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pi@raspberrypi:/etc/hostapd $ sudo hostapd -d ./hostapd.conf.O
random: Trying to read entropy from /dev/random
Configuration file: ./hostapd.conf.O
Line 14: invalid/unknown driver 'rtl1871xdrv'
1 errors found in configuration file './hostapd.conf.O'
Failed to set up interface with ./hostapd.conf.O
hostapd_init: free iface 0x16be128
Failed to initialize interface
pi@raspberrypi:/etc/hostapd $

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pi@raspberrypi:~ $ dpkg -l |grep hostap
ii  hostapd-rtl                           2.4-4                                     armhf        IEEE 802.11 AP, IEEE 802.1X/WPA/WPA2/EAP/RADIUS Authenticator
pi@raspberrypi:~ $ 

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pi@raspberrypi:/usr/src $ sudo dpkg -i hostapd-rtl_2.4-4_armhf.deb
(Reading database ... 152397 files and directories currently installed.)
Preparing to unpack hostapd-rtl_2.4-4_armhf.deb ...
Unpacking hostapd-rtl (2.4-4) over (2.4-4) ...
Setting up hostapd-rtl (2.4-4) ...
Processing triggers for systemd (215-17+deb8u4) ...
pi@raspberrypi:/usr/src $ 

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pi@raspberrypi:/etc/hostapd $ dpkg -l |grep hostap
ii  hostapd-rtl                           2.4-4                                     armhf        IEEE 802.11 AP, IEEE 802.1X/WPA/WPA2/EAP/RADIUS Authenticator
pi@raspberrypi:/etc/hostapd $

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pi@raspberrypi:~ $ sudo apt-get remove --purge hostapd
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'hostapd' is not installed, so not removed
The following package was automatically installed and is no longer required:
  libnl-route-3-200
Use 'apt-get autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 29 not upgraded.
pi@raspberrypi:~ $

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# Basic AP parameters
ssid=worky
wpa_passphrase="easypeasy"
interface=wlan0
channel=1

# WPA 2 PSK
wpa=2
auth_algs=1
wpa_key_mgmt=WPA-PSK
rsn_pairwise=CCMP

# Wifi-N
driver=rtl1871xdrv
hw_mode=g
ieee80211n=1
ieee80211d=1
country_code=FR
ieee80211h=1
# I'm sorry, I don't know if the right stanza is
# wme_ or wmm_ so I include both...
wme_enabled=1
wmm_enabled=1

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# Basic AP parameters
wpa_passphrase=easypeasy
ssid=worky
interface=wlan0
#### LATER ### bridge=br0
channel=1
country_code=FR
# From Realtek docs
max_num_sta=8

# hostapd-rtl specific driver
driver=rtl871xdrv

# WPA 2 PSK
wpa=2
auth_algs=1
wpa_key_mgmt=WPA-PSK
rsn_pairwise=CCMP

# 2.4 GHz
hw_mode=g
# Wifi-N
ieee80211n=1
# QoS support - Can't find out if it's called wme or wmm !!
wme_enabled=1
wmm_enabled=1
# Avoid crash at startup with Realtek RTL8188CUS
noscan=1
# from Realtek's docs Quick_Start_Guide_for_SoftAP.pdf and
# SoftAP_Mode_features.pdf. The [DSSS_CCK-40][MAX-AMSDU-7935]
# part comes from the interweb. Use [HT40-] or [HT40+]
ht_capab=[SHORT-GI-20][SHORT-GI-40][HT40+][DSSS_CCK-40][MAX-AMSDU-7935]

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pi@raspberrypi:~ $ wpa_passphrase worky easypeasy
network={
	ssid="worky"
	#psk="easypeasy"
	psk=6aad4c3ee371b077d2eb402ffe2428eb41021e4e8926da0e4da3d87859d48d4e
}
pi@raspberrypi:~ $ sudo nano /etc/hostapd/hostapd.conf
(delete:
wpa_passphrase=easypeasy
add:
wpa_psk=6aad4c3ee371b077d2eb402ffe2428eb41021e4e8926da0e4da3d87859d48d4e
save the file and restart the AP)

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pi@raspberrypi:~ $ brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.74da386ae783       yes             eth0
                                                        wlan0
pi@raspberrypi:~ $ ps waxu | grep hosta
pi        2745  0.0  0.4   4268  1888 pts/0    S+   17:04   0:00 grep --color=auto hosta
pi@raspberrypi:~ $ grep DAEMON_CONF /etc/default/hostapd
# Uncomment and set DAEMON_CONF to the absolute path of a hostapd configuration
#DAEMON_CONF="/etc/hostapd/hostapd.conf"
pi@raspberrypi:~ $

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# Basic AP parameters
wpa_passphrase=easypeasy
ssid=worky
interface=wlan0
bridge=br0
channel=1
country_code=GB
# From Realtek docs
max_num_sta=8
DAEMON_CONF="/etc/hostapd/hostapd.conf"
# hostapd-rtl specific driver
driver=rtl871xdrv

# WPA 2 PSK
wpa=2
auth_algs=1
wpa_key_mgmt=WPA-PSK
rsn_pairwise=CCMP

# 2.4 GHz
hw_mode=g
# Wifi-N
ieee80211n=1
# QoS support - Can't find out if it's called wme or wmm !!
wme_enabled=1
wmm_enabled=1
# Avoid crash at startup with Realtek RTL8188CUS
noscan=1
# from Realtek's docs Quick_Start_Guide_for_SoftAP.pdf and
# SoftAP_Mode_features.pdf. The [DSSS_CCK-40][MAX-AMSDU-7935]
# part comes from the interweb. Use [HT40-] or [HT40+]
ht_capab=[SHORT-GI-20][SHORT-GI-40][HT40+][DSSS_CCK-40][MAX-AMSDU-7935]

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# Basic AP parameters
ssid=worky
wpa_psk=6aad4c3ee371b077d2eb402ffe2428eb41021e4e8926da0e4da3d87859d48d4e
interface=wlan0
bridge=br0
channel=1
country_code=GB

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pi@raspberrypi:/etc/default $ brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.74da386ae783       yes             eth0
                                                        wlan0
pi@raspberrypi:/etc/default $ ps waxu | grep hosta
root     13747  0.0  0.4   2504  1796 ?        Ss   17:30   0:00 /usr/sbin/host pd -B -P /var/run/hostapd.pid /etc/hostapd/hostapd.conf
pi       15487  0.0  0.4   4268  2016 pts/0    S+   17:33   0:00 grep --color=auto hosta