Projet Buildroot : follow crow movement

This projet use the movement data of a population of crow from Paris region using moveBank.org. Every hour, new data are retrieve and a new PNG file is created for each individual. It aim to see the live movement of this population of crow.

Installation Utilisation

Installation

Clone

git clone https://github.com/valpaz/projetBuildroot.git

C++ library dependance:
-Cmake (cmake)
-curl (libcurl4-openssl-dev)
-cryptopp (libcrypto++-dev)
-libGD (libgd-dev)
-cron

Utilisation

- On your linux :

First you need to compile :

mkdir build
cd build
cmake ..
make

Now :

./launcher
./updateEvent (when you want to update your data)
./graph (when you want to retrieve new graph from your data)

- On your embedded machine : (here an exemple with a virtual ARM64 architecture (with Qemu) build with buildroot)

First you need to compile :

In the CMakeLists.txt, you need to set the path to your specific compileur. In this exemple :
set(CMAKE_CXX_COMPILER /path/to/buildroot-2023.08/output/host/bin/aarch64-buildroot-linux-gnu-g++)

mkdir build
cd build
cmake ..
make

Setting up your modified file system :
In your buildroot folder :

mkdir overlay

Setting up your user :
in buildroot folder, do :

mkdir myConfig;cd myConfig
touch users.txt

Here you need to add the user you want to create for your machine.
For exemple :
username 1000 username 1000 =password /home/username /bin/sh -Raspberry Pi User
with this done, do :

make xconfig

Search BR2_ROOTFS_USERS_TABLES and add the path to users.txt.
Now in your overlay folder :

mkdir home;cd home;mkdir username

copying your executables to your username folder

cp graph launcher updateEvent ~/your/buildroot/overlay/home/username/
cp map.png ~/your/buildroot/overlay/home/username/

Setting up cron
Next, you need to add cron so that it can update data every hour and create new graph.
First, in your overlay folder :

mkdir etc;cd etc;mkdir init.d;cd init.d
touch S80Cron

And add :
#!/bin/sh
/usr/sbin/crond

Now,

mkdir var;cd var;mkdir spool;cd spool;mkdir cron;cd cron;mkdir crontabs

Here you need to create a file named by the username you just create and will log in with. So in crontabs folder :

touch user
In the file, add this :
0 * * * * /your/home/path/updateEvent
0 * * * * /your/home/path/graph
This will make your updateEvent and graph execute every hours.

And you are done.
Now in your embedded machine, you just have to launch ./launcher one time from your HOME folder and the cron will launch both updateEvent and graph every hours. The data are stored in moveBankProjet folder. You will just have to retrieve the .png using ssh for exemple.

Note : If you use a virtual machine, you could need to add some RAM in your start-Qemu file : -m 512