modEM - A custom modem peripheral wrapper

• The host specifies a channel for the connection, the 2nd computer connects to it
• Ones the host recognizes a 2nd connection, it generates a random number (between 1 and 65535) and passes it to the 2nd computer.
• He then generates a random string, containing symbols and numbers, and passes that to the 2nd computer too.
• The host then closes the channel and opens a new one using the new generated number.
• The 2nd computer connects to that using the number the host gave him.

• The API passes a random number and opens a new channel on that to prevent from a 3rd party being able to listen on the connection between the 2 computers.
• Sure he can guess the channel but it'd need a while.
• It also passes a random string to the 2nd computer, because it ENCRYPTS the messages using that string.
• Which leads to a higher security if a 3rd party is listening on that channel too.

os.loadAPI("/modEM")

modEM.host(1, "top")

while true do
  print(modEM.receive())
end

os.loadAPI("/modEM")
print("opening")
modEM.open("top")
print("Connecting")
local ok, err = modEM.connect(1)

if ok == false then
  printError(tostring(err))
  return
end
local e = "hello"

while true do

  e = read()
  local ok = modEM.send(e)

  if ok == false then
	printError(tostring(err))
	return
  end
end

• Set up a modem on the top (on both computers)
• Start up the host file first
• Start up the client file
• Start writing messages on the client computer and watch them getting printed on the host
• Disconnect the client or host (for example by rebooting) and realize that you have no way of reconnecting