ComputerCraft Wifi iPad

print("Wi-fi modem side? (back/top/left/right/bottom)")
modemSide = read()

rednet.open(modemSide)

if (rednet.isOpen(modemSide)) then
print("[OK] Wi-fi activated")

rednet.broadcast("Who is online?", "loaders")

senderId, message, protocol = rednet.receive()
print(tostring(senderId), " is online.")

rednet.broadcast("Who is online?", "unloaders")

senderId, message, protocol = rednet.receive("unLoadersOnlineResult")
print(tostring(senderID), " is online.")

else
print("Wi-fi activation error. Maybe wrong side?")
return false
end