How can I write an Apple Script in order to check if bluetooth and ethernet are on or off?
This can by done by involving some command-line foo:

set btStatus to do shell script "/usr/local/bin/blueutil power"
set enStatus to do shell script "ifconfig en0 | grep 'status' | cut -d ':' -f 2 | tr -d ' '"

if btStatus = "1" then
    set bluetoothEnabled to true
    log "Bluetooth is enabled"
else if btStatus = "0" then
    set bluetoothEnabled to false
    log "Bluetooth is disabled"
else
    log "Could not determine Bluetooth status"
end if

if enStatus = "active" then
    set ethernetEnabled to true
    log "Ethernet is enabled"
else if enStatus = "inactive" then
    set ethernetEnabled to false
    log "Ethernet is disabled"
else
    log "Could not determine Ethernet status"
end if


The interesting parts are the first two lines.

Please note:


This requires blueutil to be installed (you can install it easily using Homebrew)
You might need to change en0 to the interface you want to check (you can get a list of all interfaces by entering ifconfig into a terminal)
You might need to change the path to blueutil (depending how you installed it)