Trying to program an FTP

-- Open rednet and clear the terminal
rednet.open("top")
term.clear()
term.setCursorPos(1,1)
-- Inform user
print("-------------------------------")
print(" Receiving files	")
print("-------------------------------")
-- While loop to continually perform task until the file has been received
while true do

  -- Fancy loading text =3
  term.setCursorPos(17,2)
  textutils.slowPrint("...")

  -- Broadcasts a "ready" message
  rednet.broadcast("Ready for files! Waiting for a second...")

  -- Waits for initialisation prompt
  id,msg = rednet.receive(1)
  term.setCursorPos(17,2)
  print("   ")

  -- If statement to filter out possible noise
  if msg == "Sending..." then

	-- Informs user that the File Transfer has been initialised
	term.setCursorPos(1,4)
	print(" Initialised...")
	print("-------------------------------")
  
	-- Sends confirmation message in case it was not received"
	rednet.send(id,"Got the initialisation message! Now waiting...")
  
	-- Waits for file name and then prepares file
	id2,msg2 = rednet.receive()

if msg2 == "Sending..." then
   print(" Oh... got an error. Error 04")
   break
else
	  file = fs.open(msg2,"w")
	
	  -- Confirmation message
	  rednet.send(id,"Got file name...")
	
	  -- Waits for file contents
	  id3,msg3 = rednet.receive()
  
	  -- If statement to test for an intercepter
	  if id3 == id and msg3 == "TERMINATE" then
		print("TERMINATING FTP, ASSUMING ATTEMPT AT INTERCEPT")
		-- Deletes file to remove clutter
		fs.delete(msg2)
		rednet.send(id3,"FTP has been terminated by original sender.")
		break
	  else
	  
		-- If there is no intercepter (that the computer knows of), continues file transfer
		file.write(msg3)
		print("Got the file! Now ending FTP...")
		print("-------------------------------")
		break
   end
	end
  else
	-- Don't do anything, just return to the beginning of the loop.
  end
end

-- Open rednet and clear the terminal
rednet.open("top")
term.clear()
term.setCursorPos(1,1)

repeat
-- Prompt the user
print("--------------------------------------")
print(" Specify the file you want to send... ")
print("--------------------------------------")
term.setCursorPos(2,4)
file = io.read()
print("--------------------------------------")
print(" Who should this be sent to? (ID)")
print("--------------------------------------")
term.setCursorPos(2,8)
ID = io.read()
print("--------------------------------------")
textutils.slowPrint(" Sending file...")
print("--------------------------------------")

-- Make sure that ID is a number
if tonumber(ID) == nil then
  print("The ID you gave is not a number! Please be more careful, try again.")
else
  IDN = tonumber(ID)
end
until IDN

-- Loop until finished
while true do

  -- Waits for ready message
  id,msg = rednet.receive(1)

  -- Make sure the file exists
  if fs.exists(file) == true then

	-- Set variable for the file's contents
	contents = fs.open(file, "r")

	-- Filters out possible noise
	if msg == "Ready for files! Waiting for a second..." then
	  print(" Got ready message! Initialising...")
	  print("--------------------------------------")

	  -- Sends initialisation prompt
	  rednet.send(IDN,"Sending...")

	  -- Waits for confirmation message
	  id2,msg2 = rednet.receive(2)

	  if msg == "Got the initialisation message! Now waiting..." then

		-- Sends file name to recipient
		rednet.send(IDN,file)
		id3,msg3 = rednet.receive(2)

		-- Checks the message and ID
		if msg3 == "Got file name..." and id3 == IDN then

		  -- If all is good, continue and finish
		  rednet.send(IDN,contents)
		  print(" File sent!")
		  print("--------------------------------------")
		  sleep(2)
  print("Finished successfully")
  sleep(2)
  break
		elseif id2 ~= IDN then

		  -- If not all is good, send the "TERMINATE" command and finish
		  rednet.send(IDN,"TERMINATE")
		  print("TERMINATING FTP, ASSUMING ATTEMPT AT INTERCEPT")
		  sleep(2)
  print("Finished with error code 02: TERMINATE")
  break
		else
		end
	  else
		-- Do nothing
	  end
else
	 -- Do nothing
end
  else
	-- If the file doesn't exist, end program.
	print(file.." does not exist, or the wrong computer responded. =(")
sleep(2)
term.setTextColor(colors.red)
print("Finished with error code 01: File does not exist")
	break
  end
end
term.setTextColor(colors.white)