Debian 7.4 - Wifi configuration fails ... Again [closed] - configuration

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I've been installing multiple versions of ubunutu over years and now I better understand why I faced always problems with wifi configuration on these different baselines : Debian root of course.
 Issue
Now on Debian 7.4 :
The Broadcom BCM4313 driver is not loaded by default (not free product) for my wifi card. This is stated thru the UNCLAIMED declaration when looking at the network hardware status excerpt :
sudo lshw -c network
*-network UNCLAIMED
description: Network controller
product: BCM4313 802.11b/g/n Wireless LAN Controller
vendor: Broadcom Corporation
physical id: 0
bus info: pci#0000:03:00.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress cap_list
configuration: latency=0
resources: memory:f1100000-f1103fff
Unclaimed means : no driver found (no kernel association)
So I installed the driver located in the non-free backports by adding this target into the local packages repository /etc/apt/sources.list
deb http://http.debian.net/debian/ wheezy main contrib non-free
and install :
sudo apt-get update && sudo apt-get install firmware-brcm80211
sudo modprobe brcm80211
and restart
sudo shutdown now -r
Check seems OK :
sudo lshw -c network
*-network
description: Wireless interface
product: BCM4313 802.11b/g/n Wireless LAN Controller
vendor: Broadcom Corporation
physical id: 0
bus info: pci#0000:03:00.0
logical name: wlan0
version: 01
serial: 78:e4:00:4e:49:a3
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=brcmsmac driverversion=3.2.0-4-amd64 firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
resources: irq:19 memory:f1100000-f1103fff
 Network Configuration
minimal /etc/network/interfaces as required by NetworManager
auto lo
iface lo inet loopback
.. and restart
Failure
No wifi network is detected and of course I can't connect using wlan0
it doesn't work.
I found informations here regarding WPA2/PSK wifi configuration on debian :
http://www.debian.org/doc/manuals/debian-reference/ch05.en.html#_the_wireless_lan_interface_with_wpa_wpa2
so I added this setup to my interfaces file an got :
auto lo
iface lo inet loopback
allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-ssid Hznteam-Datacenter
# hexadecimal psk is encoded from a plaintext passphrase
wpa-psk 12345678901234567890123456
Same as above no wifi network detected and ifconfig gives no allocated ip address :
wlan0 Link encap:Ethernet HWaddr 78:e4:00:4e:49:a3
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
wlan0:avahi Link encap:Ethernet HWaddr 78:e4:00:4e:49:a3
inet addr:169.254.7.34 Bcast:169.254.255.255 Mask:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
Note that my required WPA2/PSK AES key length is 26 chars as requested on my other PC that connect successfully to my wifi router
Any idea ? it's boring wasting hours on the same problem again ..
Help welcome ...

Answer 1

Wrong wifi kernel module selected
I should have installed the brcmsmac module instead of the brcm80211 one. The latter is the Squeeze version kernel module. Wheezy needs the brcmsmac module as mentioned here
Althouhg the package is named brcm80211 the kernel module to load for Wheezy is brcmsmac instead of brcm80211 for the Squeeze version
more detail in this StackoverFlow post and a summary is also available here
Interfaces
I also set the /etc/network/interfaces conf file to only
$ sudo nano /etc/network/interfaces
auto lo
iface lo inet loopback
this seems to allow Network-Manager to take any discovered interfaces in account.
Everything's OK. Wifi up and running now.
.. And so much wasted time for a stupid version error !