficial/wx /usr/include/wx 

To compile a single file, create a script named wxcompile and edit it with the content as below (assume with have subdirectory obj/Debug and bin/Debug:

#!/bin/bash

if [ -z "${1}" ]
then
    echo "$0 "
    exit 1
fi

FILE=`basename $1`
CPPF=$FILE
OBJF=`basename -s .cpp $CPPF`
OBJF=${OBJF}.o
g++ -g -c -Wall -DWX_PRECOMP -Winvalid-pch `wx-config --cppflags` -o obj/Debug/${OBJF} ${CPPF}

To link, create a script file name 'wxlink' and its content as below:

#!/bin/bash

if [ -z "${1}" ]
then
    echo "$0 "
    exit 1
fi

FOUT=$1
OBJF=obj/Debug/*.o

g++ -v obj/Debug/*.o `wx-config --libs` -o obj/Debug/$FOUT

For a bigger project which requires more complicated and conditional compilation, use Makefile.

Watching Nabawi-TV via VLC on Raspberry Pi

A new Indonesian da'wah TV has provided a streaming.

To watch, install vlc.  Once installed, open the VLC, click "Media", and then "Open Network Stream".  Enter:

rtsp://wowza60.indostreamserver.com:1935/nabawitv/live

Script to simulate multiple DHCP clients

#!/bin/sh

#simulate 255 IPhones requesting DHCP

 

 

# Apple OUI = D8:96:95

BASE="d8:96:95:08:96"

FROM=$1

shift

TO=$2

 

if [ -e $FROM ]; then FROM=1; fi

if [ -e $TO ]; then TO=1; fi

 

for i in `seq $FROM $TO`

do

    LSB=`echo "obase=16; $i" | bc`

    MAC="$BASE:$LSB"

    HNAME="`uname -n`-fakehost-$i"

    #CMD="$HOME/bin/dhtest -m $MAC -V -i eth1 -h '$HNAME'"

    CMD="$HOME/bin/dhtest -m $MAC -i eth1 -h '$HNAME'"

    echo $CMD

    $CMD

    sleep 1

done

Another way, the program dhtest (source code) can be download from  https://github.com/saravana815/dhtest.  

For example:

 

git clone https://github.com/saravana815/dhtest

cd dhtest

make

Daily backup of local git changes

While working on a ticket and not ready to commit, it's a good idea to backup all of our changes to an archive file.

The following script does all that and executed daily by cronjob automatically.

1. create a file, say "backup" in /etc/cron.daily
2. Type the following (change '<yourhome directory>' to your own login name and <git location> to the git directory where source codes are located):

backing up changed files to tarball

#!/bin/sh pushd <your source-code location> LIST=`git status --porcelain | sed -n -e '/^ [D|M]/p' | sed -e 's/^ [D|M] //'` backupname=`git branch | sed -n -e "/^* /p" | sed  -e 's/** //'` backupname=$backupname-`date "+%s"`.backup.tar.bz2 dest='<your home directory>' if [ ! -d "$dest" ] then     mkdir -p $dest fi tar jcvf $dest/$backupname $LIST > /dev/null

Make the file executable:

chmod +x /etc/cron.daily/backup

Block Access during certain period using EBTABLES

Say, we want to block any packets coming from a device with mac address 00:01:02:03:04:05 (in other words, our router/switch should just silently drop any packets coming from this MAC address) during period of time 00:00 (00:00 AM) to 6:00 AM, do:

#ebtables -A INPUT -s 00:01:02:03:04:05  --timestart 0:0 --timestop 06:00 -j DROP

If we just want to drop IPv4 packets for the above:

#ebtables -A INPUT -p IPv4 -s 00:01:02:03:04:05  --timestart 0:0 --timestop 06:00 -j DROP

So, parameters for ebtables are actually similar (yet subset) of iptables (netfilter).

To fix Mute button keyboard shortcut issue on LXDE

Create a script call "amixertoggle" and save it in /usr/local/bin:

#!/bin/bash

amixer $1 sset Headphone toggle
amixer $1 sset Speaker toggle
amixer $1 sset PCM toggle
amixer $1 sset Master toggle



Edit file $HOME/.config/openbox/lxde-rc.xml and replace block that has "XF86AudioMute" to call our script.  For example:

...
...

    <keybind key="XF86AudioMute">
      <action name="Execute">
              <command>amixertoggle -c 1 toggle</command>
      </action>

...
...

(" -c 1" above is for machine, where the mixer control is actually on card 1.  If doesn't work, we can try different number)

Reload the modified file lxde-rc.xml by doing:

openbox --reconfigure

That's it.  Everytime we press "Mute" button on our PC keyboard, the mute/unmute will toggle.

Raspberry Pi 2

Got this New Raspberry Pi 2 I ordered a few weeks ago.  It's significantly faster than the first version.  I only wish it had USB 3.0 ports so I can have much bigger and faster storage.