====== Raspberry PI ======

===== V4l camera module =====

Créer un fichier ''/etc/modules-load.d/camera.conf'' et ajouter la ligne:
  bcm2835-v4l2

===== Video streaming depuis la caméra =====

sur le rpi
<code bash>
/opt/vc/bin/raspivid -o - -t 0 -w 1280 -h 720 -fps 25|cvlc -vvv stream:///dev/stdin --sout '#standard{access=http,mux=ts,dst=:8090}' :demux=h264
</code>

sur VLC
Ouvrir le flux réseau http://alarmpi_wifi:8090

===== wpa_supplicant =====

(ça s'applique à Arch Linux)

créer le fichier ''/etc/wpa_supplicant/wpa_supplicant.conf''
<file ini /etc/wpa_supplicant/wpa_supplicant.conf>
ctrl_interface=/run/wpa_supplicant
update_config=1
</file>

Après, exécuter les commandes suivantes
<code bash>
sudo wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf 
sudo wpa_cli
</code>

Et ensuite dans le prompt:
<code>
> scan
OK
<3>CTRL-EVENT-SCAN-STARTED 
<3>CTRL-EVENT-SCAN-RESULTS 
<3>CTRL-EVENT-NETWORK-NOT-FOUND 
> scan_results
bssid / frequency / signal level / flags / ssid
10:fe:ed:2b:51:de	2462	-62	[WPA-PSK-CCMP][WPA2-PSK-CCMP][ESS]	wifi_fd
> add_network
0
> set_network 0 ssid "wifi_fd"
OK
> set_network 0 psk "mon_mot_de_passe"
OK
> enable_network 0
OK
<3>CTRL-EVENT-SCAN-STARTED 
> 
<3>CTRL-EVENT-SCAN-RESULTS 
<3>SME: Trying to authenticate with 10:fe:ed:2b:51:de (SSID='wifi_fd' freq=2462 MHz)
<3>Trying to associate with 10:fe:ed:2b:51:de (SSID='wifi_fd' freq=2462 MHz)
<3>Associated with 10:fe:ed:2b:51:de
<3>CTRL-EVENT-SUBNET-STATUS-UPDATE status=0
<3>CTRL-EVENT-REGDOM-CHANGE init=COUNTRY_IE type=COUNTRY alpha2=FR
<3>WPA: Key negotiation completed with 10:fe:ed:2b:51:de [PTK=CCMP GTK=CCMP]
<3>CTRL-EVENT-CONNECTED - Connection to 10:fe:ed:2b:51:de completed [id=0 id_str=]
<3>WPA: Group rekeying completed with 10:fe:ed:2b:51:de [GTK=CCMP]
> 
> save_config
OK
> quit
</code>

Ensuite on teste comme suit
<code>
[alarm@alarmpi ~]$ sudo dhcpcd wlan0
DUID 00:01:00:01:23:7b:1d:48:74:da:38:02:68:aa
wlan0: IAID 38:02:68:aa
wlan0: soliciting a DHCP lease
wlan0: soliciting an IPv6 router
wlan0: Router Advertisement from fe80::12fe:edff:fe2b:51de
wlan0: soliciting a DHCPv6 lease
wlan0: dropping DHCPv6 due to no valid routers
wlan0: offered 192.168.1.130 from 192.168.1.90
wlan0: probing address 192.168.1.130/24
wlan0: leased 192.168.1.130 for 43200 seconds
wlan0: adding route to 192.168.1.0/24
wlan0: adding default route via 192.168.1.90
forked to background, child pid 371
</code>

Ensuite créer le fichier de démarrage automatique de wpa_supplicant:
<file ini /etc/systemd/system/wpa_supp.service>
[Unit]
Description=Wifi Network
After=network.target

# Limite les re-démarrages à 5 tentatives
StartLimitIntervalSec=200
StartLimitBurst=5

[Service]
ExecStart=wpa_supplicant -P/var/run/wpasupp.pid -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf
Type=forking
PIDFile=/var/run/wpasupp.pid

# Re-essai si échec. Tempo de 30 secondes
Restart=always
RestartSec=30

[Install]
WantedBy=default.target
</file>

Ensuite créer le fichier d'appel dhcp:
<file ini /etc/systemd/system/dhcpcd_wlan0.service>
[Unit]
Description=Wifi Network
After=wpa_supp.service

StartLimitIntervalSec=200
StartLimitBurst=5

[Service]
ExecStart=/usr/bin/dhcpcd wlan0
Type=forking
PIDFile=/run/dhcpcd-wlan0.pid

Restart=always
RestartSec=30

[Install]
WantedBy=default.target
</file>