1. perform default install of Debian for ARM on a Beaglebone

2. install dependencies apt-get install python-crypto python python-impacket python-pcapy libpcap0.8 bridge-utils ebtables arptables hostapd macchanger git openssh-server

3. change necessary config files to make the device stealthy enough during bootup

4. make sure autosniff.py starts on bootup

5. connect two usb ethernet dongles and reboot the device (you need two because the builtin ethernet won't support promiscuous mode)

6. perform physical ethernet cable beagle in the middle and wait for dhcp on the wireless AP

Also see apt-get command in the steps above.

python2 pycrypto python2-pcapy impacket from https://github.com/c0d3z3r0/impacket libpcap bridge-utils ebtables iptables arptables hostapd macchanger

Use the -q parameter to prevent any output originating from us. This is for sniffing-only purpose.

hostapd.conf

interface=wlan0
ssid=NothingToSeeHere
channel=1
#bridge=br0

# WPA and WPA2 configuration

macaddr_acl=0
auth_algs=3
ignore_broadcast_ssid=0
wpa=3
wpa_passphrase=hackallthethings
wpa_key_mgmt=WPA-PSK
wpa_pairwise=CCMP TKIP
rsn_pairwise=CCMP

# Hardware configuration

driver=rtl871xdrv
ieee80211n=1
hw_mode=g
device_name=RTL8192CU
manufacturer=Realtek

/etc/rc.local

cd /root/BitM/ && python autosniff.py &

ifconfig wlan0 169.254.44.44/24
ifconfig wlan0 up
udhcpd /etc/udhcpd-wlan0.conf
echo "" > /etc/resolv.conf
/etc/init.d/ssh start &

exit 0

/etc/udhcpd-wlan0.conf

start      169.254.44.50
end        169.254.44.60
interface  wlan0
max_leases 1
option subnet 255.255.255.0
option router 169.254.44.44

/etc/network/interfaces

# The loopback network interface
auto lo
iface lo inet loopback

auto wlan0
iface wlan0 inet static
address 169.254.44.44
netmask 255.255.255.0
broadcast 169.254.44.255

Update the listenaddress in /etc/ssh/sshd_config

# Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
ListenAddress 169.254.44.44

ifconfig wlan0 169.254.44.44/24
ifconfig wlan0 up
# dhcpd ...
dhcpd -4 -pf /run/dhcpd4.pid wlan0
# ... or udhcpd
udhcpd /etc/udhcpd-wlan0.conf
hostapd -B ./hostapd.conf

Just give me some credits if you build on this and keep it open source :)