Connect to your Android device according to this manual:
http://developer.android.com/tools/device.html
Issue following commands:
adb shell
netcfg (deprecated, use ip link show or ifconfig instead)

It gives you output similar to following:
lo       UP                                   127.0.0.1/8   0x00000049 00:00:00:00:00:00
usb0 DOWN 0.0.0.0/0 0x00001002 66:f7:3e:fc:88:d3
sit0 DOWN 0.0.0.0/0 0x00000080 00:00:00:00:00:00
ip6tnl0 DOWN 0.0.0.0/0 0x00000080 00:00:00:00:00:00
rmnet0 DOWN 0.0.0.0/0 0x00001082 fa:2f:d1:49:37:fd
rmnet1 DOWN 0.0.0.0/0 0x00001082 62:31:e3:93:3d:a0
rmnet2 DOWN 0.0.0.0/0 0x00001082 ba:2a:1c:03:ec:68
p2p0 DOWN 0.0.0.0/0 0x00001002 42:b0:fa:82:17:46
wlan0    DOWN                                   0.0.0.0/0   0x00001002 40:b0:fa:82:17:46

Use MAC address of usb0 or wlan0 as HWID.

To get the MAC address for WLAN, you need to enable WiFi on the device.

You can also find MAC address using graphical interface - in settings of the device (this is device specific so you will have to search little bit).

Remark:

Some Android versions offer two different ways to get MAC address and only one is correct. You can find information about the MAC address you need to generate license in Settings->About Phone. 

Don't use the MAC address from Settings->Wi-Fi->Wi-Fi Preferences.