server.lua

local event = require "event"

local char_space = string.byte(" ")
local running = true
local component = require("component")
local modem = component.modem

modem.open(321)

print(modem.isOpen(321))

function unknownEvent()
	-- body
end

local myEventHandlers = setmetatable({}, { __index = function () return unknownEvent end })

function myEventHandlers.key_up(address, char, code, playername)
	if(char == char_space) then
		running = false
	end
end

function myEventHandlers.modem_message(_, reciev_addr, sender_addr, port, distance, payload)
	print("recieved something")
	print(payload)
end

function handleEvent(eventID, ...)
	if (eventID) then
		myEventHandlers[eventID](...)
	end
end

while running do
	handleEvent(event.pull())
end